Taiwan's imports of white rubber ring white top Wall imported medical grade O-rings used in all imported glue material, high quality. Commonly used material nitrile rubber NBR, VITON (FKM) fluorine rubber, silicone SIL, EPDM EPDM, CR chloroprene rubber. Made of different materials imported o-rings and other sealing products with different properties such as wear resistance imported o-ring, anti-aging high temperature seals, o-ring ultra-low temperature, corrosion-resistant seal imports. If the classification of the uses, can be divided into hole sealed, shaft seal, fixed seal, seal, swing seals. O-ring is mainly used for fluid (such as: water, oil, air, chemical solvents, chemicals, etc.) of the static sealing gap. Long-term use temperature of -60 ℃ to 220 ℃. From material to material, the static pressure is less than 20Mpa. Sometimes for dynamic, dynamic pressure is smaller than 5Mpa, and semiconductor vacuum seal. Taiwan Wall top importing O-ring (O-ring) has passed and so the British WRAS certification; food-grade o-ring seal medical imports of US NSF / FDA; Germany DVG / KTW. Good quality import O-ring (O-ring), smooth surface, no needle, no edges, accuracy of +/- 0.03 mm to +/- 0.08 mm. Advantages import O-ring (O-ring) is to have excellent resistance to high pressure, high temperature, corrosion resistance, low temperature resistance, oil resistance, abrasion resistance and other properties. For most of the oil and solvent resistance have, especially aliphatic hydrocarbons, acids, aromatic hydrocarbons and animal and vegetable oils. Our import O-ring is produced in Taiwan, mainland China is the point of sale. White transparent silicone silicone rubber o-ring is the most common food-grade O-rings. Physical and chemical properties of silicone rubber: silicone material is obtained from the silicon element based on quartz, silicon atom by adhering saturated nonpolar rubber such as methyl, vinyl and other side chain formation. It can cause different side chain of silicone rubber having different characteristics. Methyl vinyl silicone rubber (VMQ) is the application of more of a silicone rubber O-rings silicone O-ring material. Food-grade silicone o-ring has excellent heat resistance, flexibility and particularly excellent resistance to oxidation and ozone low, with high selectivity and permeability of gas permeable. Good electrical insulating properties (volume resistivity greater than 1016 European .cm, breakdown voltage 30kv / mm or more), corona resistance and arc resistance. But adding conductive carbon black, nickel powder, aluminum powder, silver powder, but also have appropriate conductivity (volume resistivity up to 5-0.02 Europe .cm). Silicone rubber is hygroscopic, it can play a role in isolation. Water, but poor resistance to steam, pressure over 50psi above is not recommended. And is compatible with most solvent oil, chemicals. Generally silicone rubber acid resistance, resistance to polar solvent is acceptable, intolerance hydrogen and alkyl aromatic oils. Caustic soda solution is not recommended for use in most concentrated solvents, oils, concentrated acid and the diluted. Special silicone rubber is also resistant to radiation, fire, oil and other properties. Its low tensile strength, wear resistance is weak, generally not used for dynamic sealing.