Sealing ring qualifications conditions:

(1) full of elasticity and resilience;

(2) the appropriate mechanical strength, including expansion strength, elongation and tensile strength, etc.

(3) the performance is stable, not easy swelling in the medium, small heat shrinkage effect (joule effect).

(4) easy to processing molding, and can keep the precision of size.

(5) no contact corrosion, no pollution medium, and so on.

Meet the above requirements the most suitable and the most commonly used material is rubber, so the sealing ring is mostly made of rubber material.A wide variety of rubber, and constantly have new rubber varieties, design and selection, should understand the characteristics of all kinds of rubber, a reasonable choice.