The service life of the O-ring is mainly determined by the material of the O-ring and the environment in which it is used(temperature,pressure,medium,etc.).O-rings are mainly divided into materials:nitrile rubber O-ring,fluoro rubber O-ring,silicone rubber O-ring,EPDM O-ring,neoprene O-ring,natural rubber O-ring,etc..The service life of the static O-ring seal is significantly longer than the service life of the dynamic O-ring seal,because some O-rings need to be slid or rotary sealed on the shaft,and the service life of the O-ring is It is determined by factors such as the fit size and surface roughness of the groove and the hole which are matched with the o-ring.Therefore,the service life of the O-ring is difficult to give an exact number of years.The service life of an improper O-ring may be 1 year or less.If used properly,the service life of the O-ring may be 3 years,6 years or higher.

The O-ring in the groove will be deformed under the pressure of the medium,and the edge portion of the O-ring will flow into the gap position to achieve the O-ring sealing function.The greater the pressure on the O-ring,the greater the O-ring deformation,the better the O-ring will seal.When the pressure applied to the O-ring exceeds its tolerance,the O-ring will be squeezed into the gap,causing the O-ring seal to fail.For the design of the O-ring groove,the relationship between O-ring hardness,working pressure and clearance tolerance must be properly matched.And in the design of the O-ring groove,the O-ring groove gap should be as small as possible.In actual operation,it is inevitable that the gap of the O-ring groove will be large.In order to avoid the O-ring being squeezed into the gap,it is necessary to consider the material with strong anti-extrusion ability and good dimensional stability.Type rings,such as polyurethane O-rings.