Mechanical seal types and uses of materials
Mechanical seal material should be sealed to meet the functional requirements. Caused by the sealed medium is different from different working conditions and equipment require sealing materials have different adaptability. The requirements of the sealing material is generally:
1) Material density is good, not easy to leak medium;
2) have the appropriate mechanical strength and hardness;
3) good compressibility and rebound elasticity, permanent deformation is small;
4) does not soften at high temperatures, does not decompose, do not harden at low temperature, not brittle;
5) Good corrosion resistance in acid, alkali, oil medium to long-term work, small changes in its size and hardness, and do not adhere to metal surfaces;
6) The coefficient of friction, wear resistance;
7) have combined with the sealing surface softness;
8) good resistance to aging, durable;
9) processing convenient, cheap and easily drawn.
Rubber is the most commonly used sealing materials. In addition to rubber, for sealing materials were also made of graphite, etc., and various sealants such as PTFE.
