SIL imports imports of silicon rubber ring rubber ring molding method SIL seal O-rings and other sealing products 1) molding method - the old method, the disadvantage of this method more production of rubber products, there has been a series of shortcomings, the article is weighed of stereotypes filled rubber mold process is performed after the mold cavity, in order to prevent waste arising from lack of material, methods used to make the plastic material quality pre-weighed taken significantly larger than the finished product quality, and the remaining gum can not reused to form burrs loss; at the same time remove the burr on the finished product, but also consume complementary human resources; molding process products can not achieve mechanization and automation, the dragon it is thick-walled products, curing cycle lasts quite long . 2) rubber injection molding method - the current O-rings and other sealing products molding method used rubber injection molding of plastic material is preheated by injection molding machine screw or plunger, through the nozzle high pressure, high speed injection mold type chamber, and vulcanization molding production methods. Rubber injection molding process is a new method developed on the basis of molding method. Import viton seals Size notation import SIL silicone rubber O-ring sizes of representation mainly in diameter, diameter, diameter expressed. ID represents the inner diameter is usually an outer diameter OD is said CS diameter is expressed. Generally marked on the drawing sheet size o-ring inner diameter and the diameter on it. As the diameter is 10mm, diameter is 1.8mm, so the outer diameter o-rings = 10 + 1.8 * 2 = 13.6mm. According to different materials o-ring size is divided into Viton o-ring specifications, silicone O-ring specifications, NBR rubber o-ring specifications, EPDM rubber o-ring specifications, HNBRO-ring specifications. Other import O-ring material EPDM rubber (EPDM), extreme high temperature of 150 degrees, heat, light and chemical resistance, no oil. Silicone material (SIL) - high temperature of 250 degrees, low temperature -60 degrees, oil in general, do not wear. Fluoro rubber (FKM)) - 240 degree heat, oil resistance, abrasion resistance, chemical resistance and excellent airtightness. Polyurethane (PU) - 120 degree heat, oil, high wear resistance; the high hardness, is generally not made of O-rings. Polytetrafluoroethylene (PTFE) - High temperature 280 degrees, good oil resistance.