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Rubber varieties (abbreviated symbols) Chemical composition, performance characteristics, main uses 1. Natural rubber (NR) is mainly rubber hydrocarbon (polyisoprene), containing a small amount of protein, moisture, resin acid, sugar and inorganic salts. It has high elasticity, high elongation strength, excellent tear resistance and electrical insulation, good wear resistance and drought resistance, good processability, easy to bond with other materials, and is superior to most synthetic rubbers in terms of overall performance. The disadvantage is that it has poor oxygen and ozone resistance and is prone to aging and deterioration. ； Poor oil and solvent resistance, low acid and alkali corrosion resistance ； The heat resistance is not high. Operating temperature range: About -60℃~+80℃. Production of tires, rubber shoes, hoses, tapes, insulation and sheathing of wires and cables, and other general products. Particularly suitable for the manufacture of torsional vibration eliminators, engine shock absorbers, machine supports, rubber-metal suspension components, diaphragms, and molded products. 2. Styrene-butadiene rubber (SBR) is a copolymer of butadiene and styrene. Its performance is close to that of natural rubber, and it is currently the most widely produced general-purpose synthetic rubber. Its characteristics are that its wear resistance, aging resistance and heat resistance exceed those of natural rubber, and its texture is also more uniform than natural rubber. The disadvantage is: Low elasticity, poor flexing and tear resistance ； Poor processing performance, especially poor self-adhesiveness and low raw rubber strength. Operating temperature range: About -50℃~+100℃. It is mainly used to replace natural rubber in the production of tires, rubber sheets, rubber hoses, rubber shoes and other general products. 3. Butadiene rubber (BR) is a cis-structured rubber polymerized from butadiene. The advantage is: It has excellent elasticity and wear resistance, good aging resistance, excellent low temperature resistance, low heat generation under dynamic load, and easy metal bonding. The disadvantages are lower strength, poor tear resistance, poor processing performance and self-adhesiveness. Operating temperature range: About -60℃~+100℃. It is generally used together with natural rubber or styrene-butadiene rubber, and is mainly used to make tire treads, conveyor belts and special cold-resistant products. 4. Isoprene rubber (IR) is a cis-structured rubber polymerized from isoprene monomer. The chemical composition and three-dimensional structure are similar to natural rubber, and its performance is also very close to natural rubber, so it is called synthetic natural rubber. It has most of the advantages of natural rubber. It is resistant to aging due to natural rubber, has slightly lower elasticity and strength than natural rubber, poor processing performance, and higher cost. Operating temperature range: About -50℃~+100℃ It can replace natural rubber to make tires, rubber shoes, hoses, tapes and other general products. 5. Chloroprene rubber (CR) is a polymer made of chloroprene as a monomer emulsion polymerization. This rubber contains chlorine atoms in its molecules, so compared to other general-purpose rubbers: It has excellent resistance to oxygen and ozone, is not flammable, can self-extinguish after catching fire, is resistant to oil, solvents, acids and alkalis, is resistant to aging, and has good air tightness. ； Its physical and mechanical properties are also better than natural rubber, so it can be used as general rubber or special rubber. The main disadvantages are poor cold resistance, large specific gravity, high relative cost, poor electrical insulation, and easy sticking, scorching and mold sticking during processing. In addition, raw rubber has poor stability and is difficult to store. Operating temperature range: About -45℃~+100℃. Mainly used to manufacture cable sheaths and various protective sleeves and protective covers that require high ozone resistance and aging resistance. ； Oil and chemical resistant hoses, tapes and chemical liners ； Flame-resistant rubber products for underground mining, as well as various molded products, sealing rings, pads, adhesives, etc. 6. Butyl rubber (IIR) is a copolymer of isobutylene and a small amount of isoprene or butadiene. The biggest features are good air tightness, good ozone resistance and aging resistance, high heat resistance, and the long-term working temperature can be below 130°C. ； It is resistant to inorganic strong acids (such as sulfuric acid, nitric acid, etc.) and general organic solvents, has good vibration absorption and damping properties, and has very good electrical insulation properties. The disadvantages are poor elasticity, poor processing performance, slow vulcanization speed, poor adhesion and oil resistance. Operating temperature range: About -40℃~+120℃. Mainly used as inner tubes, water tubes, balloons, wire and cable insulation layers, chemical equipment linings and shock-proof products, heat-resistant conveyor belts, and heat-aging resistant tape products. 7. Butadiene rubber (NBR) is a copolymer of butadiene and acrylonitrile. It is characterized by its particularly good resistance to gasoline and aliphatic hydrocarbon oils, second only to polysulfide rubber, acrylate and fluororubber, but better than other general-purpose rubbers. It has good heat resistance, good air tightness, wear resistance and water resistance, and strong adhesion. The disadvantages are poor cold resistance and ozone resistance, low strength and elasticity, poor acid resistance, poor electrical insulation, and poor resistance to polar solvents. Operating temperature range: About -30℃~+100℃. Mainly used to manufacture various oil-resistant products, such as hoses, sealing products, etc. 8. Hydrogenated butadiene rubber (HNBR) is a copolymer of butadiene and acrylonitrile. It is obtained by fully or partially hydrogenating the double bonds in butadiene of NBR. It is characterized by high mechanical strength and wear resistance, better heat resistance than NBR when cross-linked with peroxide, and other properties are the same as nitrile rubber. The disadvantage is that the price is higher. Operating temperature range: About -30℃~+150℃. Mainly used for oil-resistant and high-temperature resistant sealing products. 