??Select the correct o-ring size

??The right choice o-ring main specifications and materials, dimensions, tolerances, an important amount of compression is directly related. The following is my experience for everyone to share:

??1, select o-ring material specification must first determine good o-ring, currently in industrial parts, material life, o-rings are NBR nitrile rubber, NR natural rubber, CR chloroprene rubber, EPDM EPDM rubber, HNBR hydrogenated nitrile rubber, SILICOME silicone, FKM, VITON, fluorine rubber, FLS silicon fluorine rubber, PU polyurethane, SBR styrene-butadiene rubber, Buna Buna, acrylate rubber ACM, PTFE, polytetrafluoroethylene and the like. These materials each have their whereabouts and purposes, there is oil, there is resistance to chemical substances, high temperature resistance, abrasion resistance, and so on. So the choice o-ring specifications need to know where to use this product, what needs to be resistant, what role, life, so as to selectively target of what you need o-ring material.

??2, o-rings and size have an outer diameter, inner diameter, diameter expressed. Drawing on our long stated the size of the inner diameter and the diameter, an outer diameter equal to the inner diameter + 2 * diameter. Or only marked the outer diameter and the diameter size. Both can choose one.

??3, o-ring has an inner diameter of the main specifications of tolerance tolerance, diameter tolerances. o-ring depends mainly on the size of the size specification tolerance, the greater the size, the greater the tolerance of course. Such as an inner diameter of 0.05 to 1.79mm o-ring tolerance standard +/- 0.10MM, 0.05 to 1.79 MM diameter of the O-ring tolerance standard +/- 0.07MM.

??4, it is the choice of compression o-ring size is important, because the choice is not correct, or not at the time of product assembly seal, when otherwise they assembled tightly, so that did not play a role in the desired product. How do we choose the right amount of compression o-ring specifications of it, you make reference to the following: the amount of compression o-ring is generally depends mainly on the hardness of the material o-ring, o-ring if the hardness is 70 degrees, So the amount of compression o-ring is equal to 20%. That, of course, the lower the hardness of the o-ring, o-ring compression greater, mainly for low-pressure areas. Then the higher the hardness of o-ring, the smaller the amount of compression o-ring, mainly used for high pressure, pressure, small resistance environments. So, you can get any amount of compression hardness o-ring you need.