ISMAT: YOUR TRUSTED INDIAN O-RING PARTNER

Introduction

O-rings are essential sealing component that are used in industrial applications or equipment, to prevent leakage of fluids and gases. These O-rings or seals are designed to be used in various applications, from agriculture to food and beverage industries. It is a necessary soft sealing component that gives you safety while being cost-effective, budget-friendly and prevents damages caused by leakages.

O-rings and other seals are designed in various dimensions based on equipment sizes. These are designed to offer durability against extreme temperatures, pressure, and aggressive chemicals.

Designing Custom O – Rings for specialized applications

 ISMAT produces O-rings designed specifically to meet the unique needs of your equipment, carefully tailored to precise dimensions and sizes. A rigorous process is followed to ensure the highest quality in delivering O-rings and seals for a wide range of applications.

There are several important aspects that contribute to the performance and effectiveness of O-rings. Key factors such as material selection, design aspects, prototyping, testing, and validation are crucial in preventing unnecessary leakages.

The process involves several essential steps to ensure optimal performance of industrial applications.

1. Material Selection: The right materials are chosen based on specific environments, ensuring durability and resistance to pressure, temperature, and chemicals.
2. Design Considerations: O-rings are designed to perfectly fit your equipment, preventing unnecessary leakages and enhancing overall performance.
3. Prototyping and Testing: Prototypes are created and rigorously tested to ensure that they meet the required O-ring specifications and perform as expected.
4. Validation:Every product undergoes thorough validation to guarantee it meets the high standards you expect from ISMAT.

This detailed process ensures that O-rings or seals meet your requirements and deliver reliable results, providing high-quality solutions worldwide.

O-Ring Sizing and Measurement Techniques

The key features of ISMAT ensure that O-rings and seals provide the best possible safety for your equipment. Tools like calipers, Pi-tape, O-ring cones, and gauges to measure the inner diameter accurately and outside diameter, as well as cross-sectional dimensions, ensure a perfect fit for your specific needs.

For improved sealing performance, there are a few practical tips to consider from industry experts.

• Always clean the tools before and after
• Avoid stretching O-rings during measurement.
• Conduct multiple trials for accuracy.
• Work in well-lit conditions to ensure precise readings.

The O-ring material guide assists in selecting the best material for specific applications. For convenience, refer to Metric O-ring sizes and AS568 O-ring sizes to find the right fit.

As a reliable O-ring supplier, ISMAT offers high-quality products and expert advice to meet diverse needs.

O-Rings in Extreme Environments: Performance and Material Selection

ISMAT produces O-rings or seals for various critical needs and requirements, where extreme temperatures, pressures, and chemically aggressive environments can significantly impact their performance.

1. Temperature Extremes:

• High Temperatures: O-Rings can degrade under high temperatures, leading to hardening, loss of elasticity, and eventual failure. Materials like Perfluoroelastomers (FFKM) are often preferred for high-temperature applications, capable of withstanding temperatures up to 315°C and even higher in some cases.

•   Low Temperatures: At low temperatures, many elastomers can become brittle, compromising their sealing capability. Fluroelastomers (FKM) and Hydrogenated Nitrile (HNBR) perform better at lower temperatures, with some grades suitable for applications as low as -50°C. Flurosilicone (FVMQ) performs better at extremely low temperatures suitable for applications as low as -65°C.

2. High Pressures:

In high-pressure environments, O-Rings must maintain their sealing integrity without extruding or deforming. The choice of Material grades,cross-sectional diameter and material hardness plays a critical role. Harder materials, like FKM, HNBR, often provide better resistance to extrusion, while larger cross-sections can help resist pressure-induced deformation.

3. Chemical Resistance:

Chemically aggressive environments pose a significant challenge. O-Rings must be compatible with various fluids, gases, and chemicals. Fluoroelastomers (FEPM) and Perfluoroelastomers (FFKM) are generally resistant to many chemicals, making them suitable for petroleum products, fuels, Amines and solvents. However, they may not be suitable for steam or certain acids, where alternatives like Ethylene Propylene Diene Monomer (EPDM) might be more effective. Check out our Chemical compatibility chart for more details

Key Standards and Certifications for O-Rings

A commitment to delivering high-quality O-rings or seals is shown by adhering to key industrial standards and maintaining certifications, reflecting a focus on quality and authenticity.

1. ISO 3601 Standard

2. ASTM D2000 Standard

3. AS568 Standard

4. FDA Approval

5. NSF Certification

6. UL Recognition

7. AMS Specifications

8. Mil-Spec Standards

Adherence to international standards and certifications ensures alignment with global industry requirements, providing reliability and credibility for customers.

Adhering to these global guidelines guarantees precise O-ring specifications, including accurate O-ring diameters, ensuring they meet a variety of application requirements.

The Role of Lubricants in O-Ring Assembly

O-rings are crucial in applications like valves, which provide effective seals and prevent leakage. Proper lubrication is essential for reducing friction, avoiding damage, and maintaining seal integrity, which extends the lifespan of the O-rings.

Compatibility with O-ring specifications is key when selecting lubricants, as the wrong choice can cause swelling or degradation. Silicone-based lubricants offer thermal stability, while petroleum-based and specialized greases can be used cautiously depending on the material. Water-based lubricants are ideal for contamination-sensitive environments, and PTFE lubricants reduce friction effectively.

Conclusion

O-rings must be properly lubricated, which is essential for maintaining seal integrity and safety across various applications, including the oil and gas industry, energy sector, food and beverage industry, chemical industry, mining industry, agriculture sector, and aerospace industry.

ISMAT understands the needs of these domains and produces high-quality O-rings and seals that meet the unique requirements of each industry. As a leading manufacturer & exporter of O-rings in India, ISMAT ensures compliance with the highest standards of safety and durability.

With a team of experts and an unwavering focus on quality, ISMAT not only supports the integrity of your applications but also reinforces its reputation as a premium supplier in the global market.

To explore more about O-rings and seals and their requirements in various applications, please visit our website

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Discover the High – Performance of PTFE products from ISMAT

PTFE (Polytetrafluoroethylene) is a versatile material known for its wide range of properties, making it significant in various industries. PTFE is used in numerous products, from non-stick cookware to critical components in aerospace and electronics, as it is known for its chemical resistance and self-lubricating properties. Recognizing its high demand, ISMAT, a high-performance seal manufacturer in Chennai, offers 20 different grades in their NOVUM series, tailored to meet diverse industrial needs.

High-quality PTFE Seal Manufacturer in Chennai for Diverse Industries

What is PTFE?

PTFE Or Polytetrafluoroethylene stands resilient in high-temperature environments without degrading. Additionally, its self-lubricating characteristics make it a perfect match for non-stick cookware.

PTFE Applications

ISMAT produces high-performance PTFE sealing products for key industries, including Oil and Gas, Chemical Processing, Aerospace, and the Energy Sector.

