Kalrez 4079 perfluroelastomer combines the elastomeric properties of Viton with the chemical resistance of PTFE. Kalrez 4079 should be considered for service in high temperature, corrosive environments such as: Polar Solvents such as Ketones, Esters and Ethers. . Strong Organic Solvents such as Tetrahydrofuran, Bensene, Dimethylformamide and Perchloroethylene. Acids such as Hydrochloric, Nitric and Sulfuric. . Strong Oxidizing Agents such as Dinitrogen Tetroxide and Fuming Nitric Acid. . Metal Halogen Compounds such as Titanium Tetrachloride and Diethylaluminum Chloride. . Hot Mercury and Caustic Soda. . Chlorine-Wet and Dry. . Inorganic Salt Solutions. . Fuels such as JP-5, Aviation gas and Kerosene. . Kalrez 4079 exhibits exceptional thermal stability and is serviceable at long-term temperatures to 316 degreesC and intermittent temperatures to 343 degreesC. Kalrez 4079 is not recommended for use in sealing applications below -5 degreesC.