Rubber sealing rings are generally made of nitrile rubber, natural rubber, chloroprene rubber, ethylene propylene rubber, fluororubber, silicone rubber, and blended rubber. The sealing ring is mainly used to prevent oil, water, corrosion, and gas leakage.
According to the different materials used for sealing rings, there are different classifications in terms of properties:
1. High temperature resistant sealing ring, 2. High pressure resistant sealing ring, 3. Corrosion resistant sealing ring, 4. Wear resistant sealing ring
Comparison of Various Rubber Sealing Ring Materials
1、 NBR nitrile rubber sealing ring: suitable for use in petroleum hydraulic oil, glycol hydraulic oil, diester lubricating oil, gasoline, water, silicone grease, silicone oil and other media. It is currently the most widely used and cost-effective rubber seal. Not suitable for polar solvents such as ketones, ozone, nitrohydrocarbons, MEK, and chloroform. The general temperature range for use is -40~120 ℃.
2、 HNBR hydrogenated nitrile rubber sealing ring: It has excellent corrosion resistance, tear resistance, and compression deformation resistance, as well as good ozone resistance, sunlight resistance, and weather resistance. It has better wear resistance than nitrile rubber. Suitable for washing machinery, automotive engine systems, and refrigeration systems using a new environmentally friendly refrigerant R134a. It is not recommended to use in alcohol, ester, or aromatic solutions. The general temperature range for use is -40~150 ℃.
3、 SIL silicone rubber sealing ring: It has excellent heat resistance, cold resistance, ozone resistance, and atmospheric aging resistance. Has excellent insulation performance. But the tensile strength is worse than that of ordinary rubber and does not have oil resistance. Suitable for household appliances such as electric water heaters, irons, microwaves, etc. It is also suitable for various items that come into contact with the human body, such as water bottles, water dispensers, etc. It is not recommended to use in most concentrated solvents, oils, concentrated acids, and sodium hydroxide. The general temperature range for use is -55~250 ℃.
4、 VITON fluororubber sealing ring: It has better high-temperature resistance than silicone rubber, excellent weather resistance, ozone resistance, and chemical resistance, but poor cold resistance. It has resistance to most oils and solvents, especially acids, aliphatic hydrocarbons, aromatic hydrocarbons, and animal and vegetable oils. Suitable for sealing requirements of diesel engines, fuel systems, and chemical plants. It is not recommended to use in ketones, low molecular weight esters, and mixtures containing nitrate. The general temperature range for use is -20~250 ℃.
5、 FLS fluorosilicone rubber sealing ring: Its performance combines the advantages of fluorosilicone rubber and silicone rubber, with excellent oil resistance, solvent resistance, fuel oil resistance, and high and low temperature resistance. It can resist the erosion of oxygen-containing compounds, solvents containing aromatic hydrocarbons, and solvents containing chlorine. Generally used for aviation, aerospace, and military purposes. Manufacturers of rubber foam coils do not recommend exposure to ketones and brake oil. The general temperature range for use is -50~200 ℃.
6、 EPDM EPDM sealing ring: It has good weather resistance, ozone resistance, water resistance, and chemical resistance. It can be used for alcohols and ketones, as well as for sealing in high-temperature water vapor environments. Suitable for bathroom equipment, car radiators, and car brake systems. Not recommended for food use or exposure to mineral oil. The general temperature range for use is -55~150 ℃.
7、 CR chloroprene rubber sealing ring: It has excellent resistance to sunlight and weather. Not afraid of refrigerants such as dichlorodifluoromethane and ammonia, resistant to dilute acids and silicone grease lubricating oils, but with a large expansion in mineral oils with low aniline points. Easy to crystallize and harden at low temperatures. Suitable for various environments that come into contact with the atmosphere, sunlight, ozone, and various sealing links that are resistant to combustion and chemical corrosion. It is not recommended to use in chemicals such as strong acids, nitrohydrocarbons, esters, chloroform, and ketones. The general temperature range for use is -55~120 ℃.
8、 IIR butyl rubber sealing ring: It has excellent airtightness, heat resistance, sunlight resistance, ozone resistance, and good insulation performance; Has good resistance to polar solvents such as alcohols, ketones, esters, etc., and can be exposed to animal and vegetable oils or oxides. Suitable for chemical resistant or vacuum equipment. It is not recommended to use it together with petroleum solvents, kerosene, or aromatics. The general temperature range for use is -50~110 ℃.
9、 ACM acrylic rubber sealing ring: It has excellent resistance to oil, high temperature resistance, and weather resistance, but its mechanical strength, compression deformation rate, and water resistance are slightly poor. Generally used in automotive transmission systems and power steering systems. Not suitable for use in hot water, brake oil, and phosphate esters. The general temperature range for use is -25~170 ℃.
10、 NR natural rubber sealing ring: Rubber products have good wear resistance, elasticity, tensile strength, and elongation. But it is prone to aging in the air, becomes sticky when exposed to heat, expands and dissolves easily in mineral oil or gasoline, and is alkali resistant but not strong acid resistant. Suitable for use in liquids containing hydroxide ions such as automotive brake oil and ethanol. The general temperature range for use is -20~100 ℃.
11、 PU polyurethane rubber sealing ring: The mechanical properties of polyurethane rubber are very good, and its wear resistance and high pressure resistance are far superior to other rubbers. Aging resistance, ozone resistance, and oil resistance are also quite good, but they are easily hydrolyzed at high temperatures. Generally used in high-pressure and wear-resistant sealing processes, such as hydraulic cylinders. The general temperature range for use is -45~90 ℃.
For specific material choice, contact us. Since, above copy is only a brief introduction, and under each material, there are many subcategories. For example, common NBR is only resistant to 100 ℃, and only peroxide cure NBR can resistant to 120℃.