Vertex FC 04: High Hardness FKM Seals for Extrusion-Critical Applications

Vertex FC 04 is a copolymer fluoroelastomer (FKM) compound designed for high temperature and oil resistance, formulated at 90±5 Shore A — the hardest grade in the Vertex FC range. This high durometer makes it especially resistant to extrusion under pressure, a key advantage in applications like packing elements and high-pressure valve seals where the seal is forced into tight clearances under load.

Material Data - VERTEX FC 04

S.No	Description	ASTM Test Method	Unit	Spec
1	Hardness	D 2240	Shore A	90±5
2	Density	D 792	gm/cc	1.83±0.05
3	Tensile Strength	D 412	MPa	10 (Min)
4	100% Modulus	D 412	MPa	7 (Min)
5	Elongation @ break	D 412	%	100 (Min)
6	Compression Set 22hrs@200°C	D 395 Method B	%	25 (Max)
6	Compression Set 70hrs@200°C	D 395 Method B	%	35 (Max)

Compatibility Chart Data Sheet

Vertex FC 04 FKM Properties

ISMAT manufactures Vertex FC 04 with a high 90±5 Shore A hardness, backed by in-house testing to ensure consistent quality across every batch. This is the firmest compound in the Vertex FC lineup, with a higher 100% modulus that helps it resist extrusion and deformation in high-pressure sealing environments — conditions where softer FKM grades tend to fail first.

Because of this added rigidity, Vertex FC 04 is a strong fit for packing elements, valves and other high-pressure components across pumps, automotive and compressor systems. It retains the core Vertex FC strengths of lower volumetric swell and very good chemical compatibility, while offering the extra toughness needed for demanding, pressure-intensive applications.

If your sealing application involves high pressure alongside oil and heat exposure, Vertex FC 04 offers the extrusion resistance you need. Contact ISMAT to discuss your specific requirements.