? Seal commonly used materials include: nitrile rubber, fluorine rubber, silicone rubber, acrylic rubber, polyurethane, polytetrafluoroethylene and the like. When selecting a material seal, the material must be considered for compatibility with the working medium, the ability to follow the operating temperature range of adaptability and speed of rotation of the lip of the rotary axis. When the general work of its lip seal temperature is higher than the working medium temperature 20 ~ 50 ℃, should pay attention to when selecting seal materials. Seal material scope of work related to the use and Seal: NBR material when (NBR) is -40 ~ 120 ℃, Aggreko rubber (ACM) -30 ~ 180 ℃, Viton (FPM) -25 ~ 300 ℃. Engine: Crankshaft - Front crankshaft rear oil seal valve - valve seal (Engine Repair Kit o-ring) (distributor seals, pump seals, balance shaft seals, oil pump seal ...); camshaft - the camshaft oil seal ; Transmission: Transmission - front derailleur, rear oil seal shift lever seal (transmission repair kit o-ring) (splitter - front splitter, rear oil seal); Rear axle: Axle - axle seal after poor cruise control - (front) rear oil seal oil seal posterior horn vector direction of the front oil seal oil seal (the direction of repair kits o-ring) direction booster seal (front axle seal). Those who work with liquid lubricant inside the body but connected to the external parts are required seal. Some are rubber, some are metal, mostly steel reinforced rubber, such as after the crankshaft oil seal, front and rear gearbox oil seal, left axle seal, before the main reducer seals, compressor crankshaft oil seal.