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Specification testing has shown FKM fluoroelastomers are significantly affected by newer engine oils, transmission fluids and extreme pressure gear lubricants. A new fluoroelastomer and cure system has been developed which provides better chemical resistance vis-a-vis FKM fluoroelastomers to these fluids. The unique backbone structure of propylene, tetrafluoroethylene and a specific third monomer is different from FKM fluoroelastomers and together with a proprietary cure system accounts for the improved chemical resistance. This new elastomer is available from 3M and it will be referred to as TPT in this paper.