Silicone rubber balances heat resistance, flexibility and safety, making it a default choice for demanding seals and gaskets.
Why silicone rubber
Silicone rubber keeps its elasticity from -50°C to 200°C and resists UV, ozone and aging.
That stability is why OEMs use it for long-life seals.
Common grades
General purpose, food grade, medical grade and high-tear grades each target a different application.