Industrial PTFE Seals – A Critical Component in the Oil and Gas Industry

Gaskets: Industrial PTFE gaskets are predominantly used in the Oil and Gas industry. PTFE offers high-temperature stability and chemical resistance. It also ensures safety and efficient operation under extreme conditions.

Seals: PTFE seals are used to prevent leakage in pumps and valves, maintaining system integrity.

Linings: PTFE linings protect equipment from corrosive substances, significantly extending the lifespan of the products.

High-Performance PTFE Sealing Solutions for Chemical Processing Industries

PTFE is an ideal material for gaskets and seals in the chemical processing industry, known for its superior properties:

PTFE Gasket Supplier: ISMAT delivers PTFE gaskets that are crucial in chemical processing, providing reliability for sealing applications in highly reactive environments.

Chemical Tank Linings: PTFE linings prevent chemical contamination, thereby protecting both the tanks and their contents.

Seals and Gaskets: These seals and gaskets are specifically designed to prevent leaks, ensuring consistent equipment performance.

Piping Systems: PTFE-coated pipes from ISMAT resist chemical wear and tear, enhancing the durability and safety of chemical processing systems.

PTFE Sealing Solution – Reliability in Aerospace and Automotive Industry

ISMAT also provides affordable PTFE seals for the automotive industry, demonstrating versatility across sectors. In aerospace, it performs several critical functions:

Insulation: It is used in insulation materials for wiring and cables, ensuring safe operations in high-temperature environments.

Seals: The seals prevent leaks in aircraft engines and fuel systems, contributing to optimal performance and safety.

Gaskets: It maintains the integrity and performance of high-pressure aerospace components.

PTFE Sealing Solution for the Energy Sector

In the energy sector, PTFE sealing solutions offer durability and resistance to high temperatures and chemical reactions:

Seals and Gaskets: PTFE seals and gaskets are employed in turbines and other energy equipment to prevent leaks and withstand high pressures.

Insulation: It provides excellent insulation in high-voltage applications, protecting both equipment and personnel.

Coatings: PTFE coatings offer high-quality protection in the energy sector, offering excellent resistance to harsh chemicals and extreme temperatures, ensuring the longevity and efficiency of equipment.

Durable and High-Quality PTFE Seal Manufacturer Grades

ISMAT is a high-performance seal manufacturer in Chennai, producing 20 different NOVUM Series PTFE grades that vary in chemical resistance, temperature & pressure, friction, and ideal application:

Virgin PTFE: This type of PTFE is the benchmark for excellent chemical resistance and flexibility. This material is widely used in electrical insulators, chemical tank linings, and gaskets.

RPTFE: RPTFE demands extra durability and handles various chemical reactions with ease. This type of PTFE is suitable for applications involving friction, standing out in wear and tear. It is majorly used in the food industry.

Glass-Filled PTFE: ISMAT also produces glass-filled PTFE, which excels in chemical resistance, temperature range, and electrical insulation. Based on these properties, it is used for valve seats, bushings, and bearings.

Carbon-Filled PTFE: High in thermal conductivity and good at mechanical strength, ISMAT produces carbon-filled PTFE for bearings and components under high load.

Steel-Reinforced PTFE: Produced for high-abrasion environments, ISMAT offers high-quality PTFE seals for the food industry using steel-reinforced PTFE.

Bronze-Filled PTFE: Our bronze-filled PTFE is a wise choice for the best and most affordable seal manufacturer in the aerospace industry.

PTFE Products from High- Performance Seal Manufacturers

We are a high-quality supplier of FDA-approved PTFE seals, offering top-notch seal supplies to the industry.  Here are some of our products widely used in various sectors. The products are:

1. Valve Seat
2. Stem Seals
3. Gaskets
4. Chevron Packing
5. PTFE O – Rings

Conclusion

In summary, PTFE is a highly versatile material that stands out for its chemical resistance, temperature stability, and durability. With ISMAT’s top-quality PTFE products, you can trust in reliable performance and superior protection in your office and home environments. Based on customer needs, we also customize PTFE seals for various industrial applications to satisfy different domains.

We deliver high-quality, customised PTFE seals to meet your needs. ISMAT always provides superior quality and better performance to maintain your product’s quality for a lifetime.

Continue reading “Discover the High – Performance of PTFE products from ISMAT”

Here are 5 Essential Steps to Installing an O-Ring

Step 1: Choose the Right O-Ring

The initial step in O-ring installation involves ensuring that you have the right ring for the job. O-rings are available in a diverse array of sizes, materials, and hardness, with each type tailored to a specific application. Whether you require standard O-rings, miniature O-rings, or custom O-rings, here’s the essential information to consider when selecting the most suitable fit:

• Size: Using the right O-ring size for each assembly is critical. If it’s too small, the O-ring could tear or break. Alternatively, if an O-ring is too large, it won’t provide adequate sealing, making it essential to find the just-right-sized option for your application. O-ring sizing is often measured by its inner diameter (ID), outer diameter (OD), and cross-sectional diameter (CS). 
• Material: Each O-ring material has different properties that make it better suited for certain conditions, such as the temperature, fluid compatibility, and other conditions the seal will encounter. A few of the most common compounds include nitrile (buna n), ethylene propylene (EPDM), fluoroelastomer (FKM, Viton®), Neoprene®, silicone, perfluoroelastomer (FFKM O-ring), polyurethane, and aflas.
• Hardness: The hardness of the O-ring is another factor to consider when choosing the right fit for your application. Hardness represents resistance to compression and abrasion and is measured in durometer units. Most O-rings can be molded in a wide range of compounds in hardnesses from 40 to 95 Shore A.

Step 2: Clean the O-Ring and Surfaces

• After selecting the appropriate O-ring based on its size, material, and hardness, it becomes crucial to clean both the O-ring and the surfaces between which it will be installed. Any dirt, dust, or other contaminants can potentially lead to O-ring leaks or failure. A comprehensive cleaning process, typically involving a clean cloth and a basic solution of soap and water, is often adequate. However, depending on the specific conditions, you may find it necessary to utilize a more specialized cleaning solution.

Step 3: Lubricate the O-Ring

In most cases, you must apply lubricant before installing the O-ring. Lubricating the O-ring facilitates easier installation and reduces the risk of elastomer damage from tearing, twisting, pinching, cutting, and abrasions. Applying a thin film of lubrication to fill any gaps or spaces between the O-ring and the mated part helps the ring slide smoothly. Additionally, lubricant decreases the surface tension between the surfaces, allowing for a tighter fit. It’s important to note that when install an O-ring on a standard female gland, lubricant should be applied after positioning the O-ring.

The choice of lubricant depends on factors such as material, system fluid compatibility, and service temperature. 

Step 4: Install the O-Ring

Now, let’s proceed with the O-ring installation. Start by placing the ring in the groove between the two surfaces, ensuring proper centering and alignment at both ends. Subsequently, carefully stretch the O-ring evenly over the surface, being mindful to avoid pulling from either side, twisting, or causing any damage. Exercise caution during stretching to prevent overstretching the O-ring beyond its maximum elongation, as this could result in breakage and tearing during assembly or use.

