??Density rubber o-ring

??Density nitrile / nitrile rubber is about 1.3, the value of the number refers to the mix of density is the density of the finished product.

??EPDM o-ring density is about 1.2, also refers to the density of the finished product.

??Because the rubber material into raw rubber and rubber, of course, it's not the same density. Rubber, raw material means, not through the rubber mixture when the recipe after recipe refers to the process, and after several kneading plastic materials, but also directly on the machine can produce a rubber material. Since then can be compared, rubber compound of a density greater than the density of rubber raw rubber. In the mixing process, which added some rubber carbon black, accelerators, etc., to improve oil-resistant rubber o-ring, corrosion resistance, abrasion resistance, heat resistance, adhesion resistance, low temperature resistance, ozone resistance, electric insulating property, elasticity and the like.

??Characteristics of nitrile rubber oil resistance is good, and with other polymers used (except PVC outside) have reduced oil resistance trend exists. Sealing material shall meet the requirements of a sealing function. Due to different medium to be sealed, and the working conditions of the device, sealing materials having different requirements for adaptability. Its general requirements are:

??1) rubber o-ring material is dense, and not leaking medium;

??2) rubber o-rings have suitable mechanical strength and hardness;

??3) rubber o-ring compression and resilience, and permanent deformation;

??4) a rubber o-ring temperature does not soften, does not decompose at low temperatures without hardening, embrittlement;

??5) rubber o-rings good corrosion resistance, acid, alkali, oil medium, long-term work, its small size and hardness changes, and not adhering to the metal surface;

??6) rubber o-ring friction coefficient, good wear resistance;

??7) having a rubber o-ring sealing surface binding of softness;

??8) rubber o-ring aging resistance, and durability;

??9) the rubber o-ring manufacturing process convenient, cheap, easily drawn.

??Rubber is the most common sealing material. In addition to the rubber, the sealing material is suited to do there such as graphite, Teflon, and various sealants.