Everyone knows that the main function of seals is to prevent leakage, so many people think that vacuum and leak proof seals are qualified seals. However, as an important role in mechanical equipment, seals are only as simple as not leaking. A batch of qualified seals needs to meet the following conditions:

1. Firstly, the material is dense and not prone to leakage of the working medium or material, as the sealing element itself serves to prevent leakage.

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

3. It has appropriate mechanical strength and hardness, and is almost unaffected by the working medium, because different materials of seals have different reactions to different working conditions.

4. The sealing element has good compressibility and minimal permanent deformation.

5. Good temperature adaptability, does not soften or decompose at high temperatures, and does not harden at low temperatures.

6. Low friction coefficient and good wear resistance.

7. Good corrosion resistance, does not soften or decompose at high temperatures, does not harden or crack at low temperatures.

8. Good flexibility and elasticity in fitting with the sealing surface.

9. The sealing element has good ozone resistance and aging resistance, and a long service life.