Once the O-ring is positioned, use a flat tool to press it into the groove until it is fully seated. If the installation is in a confined space, a tool with a smaller profile, such as a flat screwdriver, may be necessary to carefully position it. Instead of rolling, slide the O-ring down the shaft to prevent spiraling, thereby reducing the risk of leaks and contamination in the final assembly.

When dealing with O-rings paired with threaded parts, gently guide the O-rings over the threads to avoid tearing. To provide additional protection for the O-ring and threads, consider using lubricant and covering the threads with masking tape as a precautionary measure.

Step 5: Check the Installation

After installing the O-ring, make sure to seat it properly and check for leaks. For example, when installing an O-ring in a hydraulic system, run the system and inspect for leaks using UV dye. However, if you are installing an O-ring in another system, you might need to perform a different leak test.

O-Ring Installation Tips for Success

• Avoid forcing O-rings over sharp corners and jagged features. This can cause tiny tears that may not be visible but can compromise the seal’s performance.
• Follow ISMAT’s O-ring storage and cleaning recommendations to prevent damage and promote the best results.

O-rings can fail for various reasons, typically related to environmental conditions, material properties, installation issues, or operational stresses. Here are some common types of O-ring failures and their causes:

1. Compression Set

• Description: The O-ring becomes permanently deformed and fails to return to its original shape after being compressed. The cross-section of the O-ring becomes less circular and may take the shape of the groove/gland.
• Causes:
  • Excessive temperature exposure
  • Long-term static load
  • Improper material selection

2. Extrusion and Nibbling

• Description: Portions of the O-ring material are forced into the clearance gap between the mating surfaces, leading to nibbling or tearing. The edges of the O-ring will have a chipped or nibbled appearance. 
• Causes:
  • High pressure
  • Large clearance gaps
  • Inadequate material hardness

3. Abrasion

• Description: The surface of the O-ring wears away due to friction against mating surfaces. The sliding surface of the O-ring will have lacerations and a grazed finish.
• Causes:
  • Rough or poorly finished surfaces
  • Inadequate lubrication
  • Movement between the O-ring and sealing surfaces

4. Chemical Degradation

• Description: The O-ring material deteriorates due to exposure to incompatible chemicals. The O-ring may exhibit a number of blisters, cracks and discolouration due to chemical attack.
• Causes:
  • Contact with aggressive chemicals
  • Use of unsuitable O-ring material for the chemical environment

5. Thermal Degradation

• Description: The O-ring material degrades due to exposure to excessive heat or cold.
• Causes:
  • Operating beyond the temperature limits of the material
  • Inadequate heat dissipation

6. Explosive Decompression

• Description: Rapid gas decompression causes trapped gas within the O-ring to expand, leading to blistering or rupturing.
• Causes:
  • Rapid pressure changes
  • High-pressure gas environments

Explosive decompression (ED) is a specific failure mode for O-rings that occur when they are exposed to high-pressure gas environments followed by a rapid decrease in pressure. This can cause the gas absorbed or trapped within the O-ring material to rapidly expand, potentially leading to blistering, cracking, or rupturing of the O-ring. Here are details on this type of failure and how to mitigate it:

Mechanism of Explosive Decompression Failure

1. High-Pressure Gas Exposure: The O-ring is exposed to a high-pressure gas environment. Gases can permeate the O-ring material during this period.
2. Rapid Pressure Drop: When the external pressure is rapidly reduced, the gas trapped inside the O-ring attempts to escape quickly.
3. Internal Stresses: The rapid expansion of gas within the O-ring creates internal stresses that can lead to blistering, cracking, or rupture.

Symptoms of Explosive Decompression Failure

• Blistering: Visible blisters or bubbles on the surface of the O-ring.
• Cracking: Radial or circumferential cracks in the O-ring material.
• Rupturing: Complete breakage or tearing of the O-ring.
• Swelling: Noticeable swelling or deformation of the O-ring.

Causes

• Rapid Depressurization: The primary cause is a rapid decrease in external pressure.
• Material Permeability: Materials with high gas permeability are more susceptible to ED.
• High-Pressure Gas: Certain gasses, such as nitrogen or carbon dioxide, can exacerbate the problem.

Mitigation Strategies

1. Material Selection:
   1. Use ED-resistant materials. Fluorocarbon (FKM), Hydrogenated Nitrile Butadiene Rubber (HNBR), and perfluoroelastomers are known to have better resistance to explosive decompression.
2. Design Considerations:
   1. Minimize the rate of pressure drop if possible to allow the gas to escape gradually.
   2. Ensure proper groove design to avoid trapping gas.
3. Preconditioning:
   1. Precondition O-rings in the high-pressure environment before operation to reduce the amount of gas absorbed.
4. Surface Treatments:
   1. Apply surface treatments or coatings that reduce gas permeability.
5. Regular Inspection and Maintenance:
   1. Regularly inspect O-rings for signs of ED damage and replace them as needed.
6. Pressure Management:
   1. Implement controlled decompression procedures to reduce the risk of rapid pressure drops.

7. Installation Damage

• Description: The O-ring is damaged during installation, leading to cuts, nicks, or overstretching.
• Causes:
  • Improper installation techniques
  • Sharp edges or burrs in the groove or mating surfaces

8. Over compression

• Description: Excessive compression of the O-ring leads to flattening and material extrusion.
• Causes:
  • Incorrect groove design
  • Excessive tightening of mating surfaces

9. Weather and Ozone Cracking

• Description: The O-ring surface cracks due to exposure to ozone or ultraviolet (UV) light. The earliest signs of this type of O-ring failure begins with discolouration leading to subsequent cracking. 
• Causes:
  • Outdoor or high-ozone environments
  • Use of materials not resistant to ozone or UV light

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10. Swelling

• Description: The O-ring swells excessively, altering its dimensions and leading to seal failure. The O-ring may swell or increase from its original dimension consistently across the seal or in localized areas.
• Causes:
  • Absorption of fluids
  • Incompatible material with the sealing environment

11. Spiral Failure

• Description: The O-ring twists in its groove and develops spiral cuts or cracks. The O-ring will have a spiraling pattern around its exterior, with deep cuts at 45° angles where the highest stress levels are apparent.
• Causes:
  • Dynamic applications with reciprocating motion
  • Improper O-ring lubrication
  • Misalignment

If you are facing such O-ring failures, contact ISMAT to help find a solution for them. Our team of engineers will help you identify the right material to use with aggressive chemicals and harsh environments. They are also trained to study gland designs and suggest the accurate O-ring dimensions to use. You can also check out our O-ring Installation Guide that can help you in reducing O-ring failures. 

 

What is Sealing?

A seal is a device used to prevent the leakage of fluids or gasses between two surfaces. Seals are designed to create a barrier between two parts of a machine or system to prevent the escape of fluids or gasses, or to prevent the entry of contaminants into the system. 

