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In addition to the general requirements of sealing material, the sealing ring should also pay attention to the following conditions:
(1) flexibility and resilience;
(2) appropriate mechanical strength, including expansion strength, elongation and tensile strength, etc.
(3) the performance is stable, it is not easy to melt in the medium, and the thermal contraction effect (joule effect) is small.
(4) easy to process molding and maintain precise dimensions.
(5) non-corrosive contact surfaces, non-polluting media etc.
The most suitable and most commonly used materials to meet the above requirements are rubber, so the sealing ring is mostly made of rubber. There are many kinds of rubber, and there are always new rubber varieties. When designing and choosing, we should understand the characteristics of various kinds of rubber and make reasonable choices.
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