Introduction to the properties and applications of rubber sealing materials

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Material name code, performance characteristics, operating temperature (°C), main application areas: Natural rubber NR possesses excellent wear resistance, high elasticity, tensile strength, and elongation. However, it ages easily in air, becomes sticky when exposed to heat, expands and dissolves easily in mineral oil or gasoline, is resistant to alkalis but not to strong acids. -50–70 is commonly used as a raw material for manufacturing tapes, hoses, and strips, and it is suitable for producing shock-absorbing components as well as products used in liquids containing hydroxide ions such as automotive brake fluid and ethanol. Nitrile rubber NBR possesses excellent properties in terms of oil resistance, heat resistance, wear resistance, resistance to solvents, and resistance to high-pressure oils. But it is not suitable for use in polar solvents, such as ethers, ozone, nitrohydrocarbons, and chloroform. -40–120 is commonly used in the manufacture of fuel tanks and lubricant tanks, as well as in fluid media such as petroleum-based hydraulic oils, gasoline, water, silicone greases, silicone oils, diester-based lubricants, and glycol-based hydraulic oils. Hydrogenated nitrile rubber HNBR offers superior wear resistance, corrosion resistance, tensile strength, tear resistance, and compressional set compared to conventional nitrile rubber. It exhibits good resistance to ozone, sunlight, and other atmospheric conditions; however, it is not recommended for use in alcohol, ester, or aromatic solvents. -40–150 is commonly used in the air conditioning and refrigeration industry, and is widely employed as seals in environmentally friendly refrigerant R134a systems. Seals for automotive engine systems. Silicone rubber SIL boasts excellent heat resistance, cold resistance, ozone resistance, and resistance to atmospheric aging. It has excellent electrical insulation properties. Its tensile strength and wear resistance are poorer than those of ordinary rubber, and it has no oil resistance. -55–250 is commonly used for seals or rubber components in the household appliance industry, seals in food processing machinery, as well as seals in various products that come into contact with the human body. EPDM rubber boasts excellent weather resistance, aging resistance, ozone resistance, and chemical stability, and can withstand Freon as well as various refrigerants. -50–150 are commonly used for seals in high-temperature steam environments ； Seals or parts for plumbing fixtures ； As well as seals for refrigerators and cooling equipment, etc. Fluororubber FKM boasts excellent high-temperature resistance, as well as outstanding chemical resistance and resistance to most oils and solvents (except alcohols and esters). Its cold tolerance is rather poor. -20–220 is commonly used in high-temperature, chemically corrosive, and oil-resistant working environments; it finds wide application in industries such as metallurgy, chemical processing, automotive, and power generation. Butyl rubber IIR is impermeable to most common gases, exhibits good resistance to sunlight and ozone, and can be exposed to animal or vegetable oils as well as oxidizable chemicals. -55–100 is commonly used to make rubber parts for chemical-resistant and vacuum equipment. Neoprene CR has excellent elasticity, wear resistance, and resistance to atmospheric aging. It is resistant to severe twisting and is flame-retardant. It has stable chemical properties. -40–100 is suitable for manufacturing various components that are in direct contact with the atmosphere, sunlight, and ozone ； Suitable for various flame-resistant and chemically resistant rubber products. Polytetrafluoroethylene (PTFE) has excellent chemical stability; it is resistant to heat, cold, oil, water, steam, and various chemicals ； High mechanical strength, resistant to high pressure and wear ； Low friction coefficient and good self-lubrication. -55–260 is used for manufacturing wear rings, guide rings, and retaining rings. It is a commonly used sealing material in machinery and finds wide application in industries such as metallurgy, petrochemicals, construction machinery, and light industrial machinery. Polyurethane (PU) features high strength, excellent wear resistance, and good oil and solvent resistance. In particular, it exhibits good anti-swelling properties against lubricating oils and fuel oils, as well as good ozone resistance. But it cannot withstand high temperatures. -45–110 is used for manufacturing reciprocating motion seals and seals for various wear-resistant and high-strength applications. Perfluoroelastomer FFKM possesses excellent resistance to chemical agents and high temperatures, as well as the best heat resistance, chemical resistance, superior airtightness, and plasma resistance. However, it has poor low-temperature performance, high raw material costs, and significant difficulties in production and processing. -25–320 are resistant to various harsh chemical agents and high temperatures, and are commonly used in advanced fields such as semiconductors, healthcare, military, and aerospace.