What factors will affect the performance of O-rings?

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What factors will affect the performance of O-rings?

I believe that through the previous introduction, everyone has a good understanding of O-rings, but do you know what factors will affect the performance of O-rings? Let the O-ring manufacturers take you to analyze it, and hope to let everyone Get a better understanding of O-rings.

O-ring hardness: O-ring material hardness is the most important index for evaluating sealing performance. The hardness of the O-ring determines the compression of the O-ring and the maximum allowable extrusion gap of the groove. Since the nitrile rod seal of Shaw A70 can meet most of the conditions of use, if the sealing material is not specified, the nitrile rubber of Shao A70 is generally provided.

O-ring extrusion gap: The maximum allowable extrusion gap gmax is related to the system pressure, the cross-sectional diameter of the O-ring and the hardness of the material. Generally, the higher the working pressure, the smaller the maximum allowable extrusion gap gmax. If the gap g exceeds the allowable range, it will cause the O-ring to squeeze out or even be damaged.

Compression set: Another index for evaluating the sealing performance of O-rings is the compression set of the selected material. Under pressure, the O-ring, which is an elastic element, produces elastic deformation, and as the pressure increases, permanent plastic deformation will also occur.

O-ring pre-compression: The O-ring is installed in the groove. In order to ensure its sealing performance, an initial compression should be reserved. For different applications, the amount of pre-compression relative to the cross-sectional diameter W is also different. Generally, it is about 15%-30% in static rod seal, and about 9%-25% in dynamic rod seal.

O-ring tension and compression: When the O-ring is installed in the groove, it must be stretched or compressed. If the value of stretching and compression is too large, it will cause the O-ring cross section to increase or decrease excessively, because stretching 1% correspondingly reduces the cross-sectional diameter W by about 0.5%. For hole sealing, the O-ring is best in tension, and the maximum allowable stretch is 6%; for shaft sealing, the O-ring is preferably compressed along its circumference, and the maximum allowable circumference compression is 3 %.

The above introduced for you are the factors that will affect the performance of the O-ring. I hope it can be helpful to you. If there is anything you don’t know, you can directly communicate with our customer service. We will serve you wholeheartedly. thanks for watching.

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