1. Natural rubber (NR) is mainly composed of rubber hydrocarbon (polyisoprene), containing a small amount of protein, water, resin acid, sugar and inorganic salt. It has high elasticity, high tensile 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 comprehensive performance. The disadvantages are poor oxygen and ozone resistance, easy aging and deterioration; poor oil and solvent resistance, low acid and alkali corrosion resistance; low heat resistance. Operating temperature range: about -60℃ ~ +80℃. It is used to make tires, rubber shoes, hoses, tapes, insulation layers and sheaths of wires and cables and other general products. It is 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) Copolymer of butadiene and styrene. The performance is close to that of natural rubber. It is the most widely used general-purpose synthetic rubber. Its characteristics are that its wear resistance, aging resistance and heat resistance are better than those of natural rubber, and its texture is more uniform than that of natural rubber. The disadvantages are: low elasticity, poor flexure and tear resistance; poor processing performance, especially poor self-adhesion and low raw rubber strength. Operating temperature range: about -50℃～+100℃. It is mainly used to replace natural rubber to make tires, rubber sheets, rubber hoses, rubber shoes and other general products.

3. Butadiene rubber (BR) is a cis-structured rubber formed by the polymerization of butadiene. The advantages are: 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 low strength, poor tear resistance, poor processing performance and self-adhesion. Operating temperature range: about -60℃～+100℃. It is generally used in combination with natural rubber or styrene-butadiene rubber, mainly to make tire treads, conveyor belts and special cold-resistant products.

4. Isoprene rubber (IR) is a cis-structured rubber formed by the polymerization of isoprene monomers. Its chemical composition and stereostructure are similar to those of natural rubber, and its performance is also very close to that of natural rubber, so it is called synthetic natural rubber. It has most of the advantages of natural rubber, but its aging resistance is slightly lower than that of natural rubber, and its elasticity and strength are slightly lower than that of natural rubber, and its processing performance is poor, and its cost is relatively high. The operating temperature range is 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 formed by the emulsion polymerization of chloroprene as a monomer. This rubber molecule contains chlorine atoms, so compared with other general-purpose rubbers: it has excellent antioxidant and ozone resistance, is not flammable, can self-extinguish after ignition, is resistant to oil, solvents, acids and alkalis, aging, and has good air tightness; its physical and mechanical properties are also better than those of natural rubber, so it can be used as a general-purpose rubber or a special rubber. The main disadvantages are poor cold resistance, high specific gravity, high relative cost, poor electrical insulation, easy to stick to the roller, easy to burn and easy to stick to the mold during processing. In addition, the raw rubber has poor stability and is not easy to preserve. Operating temperature range: about -45℃～+100℃. It is mainly used to manufacture cable sheaths and various protective sleeves and protective covers that require high ozone resistance and aging resistance; oil-resistant and chemical-resistant hoses, tapes and chemical linings; flame-resistant underground mining rubber products, as well as various molded products, seals, gaskets, adhesives, etc.

6. Butyl rubber (IIR) is a copolymer of isobutylene and a small amount of isoprene or butadiene. The biggest feature is good air tightness, good ozone resistance and aging resistance, high heat resistance, and long-term working temperature below 130℃; it can resist strong inorganic acids (such as sulfuric acid, nitric acid, etc.) and general organic solvents, has good vibration absorption and damping properties, and very good electrical insulation. 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 shockproof products, heat-resistant conveyor belts, and heat-resistant aging tape products.

7. Nitrile rubber (NBR) is a copolymer of butadiene and acrylonitrile. The characteristics are that it is particularly resistant to gasoline and aliphatic hydrocarbon oils, second only to polysulfide rubber, acrylate and fluororubber, and 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℃. It is mainly used to manufacture various oil-resistant products, such as hoses, sealing products, etc.

8. Hydrogenated nitrile 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. When cross-linked with peroxide, it has better heat resistance than NBR. Other properties are the same as nitrile butadiene rubber. The disadvantage is that the price is relatively high. The operating temperature range is about -30℃ to +150℃. It is 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 ethylene propylene diene rubber and ethylene propylene diene rubber. It is characterized by excellent ozone resistance, UV resistance, weather resistance and aging resistance, ranking first among general-purpose rubbers. It has good electrical insulation, chemical resistance, impact elasticity, acid and alkali resistance, low specific gravity, and can be highly filled. It can withstand heat up to 150℃ and is resistant to polar solvents such as ketones and esters, but is 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. The operating temperature range is about -50℃ to +150℃. It is mainly used as chemical equipment lining, wire and cable sheath, steam hose, heat-resistant conveyor belt, automotive rubber products and other industrial products.