Understanding the Types of Mechanical Soft Seals in Trunnion Mounted Ball Valves

Trunnion Mounted Ball Valves (TMBVs) are critical components in various industries like Oil & Gas and Pharmaceutics, due to their ability to control high-pressure and high-flow applications. These valves rely on a variety of soft seals to ensure optimal performance and leak prevention. In this blog, we will explore the different types of mechanical soft seals used in TMBVs, focusing on O-rings, backup rings, valve seats, seat rings and Valve Packings for static applications, and quad rings for dynamic applications. We will delve into their functions, the materials they are made from, and their specific roles within a TMBV.

1. O-Rings

Description

O-rings are circular elastomeric rings that create a seal at the interface of two or more parts. When installed, they deform under pressure to effectively seal gaps and mating components. After deflection, O-rings revert to their original shape, maintaining a sealed condition. They are one of the most common types of seals used in various mechanical applications, including TMBVs.

Reasons for Use

O-rings provide an effective and reliable seal with simple design requirements. They are versatile, cost-effective, and easy to install and maintain.

Materials

• Perfluoro elastomer: Excellent resistance to aggressive chemicals such as, hot organic and inorganic acids, caustics, amines especially hot amines >70°C, ketones, aldehydes, esters, ethers, alcohols, fuels, solvents, sour gases, hot water, steam, ethylene propylene oxide and mixed process streams.
• HNBR Rubber (HNBR): Excellent resistance to oils, vegetable oils, greases, glycol based coolants, hydrocarbon oils and sour gases.
• Fluorocarbon (Viton): Excellent resistance to chemicals, hydrocarbon oils, sour gases, steam and high temperature resistance upto 200°C.
• Aflas (FEPM): Good for water and steam applications.
• Fluorosilicone: Excellent resistance to heat, chemical degradation, high tensile and tear strength compared to silicone, excellent low temperature flexibility.

Application in TMBVs

O-rings can be used in both static and dynamic applications:

1. Static Seals: These do not move except for pulsation caused by cycle pressure. Examples include axial, radial, dovetail, and boss seals

• Axial: Squeezed axially in the groove like a flat gasket.
• Radial: Squeezed radially between the inside (ID) and outside (OD) of the groove.
• Dovetail: Retained in the face seal during assembly and maintenance.
• Bosstail: Used for sealing straight thread tube fittings in a boss.

1. Dynamic Seals: Sit inside a groove between rotating surfaces, providing a leak-tight seal.

In TMBVs, O-rings are commonly used in static applications to seal the valve body, ensuring that no fluid leaks between the valve components. They are placed in the grooves of the Seat Ring and are compressed to form a tight seal.

2. Backup Rings

Description

Backup rings are ring-shaped components made from rigid materials that support O-rings or other seals to prevent extrusion and deformation under high pressure. The two main types of Backup Rings are: 

• Scarf Cut Backup Ring
• Solid Backup Ring
• Spiral Backup Ring
• Contoured Rubber Backup Ring

Reasons for Use

Backup rings enhance the performance of O-rings by providing structural support, especially in high-pressure applications. They help maintain the integrity of the seal by preventing extrusion into the clearance gaps.

Materials

• Polytetrafluoroethylene (PTFE): High chemical resistance and low friction.
• Reinforced PTFE (RPTFE): Enhanced mechanical strength and wear resistance.
• Peek: High temperature and chemical resistance with excellent mechanical properties.
• Fluorocarbon (FKM) : High chemical and temperature resistance.

Application in TMBVs

Backup rings are used in conjunction with O-rings in static applications. They are typically placed on the low-pressure side of the O-ring, providing additional support to maintain a reliable seal.

3. Valve Seats

Description

The ball valve seats are critical surfaces responsible for sealing the fluid inside and uniformly distributing the seating stress. In soft seat ball valve designs, either an elastomer or polymer is used as the seal and is inserted into a metallic seat ring. Valve seats interface with the ball and are responsible for stopping the flow of fluid when the valve is closed.

Reasons for Use

Valve seats provide a primary sealing function within TMBVs, ensuring a tight shut-off and preventing fluid leakage. They must withstand the mechanical stress and wear associated with valve operation.

Materials

• PTFE: Offers excellent chemical resistance and low friction.
• Reinforced PTFE (RPTFE): Enhanced mechanical strength and wear resistance.
• Peek: High temperature and chemical resistance with excellent mechanical properties.

Application in TMBVs

Valve seats are located around the ball in the valve body. When the valve is closed, the ball compresses against the seats, creating a tight seal that stops the fluid flow.

4. Seat Rings

Description

The primary function of a ball valve seat ring is to provide a sealing surface against which the ball (the spherical closure element) can press to stop fluid flow. When the ball valve is in the closed position, the seat ring ensures that there is no leakage by creating a tight seal. In the open position, the seat ring ensures minimal resistance to fluid flow. This dual role is vital for the proper functioning of the valve, ensuring both effective shutoff and smooth operation.

Reasons for Use

It forms an essential part of the sealing mechanism that ensures the valve can shut off fluid flow effectively and maintain a tight seal under various operating conditions.

Materials

The choice of material for seat rings depends on the application requirements, including pressure, temperature, and the nature of the fluid being handled. Common materials include:

1. PTFE (Polytetrafluoroethylene): Known for its excellent chemical resistance, low friction, and high temperature tolerance, PTFE is a popular choice for seat rings in chemical and pharmaceutical industries.
2. Reinforced PTFE (RPTFE): This is PTFE combined with fillers like glass or carbon to enhance its mechanical strength and wear resistance. RPTFE is used in more demanding applications.
3. Peek (Polyether Ether Ketone): PEEK offers high temperature and chemical resistance with excellent mechanical properties, making it suitable for high-performance applications.
4. Elastomers (e.g., Nitrile Rubber, EPDM): For applications involving lower temperatures and pressures, elastomers provide good flexibility and sealing performance.
5. Metal: In some high-pressure or high-temperature applications, metal seat rings are used for their strength and durability. Metal seats can be overlaid with softer materials to improve sealing performance.

Application in TMBVs

In ball valves, seat rings are positioned in the valve body and form a seal with the ball. When selecting seat rings for a ball valve, several factors must be considered:

1. Fluid Compatibility: The material must be compatible with the fluid being handled to prevent degradation or chemical attack.
2. Temperature and Pressure: The seat ring material must withstand the operating temperature and pressure conditions without deforming or failing.
3. Mechanical Wear: Materials should have good wear resistance to ensure long service life, especially in applications involving frequent cycling.
4. Regulatory Requirements: In certain industries, seat ring materials must comply with regulatory standards, such as FDA regulations for food and pharmaceutical applications.

5. Quad Rings

Description

Quad rings, also known as X-rings, are four-lobed seals that provide a more stable seal compared to standard O-rings. They are designed to resist rolling or twisting in dynamic applications.

Reasons for Use

Quad rings offer improved sealing performance in dynamic applications due to their unique design, which provides multiple sealing surfaces and reduces friction. They also have better resistance to twisting and extrusion.

