What factors should be considered when choosing O-ring specifications?

Do you know what factors should be considered when choosing an O-ring? Here are some O-ring manufacturers to give you a brief introduction, hoping to be helpful to you.

When choosing O-ring specifications, we must first determine the material of O-ring. At present, the materials of O-ring in industrial parts and daily life include NBR nitrile rubber, NR natural rubber, CR neoprene, EPDM Propylene rubber, HNBR hydrogenated nitrile rubber, SILICOME silicone, FKM, VITON, fluorine rubber, FLS silicon fluorine rubber, PU polyurethane, SBR styrene butadiene rubber, Buna rubber, acrylic rubber ACM, PTFE, polytetrafluoroethylene, etc. . The above materials have their own destinations and uses, such as oil-resistant, chemical-resistant, high and low temperature resistance, abrasion resistance, and so on. Therefore, when choosing O-ring specifications, you must know where the product is used, what it needs to be resistant, what role it plays, and its service life, so that you can target the O-ring material you need.

O-ring specifications are expressed by outer diameter, inner diameter and wire diameter. As long as the dimensions of the inner diameter and the wire diameter are indicated on our engineering drawings, the outer diameter is equal to the inner diameter + 2 * wire diameter. Or only mark the dimensions of the outer diameter and the wire diameter. You can choose one of the two.

O-ring specification tolerances mainly include inner diameter tolerance and wire diameter tolerance. O-ring specification tolerance mainly depends on the size of the size, the larger the size, the larger the tolerance of course. For example, the tolerance standard for O-rings with an inner diameter of 0.05 to 1.79mm is +/-0.10MM, and a wire diameter of 0.05 to 1.79
MM's O-ring tolerance standard is +/-0.07MM.

The amount of compression is very important when selecting O-ring specifications, because if the selection is not correct, the product will not be sealed during assembly, or it will be too tight during assembly, which will not play the required role of the product. So how do we correctly choose the compression of O-ring specifications? The following is for your reference: The compression of O-rings is generally determined by the hardness and material of the O-ring. If the hardness of the O-ring is 70 degrees, Then the compression of the O-ring is equal to 20%. Of course, the lower the hardness of the O-ring, the greater the compression of the O-ring, which is mainly used in places with low pressure. The higher the hardness of the O-ring, the smaller the compression of the O-ring, which is mainly used in environments with high pressure, pressure resistance and low resistance. By analogy, you can get the compression of any hardness O-ring you need.

What I have introduced above are the factors to be considered when choosing O-ring specifications. I hope it will be helpful to everyone.

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