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Plastics for valve seats, seals, and gaskets

Plastic seals must have low enough stiffness to conform to mating surfaces and sufficient creep resistance to maintain tight seals. When plastic seals are in contact with moving parts, the plastic must have low enough friction and sufficient wear resistance so that the device can actuate properly throughout many cycles of use.

Additionally, the plastic has to be compatible with the operating temperature of the device and it must withstand any chemicals that it will come into contact with.


High strength, stiff, low friction engineering plastic with good wear properties.

DuPont™ Vespel® Polyimide

Extremely high temperature creep resistant plastic with excellent friction and wear characteristics.


Fluoropolymer with outstanding mechanical properties and dimensional stability.


Plastic material with excellent mechanical strength, stiffness, and abrasion resistance.


Flexible fluoropolymer with outstanding chemical resistance and electrical properties.


Fluoropolymer with outstanding dimensional stability, mechanical properties, and temperature range.


Strong, stiff plastic with outstanding chemical resistance; performs over a wide range of temperatures.


Flexible fluoropolymer that performs well in extreme temperature and harsh chemical environments.


Low friction engineering plastic with outstanding chemical, high temperature, and weathering resistance.


High purity engineering plastic with excellent chemical, abrasion, and flame resistance.