Materials

• Nitrile Rubber (NBR): Suitable for oil and fuel resistance.
• Fluorocarbon (Viton): High chemical and temperature resistance.
• EPDM: Suitable for water and steam applications.

Application in TMBVs

In TMBVs, quad rings are used in dynamic applications such as stem seals or shaft seals. They provide reliable sealing under the movement of the valve stem or shaft, ensuring no leakage during valve operation.

Conclusion

Trunnion Mounted Ball Valves rely on a variety of mechanical soft seals to ensure optimal performance and reliability. O-rings, backup rings, valve seats, seat rings, and quad rings each play crucial roles in maintaining a leak-free environment within the valve. The choice of materials for these seals depends on the specific application requirements, including pressure, temperature, and chemical exposure. By understanding the functions and applications of these soft seals, we can appreciate the complexity and precision involved in designing high-performance sealing solutions for TMBVs.

 

Rubber Gaskets are mechanical seals that are made from elastomeric materials with a flat surface area. They are designed to fill the space between two or more mating surfaces. They are typically used in static applications. They are used to prevent fluids from leaking out, under various operating conditions, while also blocking contaminants from entering the system. Rubber gaskets are essential components in numerous applications, providing reliable sealing solutions in a wide range of industries.

Applications of Rubber Gaskets as Sealing Solutions

Rubber gaskets are used extensively as sealing solutions due to their flexibility, resilience, and ability to withstand different environmental conditions. Here are some key industries where rubber gaskets are crucial:

1. Automotive Industry: Rubber gaskets are used in engines, transmissions, and exhaust systems to prevent oil, coolant, and gas leaks. They are also found in doors and windows to provide weatherproof seals. They are used in places that require a low-pressure seal for passive components. 
2. Aerospace Industry: In aerospace applications, rubber gaskets are used to seal aircraft windows, doors, and fuel systems, propellants and oxidizer systems – ensuring safety and performance at high altitudes and varying pressures.
3. Oil and Gas Industry: Rubber gaskets are employed in pipelines, valves, and flanges to prevent leakage of oil and gas under high pressure and temperature conditions.
4. Chemical Industry: These gaskets are used in chemical processing equipment to prevent leakage of hazardous chemicals and ensure the integrity of the system.
5. Food and Beverage Industry: Rubber gaskets are used in food processing and packaging machinery to prevent contamination and maintain hygiene standards.
6. Pharmaceutical Industry: In pharmaceutical manufacturing, rubber gaskets ensure the purity of products by preventing contamination during processing and packaging.
7. Plumbing Applications: EPDM and Nitrile gaskets are used in plumbing systems to ensure leak-free connections. Rubber gaskets are a good choice in water utility and plumbing applications because they are affordable and are resistant to corrosion, water and chlorides. 

Materials Used in Manufacturing Rubber Gaskets

Rubber gaskets are made from various elastomeric materials, each chosen for its specific properties and suitability for different applications. Common materials include:

1. 1. Natural Rubber (NR): Natural Rubber Gaskets possess good tear, abrasion and shear resistance. 
   2. Nitrile Rubber (NBR): Nitrile rubber offers excellent resistance to oils, fuels, and other chemicals, making it ideal for automotive and industrial applications.

• Chloroprene (CR): Chloroprene gaskets are resistant to high aniline point oils, petroleum solvents and harsh climates and conditions. It has good mechanical properties over a wide temperature range from -40 deg C to 121 deg C.

1. Silicone Rubber: Silicone gaskets can withstand high temperatures and are used in applications requiring thermal stability and resistance to UV and ozone. It is mainly used in the automotive, medical and food industry. 
2. Ethylene Propylene Diene Monomer (EPDM): EPDM rubber is resistant to weathering, ozone, and water, making it suitable for outdoor and automotive applications.
3. FKM (Viton): Viton gaskets are highly resistant to chemicals, heat, and oil, commonly used in chemical processing and aerospace industries.
4. PTFE (Teflon): PTFE Gaskets or more commonly known as Teflon gaskets possess outstanding chemical resistance. Since PTFE is hydrophobic and possesses a low coefficient of friction, Teflon gaskets are used for their non-stick properties. PTFE gaskets are also widely used against corrosive environments.

Types of Rubber Gaskets

Rubber gaskets come in various types, each designed for specific sealing requirements:

1. Full-Face or Flat-Face Gaskets: These gaskets cover the entire flange surface and are used in applications where a complete seal is necessary. It is commonly used in applications requiring a broad sealing area to prevent leakage and withstand higher pressures.
2. Ring Type Joint Gaskets: Ring gaskets, also known as ring-type joints (RTJs), are used in high-pressure applications. They fit into a groove on the flange face.
3. Spiral Wound Gaskets: These gaskets consist of a mixture of metal and filler material wound in a spiral shape. They are used in high-pressure and high-temperature applications.
4. Envelope Gaskets: These gaskets combine the low friction and chemical stability of PTFE with the mechanical strength of the inner rubber material. These gaskets are widely used in the Food & Beverage Industry as well as the Pharmaceutical and chemical industry. PTFE envelope gaskets can be removed easily and quickly without residue from the flange faces and new gaskets can be installed in no time.

Selection Criteria for Rubber Gaskets

Selecting the right rubber gasket for a specific application involves considering various factors to ensure optimal performance and longevity. The following criteria are essential when choosing a rubber gasket:

1. Operating Environment

• Temperature: Determine the maximum and minimum temperatures the gasket will be exposed to. Different materials have varying temperature resistance.
• Pressure: Assess the pressure conditions. High-pressure applications might require more robust gaskets like spiral wound or ring gaskets.
• Chemical Exposure: Identify the chemicals the gasket will come into contact with. Materials like PTFE or FKM are suitable for highly corrosive environments.

2. Material Compatibility

• Rubber Type: Select the rubber type based on its chemical and physical properties. For example, Nitrile rubber (NBR) is excellent for oil resistance, while EPDM is suitable for weather and ozone resistance.
• PTFE and Teflon: These materials offer excellent chemical resistance and are used in highly corrosive environments.

3. Mechanical Properties

• Hardness: Measured in Shore A, hardness affects the gasket’s ability to compress and seal under pressure. Applications requiring flexibility might need softer gaskets.
• Tensile Strength: Important for applications subjected to stretching or pulling forces.
• Compression Set: The gasket’s ability to return to its original thickness after being compressed. A low compression set is desirable for maintaining a good seal over time.

4. Design and Dimensions

• Size and Shape: Ensure the gasket dimensions match the flange or mating surfaces. Custom shapes may be required for specific applications.
• Thickness: The thickness of the gasket can affect its sealing ability. Thicker gaskets can fill larger gaps but may require more compression force.

5. Application-Specific Requirements

• Food and Pharmaceutical: Gaskets used in these industries need to comply with regulatory standards such as FDA approvals for food-grade materials.
• Outdoor Exposure: Applications exposed to weather elements should use materials resistant to UV, ozone, and other environmental factors.
• Electrical Insulation: In applications where electrical insulation is necessary, materials like silicone rubber may be preferred.

