FLUORORUBBER BASE SEALANT COMPOSITION AND FLUORORUBBER BASE SEALANT

摘要

A fluororubber base sealant composition comprising 100 pts.wt of fluororubber, the fluororubber being a copolymer composed of 20 to 23 mol% of perfluoromethyl vinyl ether, 60 to 70 mol% of vinylidene fluoride, 10 to 20 mol% of ethylene tetrafluoride and 0 to 10 mol% of propylene hexafluoride (the sum of these: 100 mol%) together with a brominated and/or iodized unsaturated fluorohydrocarbon for crosslinking sites; 2 to 50 pts.wt. of bituminous fine powder; 0.5 to 6 pts.wt. of organic peroxide; and 1 to 10 pts.wt. of polyfunctional monomer. There is further provided a sealant obtained by vulcanizing this composition. This sealant excels in heat resistance, cold resistance and fuel oil resistance.