Description of the characteristics of the seal fluoro rubber

The high temperature resistance of the seal fluororubber is the same as that of silicone rubber, which is arguably the best in the current elastomer. 26-41 fluorine rubber can be used for a long time at 250 °C, short-term use at 300 °C; 246 fluorine rubber heat resistance is better than 26-41. The properties of 26-41 after air heat aging at 300 ° C × 100 hours are equivalent to those of 246 after 300 ° C × 100 hours hot air aging, and the elongation at break can be maintained at about 100%, and the hardness is 90 to 95 degrees. . Model 246 maintains good elasticity after hot air aging for 16 hours at 350 ° C, maintains good elasticity after hot air aging for 110 minutes at 400 ° C, and contains spray carbon black, thermal black carbon or carbon fiber after hot air aging for 110 minutes at 400 ° C. The elongation of the rubber increases by about 1/2 to 1/3, and the strength decreases by about 1/2, and still maintains good elasticity. The 23-11 type fluorine rubber can be used at 200 ° C for a long time and used at 250 ° C for a short period of time.

    Fluororubber has a high degree of chemical stability and is currently the best medium for all media. Sealing type 26 fluororubber resistant to petroleum-based oils, diester oils, silicone ether oils, silicic oils, resistant to inorganic acids, resistant to most organic, inorganic solvents, pharmaceuticals, etc., only resistant to low molecular weight ketones, Ether, ester, not resistant to amine, ammonia, hydrofluoric acid, chlorosulfonic acid, phosphoric acid hydraulic oil. The properties of the 23 type fluorine rubber are similar to those of the type 26, and it is more unique. Its inorganic acid with strong oxidizing properties such as fuming nitric acid and concentrated sulfuric acid is better than the type 26, and is impregnated with 98% HNO3 at room temperature. Its volume expansion is only 13% to 15%.