Compression of the O-ring

The compression of the O-ring is generally 15-30% depending on the specific application. Generally static sealing, in order to obtain a better sealing effect, you can choose a larger compression, dynamic sealing in order to reduce the resistance, choose a smaller compression. Of course, this is just a recommendation or reference, the application is very different, can be designed according to actual needs, I have encountered 7% compression occasions. For vacuum seals, there is the concept of the so-called filling rate, which requires O-rings to fill the entire groove. About the material, commonly used for buqing rubber NBR, fluorine rubber FKM, ethylene propylene rubber EPDM, silicone rubber SI (VMQ), polyurethane PU, polytetrafluoroethylene PTFE and other material characteristics, more complex, here only do a brief introduction. The most commonly used rubber, suitable for most occasions, oil resistance is good, the temperature range is generally -30~100℃. The physical and chemical properties of fluorine rubber are higher than that of butyl rubber, the temperature range is generally -20~200℃, the acid-base resistance is relatively strong, and the vacuum sealing performance is excellent. The temperature range of ethylene propylene rubber is -30~150℃, which can be used for sealing high-pressure water vapor. The anti-aging performance of silicone rubber is more prominent, and the temperature range is -40~200℃, but the tear resistance is poor. Polytetrafluoroethylene chemical and physical properties are superior, good stability, basically can resist all chemical media, but the elasticity is poor, only used in some special occasions.