What determines the life of the sealing ring?

What determines the life of the sealing ring? Box sealing ring manufacturers for you to introduce it:

1. Polyurethane and thermoplastic materials for 4 years

2. NBR, hydrogenated NBR, neoprene for 6 years

3. Ethylene propylene rubber for 8 years

4, fluoro rubber, silicone rubber, fluoro silicone rubber 10 years

Perfluoro rubber 20 years

Teflon indefinitely