... to all kinds of contact with the atmosphere, the sun, smelly itchy environment and a variety of fire and chemical resistant ... 45 °C ~ 90 °C.FFKM (perfluorinated rubber) sealsExcellent resistance to chemical corrosion, acid, alkali, ketones, esters, ethers, strong itch agent ... known chemicals. The highest heat to 300 °C. Usually used to solve complex sealing problems of the environment, nearly a ...