Everyone knows that the main function of seals is to prevent leakage, so many people think that vacuum and no leakage are qualified seals, but as an important role of mechanical equipment, seals are only as simple as not leakage. A batch of qualified seals should meet the following requirements:

1. First of all, the material is dense, and it is not easy to leak the working medium or material, because the function of the seal itself is to prevent leakage.

2. Seals have good adaptability and stability to working media.

3. Proper mechanical strength and hardness are almost unaffected by the working medium, because the reactions of seals made of different materials to different working conditions are different.

4. Seals have good compressibility and small permanent deformation.

5. Good temperature adaptability, no softening and decomposition at high temperature and no hardening at low temperature.

6. Small friction coefficient and good wear resistance.

7. Good corrosion resistance, no softening at high temperature, no decomposition, no hardening at low temperature, no brittle cracking.

8. It has good flexibility and elasticity to adhere to the sealing surface.

9. Seals have good ozone resistance and aging resistance, long service life.