6. Cost and Availability

• Budget: Consider the cost of the gasket material and its lifespan. Sometimes a more expensive material can offer better performance and longevity, reducing overall costs.
• Availability: Ensure the selected gasket material is readily available to avoid delays in manufacturing or maintenance.

Summary of Rubber Gasket Applications

Rubber gaskets are versatile and find applications across various industries:

• Automotive and Aerospace: Used in engines, transmissions, fuel systems, and as weatherproof seals in doors and windows.
• Oil and Gas: Essential for sealing pipelines, valves, and flanges to prevent leaks and ensure safety.
• Chemical Processing: Used to seal reactors, pumps, and valves, ensuring no leakage of hazardous substances.
• Food and Beverage: Ensuring contamination-free processing and packaging by sealing machinery parts.
• Pharmaceuticals: Maintaining product purity during manufacturing and packaging processes.

Conclusion

Rubber gaskets are indispensable components in a myriad of applications, offering reliable sealing solutions across industries. Understanding their materials, types, and specific uses can help in selecting the right gasket for any sealing requirement. Whether in automotive, aerospace, oil and gas, chemical, food and beverage, or pharmaceutical industries, rubber gaskets play a crucial role in ensuring operational efficiency and safety.

Rubber is a resilient elastic polymer that is obtained from natural and synthetic sources. Rubber is widely used in tyres, seals, footwear, hoses etc. 

What are the types of rubber?

Depending on the source from which it is obtained, rubber can either natural or synthetic. Natural rubber originates naturally from the sap of a tree, while Synthetic rubber is made from components of crude oil, bonded together through chemical processes to form a synthetic polymer. 

How is Natural Rubber Made?

Natural Rubber or NR comes from extracting the liquid sap called latex, from certain trees – especially Hevea Brasiliensis trees. 

Step 1: Latex is extracted by first making a cut in the bark of the tree, and collecting the runny sap in cups. This process is known as tapping. 

Step 2: In cases where uncoagulated latex is required, ammonia is added to prevent the raw latex from solidifying. 

Step 3: In other cases, the latex is coagulated with formic acid or acetic acid, whereupon the coagulum rises to the surface as a white, doughy material. 

Step 4: It is then milled into thin crepe sheets, to remove the moisture.

Step 5: The sheets of rubber are hung over racks in a smokehouse or left to air dry. 

Step 6: Several days later, it is then folded into bales and is ready for processing. 

Where does Synthetic Rubber come from?

Synthetic rubber is made from the catalyzation of monomers from cracked hydrocarbons. They are polymerized to form long chains. The different forms of synthetic rubbers are produced by the copolymerization of the carbon chain with styrene, butadiene, isoprene, chloroprene etc. 

The various rubber compounds have their desirable characteristics through the addition of fillers, protectants, plasticizers, curatives, and other chemicals in various ratios to produce specific physical and chemical properties.

Rubber Processing:

Natural and Synthetic rubber needs to be processed further with additives to achieve desirable physical and chemical characteristics. 

Chemical substances (additives) are added during the blending process to ensure that the eventual rubber produced has the specific properties required. 

Vulcanisation Process:

The process of adding sulphur to the compound to create cross links between the long polymer chain. 

Adding Pigments & Plasticizers:

Pigments: Solid materials that are added into gum rubber, except for those used as vulcanizing agents, are called pigments. There are 2 types of pigments:

1. Reinforcing pigment – These improve the properties of the compound
2. Filler – These act as diluents that can be added into compounds to improve processing capabilities and reduce cost.

Soot and silica are two examples of fillers; these enhance the firmness of the rubber.
Colouring agents: these give the rubber a certain colour.
Preservatives: these protect the eventual rubber product from ageing and ozone.

Plasticizers: these are oily substances which make the rubber end product softer.

X Rings and O Rings are both types of mechanical seals that are used to prevent leakage of fluids, gases and other media, in various industrial applications. While both, X rings and O rings are used for the purpose of sealing, they are used for specific conditions, each providing key advantages to another. They are both often made up of elastomers like, Nitrile or Buna-N, Silicone, EPDM, FKM or Viton, FFKM and HNBR – to name a few. 

Detailed below are some of the differences between the two, and reasoning for why one should pick a particular type of seal. 

X Ring Seals or Quad Rings:

The X rings get their name because the cross-section of the seal resembles the letter ‘X’. It is also commonly known as Quad Rings. 

• Sealing Efficiency:

The X ring is a four-lobed design seal that provides multiple sealing surfaces. As a result, in a dynamic application where the seal endures repetitive impact, an X ring or Quad ring may be more beneficial to use because of the multiple sealing surfaces that prevent leakage. 

• Prevention of Leakage due to Twisting:

Due to their X shaped cross-section, X rings are less likely to twist under dynamic or sliding applications, offering enhanced stability and sealing performance.

• Reduced Compression Set:

X rings are less prone to compression set due to their X design, which distributes the compressive forces evenly. 

• Friction:

The unique shape helps maintain lubrication between the seal and the mating surface, which lowers friction and hence reduces wear – extending the seal’s lifespan. 

• Application:

They are widely used in dynamic applications like reciprocating rods and plungers and rotating or reciprocating shafts, where resistance to friction and wear are critical. 

O Rings:

These seals have the prefix ‘O’ because of their circular or torus cross-section. They are typically made from elastomers but can also be made using specialized compounds for specific applications.

• Reduced Sealing Performance:

An O ring can be used in static applications or low speed pivoting movements, because its surface creates spiraling or twisting movements, resulting in reduced sealing performance. 

• Ease in Installation

O rings are easier to install and their simple design makes them preferable for smaller spaces. They are also much easier to manufacture. 

• Compression Set:

O rings are more prone to compression set or permanent deformation over time.

• Application:

They are widely used in static or dynamic applications with reduced relative movement, such as rotating pump shafts and hydraulic cylinder pistons.

An O ring is a torus shaped ring with a circular cross-section that is used as a mechanical seal or gasket. It can be made using various materials like elastomers, thermoplastics such as PTFE and metal. The primary function of an O-ring is sealing in static and dynamic applications. 

Rubber O rings or Elastomeric O rings are used as an O ring Seal to prevent the loss of fluid or gas. A typical seal assembly consists of a gland that contains and supports the O ring. 

Material Selection Criteria for Rubber O-rings

The choice of your base elastomer or material is made based on two primary factors:

1. Operating Temperature

During compression, a seal changes from its original state and overtime, with exposure to excessive temperatures, beyond a material’s limit, there will be a loss in the elastic memory of the seal. This will result in leakage and system failure. 

      2. Media that needs to be sealed

All elastomers undergo physical or chemical changes when they come in contact with aggressive media. The limit of permissible volume change – shrinkage or swelling – that an elastomer can tolerate, will determine the material of choice for an O-ring seal.

