1, natural rubber (NR)
It is mainly composed of rubber hydrocarbon (polyisoprene) and contains a small amount of protein, moisture, resin acid, sugar and inorganic salts. 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 overall performance. The disadvantages are poor oxygen and ozone resistance, easy aging and deterioration; poor oil and solvent resistance, low acid and alkali corrosion resistance; and low heat resistance.
Operating temperature range: approximately -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)
A copolymer of butadiene and styrene, with properties close to natural rubber. It is currently the highest-volume general-purpose synthetic rubber. Its abrasion, aging and heat resistance exceed natural rubber, and its texture is more uniform. Disadvantages include lower elasticity, poorer flex-fatigue and tear resistance, and poor processing characteristics, especially low self-adhesion and low raw-rubber strength. Its operating-temperature range is approximately -50℃ to +100℃. It is mainly used instead of natural rubber for tires, rubber sheets, hoses, footwear and other general-purpose products.
3, butadiene rubber (BR)
It is a cis-structured rubber polymerized from 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 lower strength, poor tear resistance, poor processing performance and self-adhesiveness. Operating temperature range: approximately -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)
It is a cis-structured rubber produced by polymerizing isoprene monomers. Its chemical composition and stereochemical structure resemble those of natural rubber, and its properties are also very close, hence the name synthetic natural rubber. It has most of the advantages of natural rubber and better aging resistance, but slightly lower resilience and strength, poorer processing performance and higher cost. Operating temperature range: approximately −50°C to +100°C. It can replace natural rubber in tires, rubber footwear, hoses, belts and other general-purpose products.
5, neoprene (CR)
It is a polymer produced by emulsion polymerization using chloroprene as the monomer. Because the rubber molecules contain chlorine atoms, it offers advantages over other general-purpose rubbers, including excellent oxidation and ozone resistance, low flammability, self-extinguishing behavior after ignition, resistance to oil, solvents, acids, alkalis, and aging, and good airtightness. Its physical and mechanical properties are also better than those of natural rubber, so it can serve as either a general-purpose or specialty rubber. Its main disadvantages are relatively poor cold resistance, high specific gravity, relatively high cost, poor electrical insulation, and a tendency to stick to rolls, scorch, and stick to molds during processing.
In addition, raw rubber has poor stability and is difficult to store. Operating temperature range: approximately -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 rubber products for underground mining, as well as various molded products, sealing rings, pads, adhesives, etc.
6, butyl rubber (IIR)
It is a copolymer of isobutylene and a small amount of isoprene or butadiene. Its biggest features are good air tightness, good ozone resistance, good aging resistance, high heat resistance, long-term working temperature can be below 130℃; it can withstand 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: approximately -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, nitrile rubber (NBR)
Copolymer of butadiene and acrylonitrile. It is characterized by particularly good resistance 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: approximately -30℃~+100℃.
Mainly used to manufacture various oil-resistant products, such as hoses, sealing products, etc.
8, hydrogenated butadiene rubber (HNBR)
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: approximately -30℃~+150℃. Mainly used for oil-resistant and high-temperature resistant sealing products.
9, ethylene propylene rubber (EPM\\EPDM)
The copolymer of ethylene and propylene is 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 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. The heat resistance can reach 150℃, and it is resistant to polar solvents - ketones, esters, etc., but it is not resistant to aliphatic hydrocarbons and aromatic hydrocarbons. Its 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: approximately -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)
A special rubber containing silicon and oxygen atoms in the main chain, of which silicon plays a major role. Its main feature is that it is resistant to both high temperature (maximum 300℃) and low temperature (minimum -100℃). It is currently the best