The pressure level and the length of the pressure cycle change have a great influence on the damage of the rubber seal (such as extrusion). The higher the pressure, the greater the impact of other factors on the performance of the seal, such as temperature, speed, rubber seal material, the gap between the piston and the cylinder, and the gap between the piston and the cylinder head.

Temperature

It is difficult to describe the maximum and minimum use temperature of a seal material, because it is the result of a series of factors. The working temperature of the piston and the piston rod are different, and they should be selected differently.

Friction

The friction between the seal and the sealing surface depends on many factors: surface roughness, surface characteristics of the rubber seal, pressure, medium, temperature, seal material, seal type and speed of movement.

Surface treatment of rubber seals

Experience has shown that the surface characteristics of the cylinder piston and piston rod have a great influence on the life of the seal. Surface characteristics are usually defined by the value of surface roughness Ra, which is the arithmetic mean of the absolute value of the surface shape deviation from the center line. However, these values do not fully represent the influence of surface conditions on the seal, because even under the same roughness, different surface shape features can cause different degrees of seal wear on the seal.