The rubber sheath is also called wire guard ring, wire guard and grommet. The English name is grommet. It is widely used in the field of wire harness protection for automobiles and various mechanical and electronic equipment. It is dust-proof and shock-absorbing, reduces the direct friction between the wire harness and the moving parts of the machine, and effectively extends its service life. Automobile harness sheath is one of the rubber sheaths. Its role is to protect the internal circuit of the car from external forces and to play the role of dust insulation.

Rubber products can be made from a variety of materials, such as NR, SBR, NBR, EPDM, CR, SIL, etc. In the application of rubber grommet, SBR is the most popular because SBR is relatively cheap and can be used in general occasions ; But if there are special requirements, such as the selection of NBR or EPDM; also in the case of power line voltage resistance requirements, to consider the insulation performance, we must consider EPDM, because EPDM has excellent resistance to aging, oxidation, resistance Ozone, high and low temperature performance, of which, ozone resistance is better than other general rubber.

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