The rubber sealing ring inside the pneumatic booster pump is an annular cover composed of one or several parts, which is fixed on one ring or washer of the bearing and contacts with another ring or washer or forms a narrow labyrinth gap to prevent the leakage of lubricating oil and the invasion of foreign objects. The sealing ring is a kind of rubber ring with circular cross section. Because its cross section is O-shaped, it is called O-shaped sealing ring.
1、 NBR nitrile rubber sealing ring
It is suitable for petroleum hydraulic oil, glycol hydraulic oil, diester lubricating oil, gasoline, water, silicone grease, silicone oil and other media. It is a rubber seal with wide application and low cost. It is not suitable for volatile solvents such as ketones, ozone, nitrohydrocarbons, MEK and chloroform. The general temperature range is - 40 ~ 120 ℃.
2、 HNBR hydrogenated nitrile rubber sealing ring
It has good corrosion resistance, tear resistance, compression resistance, ozone resistance, sunlight resistance and weather resistance. It has better abrasion resistance than NBR. It is suitable for washing machine and automobile engine system. It is not recommended to use in alcohol, ester or aromatic solution. The general temperature range is - 40 ~ 150 ℃.
3、 SIL silicone rubber sealing ring
It has good heat resistance, cold resistance, ozone resistance and atmospheric aging resistance. It has good insulation. But the tensile strength is worse than that of ordinary rubber and it has no oil resistance. Suitable for household appliances such as electric water heater, electric iron, microwave oven, etc. It is also suitable for all kinds of products that have contact with human body, such as kettle, water dispenser, etc. It is not recommended to use in most concentrated solvents, oil products, concentrated acids and sodium hydroxide. The general temperature range is - 55 ~ 250 ℃.
4、 Viton fluororubber sealing ring
High temperature resistance is better than silicone rubber, has good weather resistance, ozone resistance and chemical resistance, cold resistance is not good. It is resistant to most oils and solvents, especially acids, aliphatic hydrocarbons, aromatic hydrocarbons and animal and vegetable oils. It is suitable for sealing requirements of diesel engine, fuel system and chemical plant. It is not recommended for ketones, low molecular weight esters and mixtures containing nitrate. The general temperature range is - 20 ~ 250 ℃.
5、 FLS fluorosilicone rubber sealing ring
It has the advantages of both fluorine rubber and silicone rubber, and has good resistance to oil, solvent, fuel oil and high and low temperature. It can resist the erosion of oxygen-containing compounds, aromatic solvents and chlorine containing solvents. The general temperature range is - 50 ~ 200 ℃.
6、 EPDM EPDM sealing ring
It has good weather resistance, ozone resistance, water resistance and chemical resistance. Can be used for alcohols and ketones, also can be used for high temperature steam environment sealing. The general temperature range is - 55 ~ 150 ℃.
7、 CR chloroprene rubber sealing ring
It has good resistance to sunlight and weather. It is not afraid of dichlorodifluoromethane, ammonia and other refrigerants, resistant to dilute acid and silicone grease lubricating oil, but has large expansion in mineral oil with low aniline point. It is easy to crystallize and harden at low temperature. Suitable for all kinds of atmosphere, sunlight, ozone environment and all kinds of fire-resistant, chemical corrosion-resistant sealing links. It is not recommended to use in strong acids, nitrohydrocarbons, esters, chloroform and ketones. The general temperature range is - 55 ~ 120 ℃.