General causes of damage to seals, almost the work of the seal requirements:

1, hardening (aging) - seals where a leak cause is itself material to be hardened by the temperature effect, when the hardness is too high, the seal can not be filled with the gap between the parts, it will leak.
Wear - seal wear and tear involved with the part surface finish, velocity, and transmission media, different sealing materials to adapt to different velocity.

2, extrusion - when the seals to put too much pressure will be squeezed out of the metal gap, damaged seals leak, this case involves the seals hardness and metal gap is too large, if in the design, selection , processing or installation not handled properly, there will be squeezed out damage.

Corrosion - the performance of the seals to soften or even dissolve the seals media intrusion error occurs when the selection of materials. If the media is water or solvent should pay special attention to.
General seal temperature, speed, pressure, and materials can be used for the following simple classification (for reference only):

Temperature rating for the material speed for the material pressure ratings apply materials110 ℃ nitrile rubber / polyurethane of 0.5 M / S nitrile rubber with hardness and design 200kg/cm2200 ° C Viton 0.6 M / S-polyurethane 400kg / cm2 with the hardness and design 260 ℃ PTFE 14 M / S PTFE 700kg / cm2 with the hardness and design.



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