Rubber O-rings seal due to the compressive stress of the material. The pressure on the O-ring is generally 35-350kg/c㎡ (3.5-35MPa). In general, the higher the hardness of the O-ring, the greater the pressure on the O-ring. The conventional hardness of the O-ring is 70+/-5A (Shore hardness), so the high-pressure sealing system should try to use a higher hardness O-ring.
In the actual use of the O-ring, if the hardness of the O-ring does not match the operating environment, it will also cause the edge of the O-ring to be bitten by the gap; therefore, the greater the pressure of the liquid or gas, the smaller the hardness of the O-ring, the less the O-ring The more serious the edge is bitten by the gap; if the O-ring pressure exceeds the limit, it is recommended to use a retaining ring to avoid damage to the O-ring.
The service life of the O-ring is mainly determined by the material of the O-ring and the use environment (temperature, pressure, medium, etc.). O-rings are mainly divided into nitrile rubber O-rings, fluororubber O-rings, silicone rubber O-rings, EPDM O-rings, neoprene O-rings, natural rubber O-rings, etc.
The service life of the static O-ring seal is obviously much longer than that of the dynamic O-ring seal because some O-rings are sleeved on the shaft and need to be slid or rotated to seal. At this time, the service life of the O-ring is It is determined by factors such as the matching size and surface roughness of the groove and hole matched with the o-ring. Therefore, it is difficult to give an exact number of years for the service life of O-rings. The service life of O-rings maybe 1 year or less when used improperly. When used properly, the service life of O-rings may be 3 years, 6 years, or more.
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