Viton (R) is the trademark of fluoroelastomer made by Du Pont in the U.S.A., and is called FKM-70 or "Type 4" in industrial standards, and is a rubber material for O-rings with excellent heat resistance and chemical properties. NBR (Nitrile Rubber), the material used for general O-rings, has excellent elasticity and resilience to deformation, and especially the one used for the center seal of the stock product has a high level of durability. However, if the engine is subjected to heat for many years, or if the engine is tuned to generate more heat, heat hardening may occur. FKM (Viton) has a heat-resistance temperature limit of more than 230°C, compared to NBR's 120°C. The durability of FKM does not change even after several weeks of immersion in gasoline, which makes it very suitable for air-cooled engines.
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