9. Ethylene-propylene rubber (EPM\\EPDM) is a copolymer of ethylene and propylene, generally divided into two-dimensional ethylene-propylene rubber and three-dimensional ethylene-propylene rubber. It is characterized by excellent ozone resistance, UV resistance, weather resistance and aging resistance, ranking first among general rubbers. It has good electrical insulation, chemical resistance, impact elasticity, acid and alkali resistance, small specific gravity, and can be used for high filling and matching. Heat resistance up to 150°C, resistance to polar solvents - isopropyl, ester, etc., but not resistant to aliphatic hydrocarbons and aromatic hydrocarbons. Other physical and mechanical properties are slightly inferior to natural rubber and better than styrene-butadiene rubber. The disadvantage is that the self-adhesion and mutual adhesion are very poor and it is not easy to bond. Operating temperature range: About -50℃~+150℃. Mainly used as chemical equipment linings, wire and cable sheaths, steam hoses, heat-resistant conveyor belts, automotive rubber products and other industrial products. 10. Silicone rubber (Q) is a special rubber containing silicon and oxygen atoms in the main chain, of which the silicon element plays a major role. Its main feature is that it is resistant to both high temperature (up to 300°C) and low temperature (minimum -100°C). It is currently the best cold-resistant and high-temperature resistant rubber. ； At the same time, it has excellent electrical insulation, high stability to thermal oxidation and ozone, and high chemical inertness. The disadvantages are low mechanical strength, poor oil resistance, solvent resistance, acid and alkali resistance, difficulty in vulcanization, and higher price. Use temperature: -60℃~+200℃. It is mainly used to make high and low temperature resistant products (hose, seals, etc.) and high temperature resistant wire and cable insulation layers. Because it is non-toxic and tasteless, it is also used in the food and medical industries. 11. Fluorine rubber (FPM) is an organic elastomer copolymerized by fluorine-containing monomers. Its characteristics are temperature resistance up to 300°C, acid and alkali resistance, oil resistance, which is the best among oil-resistant rubbers, and good radiation resistance and high vacuum resistance. ； It has excellent electrical insulation, mechanical properties, chemical corrosion resistance, ozone resistance, and atmospheric aging resistance. The disadvantages are poor processability, high price, poor cold resistance, and low elasticity and breathability. Operating temperature range: -20℃~+200℃. Mainly used in the national defense industry to manufacture vacuum-resistant, high-temperature-resistant, chemical-corrosion-resistant sealing materials, hoses or other parts on aircraft and rockets, and in the automotive industry. 12. Polyurethane rubber (AU\\EU) is an elastomer formed by polymerizing polyester (or polyether) and diisocyanate compounds. It is characterized by good wear resistance and is the best among various rubbers. ； High strength, good elasticity and excellent oil resistance. It is also excellent in ozone resistance, aging resistance, and air tightness. The disadvantages are poor temperature resistance, poor water resistance and alkali resistance, and poor resistance to aromatic hydrocarbons, chlorinated hydrocarbons and solvents such as homologs, esters and alcohols. Operating temperature range: About -30℃~+80℃. Tires are made from parts, gaskets, shock-proof products, and wear-resistant, high-strength and oil-resistant rubber products. 13. Acrylic rubber (ACM\\AEM) It is a polymer of ethyl acrylate or butyl acrylate. It is characterized by good heat resistance and oil resistance, and stable performance in lubricants containing sulfur, phosphorus and chlorine additives. At the same time, it is resistant to aging, oxygen and ozone, UV resistance, and excellent air tightness. The disadvantage is that it has poor cold resistance, is not resistant to water, steam and organic and inorganic acids and alkali. It swells severely in water-soluble solutions such as methanol, ethylene glycol, and isoesters. At the same time, it has poor elasticity and wear resistance, poor electrical insulation, and poor processing performance. Operating temperature range: About -25℃~+150℃. It can be used to manufacture oil-resistant, heat-resistant and aging-resistant products, such as seals, hoses, chemical linings, etc. 14. Chlorosulfonated polyethylene rubber (CSM) is an elastic polymer obtained by chlorination and sulfonation of polyethylene. It has excellent resistance to ozone and aging, and its weather resistance is better than other rubbers. It has good flame retardant, heat resistance, solvent resistance, resistance to most chemicals and acid and alkali resistance. The electrical insulation is acceptable, and the wear resistance is similar to styrene-butadiene rubber. The disadvantages are poor tear resistance and poor processing performance. Operating temperature range: About -20℃~+120℃. It can be used as sealing material on ozone generators to manufacture oil-resistant seals, wire and cable sheaths, oil-resistant rubber products and chemical linings. 15. Chloroether rubber (CO\\ECO) is a polymer made of epichlorohydrin homopolymer or copolymer of epichlorohydrin and ethylene oxide. It is characterized by resistance to aliphatic hydrocarbons and chlorinated hydrocarbon solvents, alkali resistance, water resistance, excellent aging resistance, ozone resistance, resistance to crickets and blade baths (2), high density, low H barium, low corrosion resistance, poor elasticity, poor electrical insulation, and a temperature of 0℃~+140℃. It can be used as hoses, seals, films and container linings, fuel tanks, rubber rollers, and manufacturing oil seals, water seals, etc. 16. Chlorinated polyethylene rubber (CM or CPE) is an elastic polymer made of polyethylene through a chlorine substitution reaction. Its performance is close to that of chlorosulfonated polyethylene rubber, which is characterized by good fluidity and easy processing. ； It has excellent weather resistance, ozone resistance and corona resistance, and good heat resistance, acid and alkali resistance and oil resistance. The disadvantages are poor elasticity, large compression deformation, and low electrical insulation. Operating temperature range: About -20℃~+120℃. Wire and cable sheathing, hose, tape, rubber roller chemical lining, etc.