The selection of O-ring material is of great significance for its sealing performance and service life. The performance of the material directly affects the performance of the O-ring. In addition to the general requirements for sealing ring materials, O-ring seals should also pay attention to the following conditions:
(1) Rich in elasticity and resilience;
(2) Appropriate mechanical strength, including expansion strength, elongation, and tear resistance.
(3) Stable performance, less prone to swelling in the medium, and low thermal shrinkage effect (Joule effect).
(4) Easy to process and maintain precise dimensions.
(5) Non corrosive contact surfaces, non polluting media, etc.
The most suitable and commonly used material to meet the above requirements is rubber, so O-rings are mostly made of rubber material. There are many varieties of rubber, and new rubber varieties are constantly emerging. When designing and selecting, it is important to understand the characteristics of various rubber varieties and make reasonable choices.
Secondly, there is silicone in rubber, which is also commonly used for manufacturing O-ring seals. For example, the sealing ring of the fresh-keeping box and the air hole gasket on the lid. The sealing ring produced by high-quality silicone is not only smooth and non stick to glass, but also has strong elasticity. Non toxic and odorless.
