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More compact engine compartments combined with higher powered fuel efficient engines has led to higher operating temperature requirements, thus creating the need for improved lubricants, causing severe demands on conventional elastomers. Fuel injection creating the problems of sour gasoline, requires a departure from traditional polymers. To meet these new stringent demands and to achieve longer maintenance free automobile operation, Nippon Zeon Company commercialized “Zetpol”, highly saturated nitrile (HSR), a new oil resistant elastomer, exhibiting higher physical properties, remains stable at elevated temperature, and much improved resistance to heat, oil additives, oxidized lubricants, sour gasoline, acid and alkalis. HSN is being used for components such as dynamic and static seals, gaskets, 0-rings, diaphragms, hoses, tubing, timing belts, etc.

Polychloroprene rubbers have well balanced properties, but they lose flexibility at low temperatures and are not sufficiently resistant to high temperatures. Propylene oxide -epichlorohydrin -allyl glycidyl ether terpolymer is no less oil resistant than polychloroprene rubbers and has a −50°C brittle point without using plasticizers. With a sulfur vulcanizing system, the terpolymer's vulcanizing curve is snappy. With the 2.4.6 -trimercapto-s-triazine cure system, good heat resistance and low compression set vulcanizates are obtained. Terpolymers reinforced with silica have high tensile strength and good flex life.