The choice of O-ring hardness is more important.
such as a power station pump turbine hardness of the Shore seal ring, often peel off, or even transverse cut off, after the use of 85~90 (Shore) sealing ring, the effect is ideal. Low hardness, easy installation, but easy to appear peeling, installation damage, extrusion and even pressure explosion.
The hardness is too high, the installation is not convenient. Usually O-ring hardness 40~90 IRHD, but in the use of general IRHD is more appropriate, for silicone rubber is the exception, the general use of a IRHD.