The choice of O-ring hardness is more important.
For example, the hardness of the water pump turbine in a power station is 70 (Shore), which is often peeled off, or even cut horizontally. After that, the sealing ring of 85 to 90 (Shore) is used, and the effect is ideal.
Low hardness, easy to install, but prone to peeling, installation damage, extrusion and even pressure explosion. The hardness is too high and the installation is inconvenient.
Usually the hardness of O-rings is 40～90 IRHD, but in use, 70 IRHD is more suitable, except for silicone rubber, 60 IRHD is generally used.