There are several common materials used in automotive seals, including:

Rubber: a common material for O-rings and other static seals, due to its flexibility and resistance to various fluids.

Silicone: a heat-resistant material that is often used for high-temperature applications, such as engine gaskets.

Fluorocarbon (Viton): a high-performance material that is resistant to a wide range of chemicals and can withstand high temperatures.

Polytetrafluoroethylene (PTFE): a low-friction material that is used for lip seals and other dynamic seals, due to its self-lubricating properties.

Metal: some seals are made entirely of metal or contain metal components, such as spring-loaded seals or mechanical seals.

Cork: a natural material that is often used for gaskets due to its compressibility and ability to conform to irregular surfaces.