الوصف

An automatic transmission has many seals and gaskets to control the flow of hydraulic fluid and to keep it from leaking out.� There are two main external seals: the front seal and the rear seal. The front seal seals the point where the torque converter mounts to the transmission case. This seal allows fluid to freely move from the converter to the transmission but keeps the fluid from leaking out.� The rear seal keeps fluid from leaking past the output shaft.
To consider the environmental conditions, the following properties are important:
1. Good chemical resistance
2. Good resistance to heat and low temperature
3. Good resistance to ozone and weather aging
4. Good elasticity
5. High resistance to water
6. Low compression set
7. Raw material cost
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