 

What are the materials used in making Rubber O-rings?

In the following points we will go through the various materials or basic elastomers that are used for Rubber O-ring Seals. Depending on requirements of heat resistance, chemical resistance and other physical influences, the base elastomer and the hardness of the finished product (O-ring Seal) are determined. 

• Acrylonitrile-Butadiene (NBR)

Nitrile rubber is the general term for acrylonitrile-butadiene copolymer. The physical properties of the copolymer vary greatly based on the content of acrylonitrile in it. NBR is a versatile compound as it has good mechanical properties and high wear resistance. It is resistant to heat up to 100 deg. C. However, it is not recommended for outdoor applications, as it is not resistant to ozone, weather and atmospheric aging. 

• Styrene Butadiene Rubber (SBR)

Styrene Butadiene Rubber (SBR) O-rings are used in highly abrasive conditions. SBR is known to have good physical properties such as impact strength, good resilience, tensile strength, and excellent abrasion resistance with favorable ageing characteristics. The weaknesses of SBR are that it requires reinforcement and has sub-par low temperature resistance. 

• Ethylene Propylene Diene Monomer (EPDM)

EPDM copolymer is made of Ethylene and Propylene. They are particularly used in outdoor applications and in brake systems that use fluids having glycol base. They have good low temperature resistance and are also resistant to ozone, steam, weather and atmospheric ageing. They are used very often in Automobile Industries. They are not compatible with mineral oil products such as oils, greases and fuels.

• Chloroprene Rubber (CR)

Chloroprene rubber was the first synthetic rubber that was developed commercially. It exhibits good ozone, ageing and chemical resistance. It has good mechanical properties over a wide temperature range from -40 deg C to 121 deg C. It also shows good resistance to high aniline point oils. 

• Silicone Rubber 

Silicone is a polymer of silicon, carbon, hydrogen and oxygen. It is generally stable and non-reactive, and can maintain its properties across a wide temperature range. This material is used when the retention of the initial shape of the product is required. 

• Fluoroelastomer (FKM)

Fluoroelastomers have excellent resistance to mineral oils, greases, certain aliphatic and aromatic hydrocarbons, ozone, weather and aging. They are also resistant to certain solvents, chemicals and high temperatures. Due to their resistance to petroleum based greases and oils, they are widely used in Oil & Gas, Chemical, Automotive and Aerospace applications. FKM Compounds come under the category of High Performance Elastomers. 

• Fluorosilicone (FVMQ / FSL)

Fluorosilicone rubber is a type of silicone rubber with the fluorine group attached to the main polymer chain. As a result, FVMQ seals are more stable with resistance to a wide range of oils, acids, fuels and non-polar solvents. FVMQ also has good compression set resistance and maintains excellent tensile strength. 

• Hydrogenated Nitrile (HNBR)

This is created by the Hydrogenation of NBR. HNBR has superior mechanical characteristics such as high strength, higher heat resistance and wear behavior in dynamic applications. It also helps to reduce extrusion.

• Perfluoroelastomer (FFKM)

FFKM is a champion polymer in sealing applications. It has the widest operating temperature range than any other compound due to the presence of more fluorine than even FKM elastomers. It is also resistant to a wide variety of chemicals and solvents such as hot amines, sour gases and hydrocarbons. 

• Tetrafluoroethylene Propylene (FEPM)

Tetrafluoroethylene Propylene (FEPM) is a high performance elastomer composed of tetrafluoroethylene and propylene. It is compatible with a wide variety of chemicals such as bases, amines, water, engine oils, ozone and alcohols. But it is important to note that it is not compatible with chlorinated and aromatic hydrocarbons and even acetone. 

What are the applications or uses of Rubber O-rings?

• Aerospace:

Sealing Systems: Used in aircraft engines, fuel systems, and hydraulic systems to ensure reliable sealing under extreme temperatures and pressures.

• Automotive:

Engine Components: Provide reliable seals in fuel injectors, coolant systems, and turbochargers.

Transmission Systems: Used in automatic and manual transmissions to prevent fluid leaks and ensure smooth operation.

• Oil and Gas:

Used in valves, pumps, and flanges to prevent leaks and maintain system integrity under high temperatures and aggressive chemicals.

• Chemical Processing:

Pumps and Valves: Provide chemical resistance and prevent leaks in pumps and valves handling aggressive chemicals.

• Pharmaceutical and Food Industries:

Sterile Environments: Used in equipment that requires strict hygiene standards, such as mixers, pumps, and filling machines.

• Semiconductor Manufacturing:

Vacuum Systems: Essential for maintaining vacuum integrity in semiconductor manufacturing processes.

Chemical Resistance: Provide reliable sealing in the presence of aggressive chemicals used in semiconductor fabrication.

What are the properties of Rubber O-rings?

Rubber O-rings are versatile sealing components with a range of properties that make them suitable for various applications. Here are some of the key properties of rubber O-rings:

1. Elasticity and Resilience:

• Elasticity: Rubber O-rings can return to their original shape after deformation, allowing them to create an effective seal by filling gaps.
• Resilience: They can withstand repeated cycles of compression and decompression without significant loss of performance.

2. Compression Set Resistance: 

Rubber O Rings have a lower compression set enabling good sealing performance. This means that the level of deformation is less under a compressive load. 

3. Chemical Resistance:

Different rubber materials offer varying levels of resistance to oils, solvents, chemicals, gases. 

• Nitrile (Buna-N): Good resistance to oils, fuels, and other petroleum-based fluids.
• Viton (FKM): Excellent resistance to high temperatures, chemicals, and oils.
• EPDM: Good resistance to water, steam, and weathering, but poor resistance to oils and fuels.

4. Temperature Range:

Rubber O rings can operate in a wide variety of temperatures, depending on the material:

• Silicone O Rings & FVMQ O Rings can operate at temperatures as low as -70° C
• FFKM O Rings can operate at temperatures as high as +315° C

5. Hardness:

Hardness is measured on the Shore-A scale, typically ranging from 35 to 95. The appropriate hardness depends on the application, with softer O-rings providing better sealing on uneven surfaces and harder O-rings offering better resistance to extrusion.

6. Tear and Abrasion Resistance:

Rubber O rings have varying degrees of resistance to tearing and abrasion. Materials like Polyurethane have excellent resistance to abrasion, while others like Silicone are more prone to tearing.

7. Permeability:

Permeability refers to a material’s ability to resist gas or liquid to pass through it. The extent of Permeability of Rubber O rings can vary depending on the type of the elastomeric material. 

Fluorocarbon (FKM) offers very good permeability to gases, and is also highly resistant to a wide variety of harsh chemicals. As a result, it’s the ideal choice in Chemical Processing Industries.

8. Electrical Insulation:

Rubber O-rings are generally good electrical insulators, which can be beneficial in certain applications.

9. Ageing and Weather Resistance:

This refers to the ability of O Rings to resist ageing due to exposure to Ozone, UV Light, and environmental conditions:

• EPDM: Excellent resistance to Ozone, UV Light and Weathering.
• Silicone: It also offers excellent resistance to Ozone and Weathering.

