The material of rubber seal should meet the requirement of sealing function. Due to the different sealed media and the different working conditions of the equipment, the sealing materials are required to have different applicability. The requirements for sealing materials are:
①Material density is good, not easy to leak the medium.
②Suitable mechanical strength and hardness.
③Good compressibility and flexibility, less permanent deformation.
④Good compressibility and flexibility, less permanent deformation.
⑤Good corrosion resistance, can work in acid, alkali, oil and other media for a long time, its volume a small change in hardness, and do not adhere to the metal surface.
⑥Low friction coefficient, good wear resistance.
⑦It has the softness of sealing surface.
⑧Good aging resistance and durability.
⑨Convenient processing and manufacturing, cheap price, easy materials.
Obviously, it is impossible for any material to fully meet the above requirements, but materials with excellent sealing performance can meet most of the above requirements.
Hard alloy stellite hard alloy, stellite titanium hard alloy mechanical seal
Precious metal gold, silver, indium, tantalum high vacuum seal, high pressure seal, low temperature seal
The performance of the sealing material is an important factor to ensure effective sealing, choose sealing material, mainly according to the working environment of the potted component, such as using temperature, working pressure, the working medium used as well as the movement way and so on. The basic requirements for sealing materials are as follows:
⒈It has certain mechanical properties, such as tensile strength and elongation.
⒉Suitable elasticity and hardness, less compression permanent deformation.
⒊Resistant to high temperature and low temperature, no decomposition and softening at high temperature, no hardening at low temperature.
⒋Suitable for working medium, no swelling, decomposition, hardening, etc.