- The rear valve cover gasket is manufactured from various materials, including rubber, cork, or silicone, each with its own advantages. Rubber gaskets provide excellent sealing properties and durability, while cork gaskets are more environmentally friendly and have good heat resistance. Silicone gaskets, on the other hand, offer superior resistance to high temperatures and chemicals, making them ideal for high-performance engines.

Nitrile Butadiene Rubber (NBR, nitrile)
PTFE Lip seals
1. Criteria for selecting oil seals
Generally, an oil seal is made up of an outer circular metal part and a bonded inner flexible material (often nitrile rubber) that does the actual sealing.
Well-balanced in terms of resistance to abrasion and high and low temperatures
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Rubber type
The range of uses of peroxydically cross-linked EPDM includes in hot water and steam seals. EPDM is also very resistant to ageing and ozone. Compared with the usual types of synthesis natural rubber it has good resistance to cold temperatures. EPDM is not resistant to aliphatic or aromatic hydrocarbons or mineral oil products. Resistance to chemicals, and also to oxidising agents, is very good. Temperature range from -50 °C to +140 °C depending on type.