Poly Ether Ether Ketone (PEEK) is a strong, stiff engineering plastic that was first developed in 1978. It is a semicrystalline material which has the ability to retain its excellent chemical and mechanical resistances at high temperatures. It has a compartively high melting point and is commonly used to make that are thermostable and electrically insulating. In its solid form, PEEK can be easily milled by CNC Machines.