VULCANIZED FORM FOR PHOSPHORUS-BASED ADDITIVE- CONTAINING OIL

摘要

PROBLEM TO BE SOLVED: To obtain a vulcanized form suitable as an oil sealing material suppressed in swelling against a phosphorus-based additive-containing oil such as a motor vehicle gear oil and consisting of an ethylene-hexafluoropropylene- based copolymer. SOLUTION: This vulcanized form is obtained by vulcanizing a vulcanizable composition comprising a vulcanizable elastomeric copolymer composed of ethylene structural unit and hexafluoropropylene structural unit and an organic vulcanizing agent and substantially containing no metal oxide. This vulcanized form thus obtained has a volume swelling rate for phosphorus-based additive- containing oil at <=15%.