10. Silicone rubber (Q) is a special rubber with silicon and oxygen atoms in the main chain, among which the main role is played by silicon. Its main characteristics are that it is both resistant to high temperature (up to 300℃) and low temperature (minimum -100℃), and 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 and acid and alkali resistance, difficult to vulcanize, and expensive. Operating temperature: -60℃ to +200℃. It is mainly used to make high and low temperature resistant products (hoses, seals, etc.), high temperature resistant wire and cable insulation layers, and because it is non-toxic and odorless, it is also used in the food and medical industries.

11. Fluororubber (FPM) is an organic elastomer copolymerized from fluorine-containing monomers. Its characteristics are high temperature resistance up to 300°C, acid and alkali resistance, oil resistance is the best among oil-resistant rubbers, radiation resistance, high vacuum resistance; electrical insulation, mechanical properties, chemical corrosion resistance, ozone resistance, atmospheric aging resistance are excellent. Disadvantages are poor processability, high price, poor cold resistance, and low elasticity and air permeability. Use temperature range: -20°C ~ +200°C. Mainly used in the defense industry to manufacture vacuum-resistant, high-temperature-resistant, chemical-resistant sealing materials, hoses or other parts for aircraft and rockets, and the automotive industry.

12. Polyurethane rubber (AU\EU) is an elastomer polymerized from polyester (or polyether) and diisocyanate compounds. Its characteristics are good wear resistance, which is the best among various rubbers; high strength, good elasticity, and excellent oil resistance. It also has excellent ozone resistance, aging resistance, and air tightness. The disadvantages are poor temperature resistance, poor water resistance and alkali resistance, poor resistance to aromatic hydrocarbons, chlorinated hydrocarbons, ketones, esters, alcohols and other solvents. Use temperature range: about -30℃ ~ +80℃. It is used to make tire parts, gaskets, shockproof 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 lubricating oils 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 disadvantages are poor cold resistance, water resistance, steam resistance and organic and inorganic acids and alkalis. It swells severely in water-soluble solutions such as methanol, ethylene glycol, ketone esters, etc. At the same time, it has poor elasticity and wear resistance, poor electrical insulation, and poor processing performance. Use temperature range: about -25℃ ~ +180℃. It can be used to make oil-resistant, heat-resistant and aging-resistant products, such as seals, hoses, chemical linings, etc.

14. Chlorosulfonated polyethylene rubber (CSM) It is an elastic polymer obtained by chlorination and sulfonation of polyethylene. It has excellent ozone resistance and aging resistance, and its weather resistance is better than other rubbers. It has good flame retardancy, 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 that of styrene-butadiene rubber. The disadvantages are poor tear resistance and poor processing performance. The operating temperature range is about -20℃ to +120℃. It can be used as a sealing material on ozone generators to make oil-resistant seals, wire and cable sheaths, oil-resistant rubber products and chemical linings.

15. Chloroether rubber (CO\ECO) is a polymer formed by homopolymerization of epichlorohydrin or copolymerization of epichlorohydrin and ethylene oxide. It is characterized by excellent resistance to aliphatic hydrocarbon and chlorinated hydrocarbon solvents, alkali resistance, water resistance, and aging resistance, and has good ozone resistance, weather resistance, heat resistance, and high air tightness. The disadvantages are low strength, poor elasticity, and poor electrical insulation. The operating temperature range is about -40℃ to +140℃. It can be used as hoses, seals, films, container linings, oil tanks, rubber rollers, and oil seals and water seals.

16. Chlorinated polyethylene rubber (CM or CPE) is an elastic polymer made of polyethylene through chlorine substitution reaction. The performance is similar to that of chlorosulfonated polyethylene rubber. It 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. The operating temperature range is about -20℃ to +120℃. Wire and cable sheaths, hoses, tapes, rubber roller chemical linings, etc.