EDPM Material
EPDM is compatible with polar substances, e.g. fireproof hydraulic fluids, ketones, hot and cold water, and alkalis. It is incompatible with most hydrocarbons, such as oils, kerosene, aromatic compounds, gasoline, and halogenated solvents. EPDM exhibits outstanding resistance to heat, ozone, steam, and weather. It is an electrical insulator.

                       Rubber Brake Cup Ring 
It is a rubber cup, also known as a leather ring, is a kind of rubber product in the shape of a bowl (oring). It is usually made of EDPM rubber. 
Rubber brake cups are widely used in the hydraulic braking system, clutch control system and afterburner pump system of cars, light vehicles, minivans and some trucks, playing the role of pressure transmission and sealing