10. FDA Compliance:

Special rubber compounds and Some specific elastomeric grades in Silicone, EPDM can be formulated to be compliant with US FDA regulations for use in food, beverage and pharmaceutical applications.

11. Cost Effectiveness:

Elastomeric O-rings are generally cost-effective, offering a high performance-to-cost ratio. They are easy to manufacture and replace, making them a practical choice for many sealing applications.

 

What are Engineering Plastics?

Engineering Plastics are high performance synthetic materials with high durability and heat resistance. These engineering plastics are used in industrial components that require superior functionality. The high performance plastics are specifically designed to have better characteristics than general purpose or commodity plastics. These properties may include better mechanical, electrical, and thermal properties; improved chemical and ultraviolet light resistance; and biocompatibility for food packaging applications.

In this article, we will go through the difference between commodity plastics and engineering plastics, the properties of engineering plastics, its uses and applications etc. 

What is the difference between Commodity Plastics and Engineering Plastics? 

Commodity plastics or General Purpose Plastics are used in high volume applications where technical requirements are not stringent. These commodity plastics are relatively inexpensive to produce and possess weaker mechanical properties. 

Some examples of Commodity Plastics include:

• Polypropylene (PP)
• Polyethylene (PE)
• Polyvinyl Chloride (PVC)
• Polystyrene (PS) etc. 

The technologically advanced engineering plastics possess greater mechanical and thermal properties. They have the capability to replace traditional engineering materials such as ceramics and metals in specific cases because of their higher performance and enhanced durability. 

What are the different types of Engineering Plastics?

There are various types of engineering plastics. These may include:

• Poly tetra fluoro ethylene (PTFE).
• Reinforced Poly tetra fluoro ethylene (RPTFE).
• Poly chloro trifluoro ethylene (PCTFE).
• Poly ether ether ketone (PEEK).
• Reinforced Poly ether ether ketone (RPEEK).
• PolyImide (PI).
• PolyOxyMethylene (POM).

What are the Properties of Engineering Plastics?

1.Abrasion Resistance

Abrasion resistance is the ability of a material to resist the loss of volume from its surface due to rubbing, sliding or scraping. Engineering plastics have a low coefficient of friction compared to metals in the same or similar applications. They also possess self-lubrication properties, making them ideal for extended wear and use in load-bearing applications.

2.Chemical Resistance

Chemical resistance describes the ability of a material to withstand a chemical attack for a specific period without significant deterioration of its performance properties. Some types of engineering plastics possess the ability to resist corrosive chemicals without the loss in their form and structure. 

3.Dimensional stability

Dimensional stability is a measure of a material’s ability to retain its fit, form, and functional properties throughout its lifecycle. Engineering Plastic parts are used in demanding applications and are subject to high levels of mechanical stress. These plastic parts also possess the advantage of being lighter in weight compared to metals. For additional dimensional stability, the thermoplastic can be reinforced with glass fibers or other fillers. 

4.Electrical properties

Electrical properties are related to a material’s ability to conduct or insulate electrical currents. Electrical conductivity and resistivity are the two critical electrical properties of engineering plastics. Most engineering plastics are poor electrical conductors which makes them ideal for applications where electrical insulation is desired, such as in various electronic and wiring applications.

5.Thermal Resistance

Thermal resistance refers to a material’s ability to resist changes in its form and structure under varying temperatures. Different engineering plastics possess different levels of thermal resistance, hence it is important to choose the right grade for a particular application. Engineering Plastic like PEEK can be used in high-temperature applications up to 250 deg. C, and PTFE can be used in low-temperature applications as low as -150 deg. C 

6.Flammability

Flammability can be defined as a material’s ability to catch fire. Depending on the type of engineering plastic, the material’s extent of flammability may vary. For eg. materials such as PEEK or PPS are specifically formulated to provide flame resistance and prevent ignition. Polytetrafluoroethylene (PTFE) is a non-flammable engineering plastic. It is a strong, waxy and tough resin produced by the polymerization of tetrafluoroethylene. This engineering plastic is used in high temperature applications, and is stable in conditions up to 500 deg. F

7.Food compatibility

Food compatibility refers to a material’s safety for use when it comes in contact with food. Since engineering plastics are heat resistant, chemical resistant and wear & tear resistant, the material’s form and chemical structure does not change when it comes in contact with food at different temperatures. Of all the engineering plastics, PTFE and PEEK are the most compatible in food and beverage applications. 

8.Impact strength

Impact strength is the ability of a material to absorb energy during plastic deformation. The toughness of plastics is measured by their resistance to impact. Nylon and PEEK have the best impact strength.

9.UV Resistance

Amongst all the Engineering Plastics, PTFE is known to have the best UV Resistance because of the strong carbon-fluorine bonds found in the material. 

What are the Uses and Applications of Engineering Plastics?

ISMAT’s Novum Series of Engineering Plastics are primarily used in industries, as seals and gaskets. They are used across various industries like:

• Food & Beverage
• Automotive 
• Oil & Gas
• Aerospace
• Chemical 
• Medical & Pharmaceutical
• Drinking Water or Potable Water Applications

Engineering plastics can be used to manufacture the following components:

• Valve Seats
• Stem Seals
• Valve sleeves
• Envelope gaskets
• Chevron packings
• O-rings
• Guide rings
• Spring energized seals
• Washers
• Gaskets
• Wear rings
• Piston seals
• Custom designed parts

What is the Process of Manufacturing Engineering Plastic Components?

At ISMAT, manufacturing of the engineering plastic components is done under the following steps:

• Cold compression moulding

Compression moulding is the process of manufacturing complex composite components with the application of pressure under varying temperatures – depending on the composite. Cold compression moulding is a curing process for thermoplastics, where the curing takes place at room temperature. 

• Sintering

Once the moulding process is completed, the components are then taken for Sintering. 

Sintering is a heat treatment process where a material is converted to a solid mass with the application of heat, below the material’s melting point.

• Machining 

Once the component has been cured, it is machined according to the specific dimensions.

• Deflashing

Deflashing involves the removal of excess plastic material from its body surface. Deburring is a type of deflashing technique that removes sharp edges or burrs from plastic materials, leaving the material with smooth edges and fine finished surface.

• Quality Inspection

Quality Inspection is the process of evaluating and verifying if the inspected materials and products conform with the specified requirements. Quality inspectors are a critical part of ensuring that products are of high quality and produced in compliance with the client’s standards.

Summary

Engineering Plastics possess greater physical and chemical properties in comparison to other commodity plastics and metals. These materials can be used in various industrial applications due to factors such as: superior abrasion resistance, thermal resistance and chemical resistance. Engineering plastics may be used in the manufacture of Seals, Valve seats, Gaskets, Washers and other custom molded components. Get in touch with us to learn more about engineering plastics. Follow us on LinkedIn for more such articles.