NBR rubber o-rings products In daily work, careless use of sealing rubber O-rings will cause the O-rings to lose their sealing performance.

　　1.NBR rubber o-rings products Compression ratio and tensile amount. Various formulations of rubber used to make O-rings will produce compressive stress relaxation in the compressed state. At this time, the compressive stress will decrease with the increase of time. The longer the use time, the greater the compression ratio and the greater the amount of stretching, the greater the stress drop caused by the relaxation of the rubber stress, so that the O-ring has insufficient elasticity and loses its sealing ability.

　　NBR rubber o-rings products Note: It is advisable to try to reduce the compression ratio under permissible usage conditions. Increasing the cross-sectional size of the O-ring is the easiest way to reduce the compression ratio, but this will increase the size of the structure.

　　The change in the cross-sectional area of ​​NBR rubber o-rings products is inversely proportional to the change in its perimeter. At the same time, due to the action of tension, the cross-sectional shape of the O-ring will also change, which means that its height is reduced. In addition, under the action of surface tension, the outer surface of the O-ring becomes flatter, that is, the cross-sectional height is slightly reduced. This is also a manifestation of O-ring compressive stress relaxation.

　　The degree of section deformation of NBR rubber o-rings products also depends on the hardness of the O-ring metal seal material. In the case of the same amount of stretching, the O-ring with high hardness will also reduce the cross-sectional height. From this point of view, the material with low hardness should be selected as far as possible according to the conditions of use.