1. Natural rubber (NR) in the rubber hydrocarbon (polyisoprene) mainly containing a small amount of protein, moisture, resin acids, sugars and inorganic salts. Flexibility, high elongation strength, tear resistance and excellent electrical insulation, excellent wear resistance and drought tolerance, good workability, easy adhesion of other materials, synthetic rubber is better than most in terms of overall performance. The disadvantage is resistant to oxygen and ozone resistance is poor, easy to aging deterioration; oil and solvent resistance poor, low corrosion resistance to acid and alkali; high heat resistance. Operating temperature range: about -60 ℃ ~ + 80 ℃. Production of tires, rubber shoes, hose, tape, wire and cable insulation and jacketing, and other common products. Particularly suitable for the manufacture of torsional vibration eliminator, engine damper, the machine bearing, rubber - metal suspension components, diaphragms, molded products.
2. Nitrile butadiene rubber (NBR) of butadiene and acrylonitrile copolymer. Characterized by resistance to gasoline and oils of aliphatic hydrocarbons are particularly good performance, after polysulfide rubber, acrylic rubber and fluorine, and superior to other general rubber. Good heat resistance, air tightness, wear resistance and water resistance etc. good, strong bond. The disadvantage is the poor cold resistance and ozone resistance, strength and low elasticity, poor acid resistance, good electrical insulation properties, resistance to polar solvent resistance is also poor. Operating temperature range: about -30 ℃ ~ + 100 ℃. Mainly used in the manufacture of various oil products, such as hoses, sealing products.
3. Hydrogenated nitrile rubber (HNBR) of butadiene and acrylonitrile copolymer. It is through wholly or partially hydrogenated NBR butadiene double bond obtained. It features high mechanical strength and abrasion resistance when used peroxide crosslinking good heat resistance than NBR, nitrile rubber and other properties the same. The disadvantage is that higher prices. Operating temperature range: about -30 ℃ ~ + 150 ℃. Mainly used for oil, high temperature sealing products.
4. Ethylene-propylene rubber (EPM \ EPDM) copolymer of ethylene and propylene, are generally divided into EPR and EPDM. Is characterized by resistance to ozone, UV-resistant, weather resistance and excellent resistance to aging, ranking first in the general rubber. Electrical insulation, chemical resistance, impact good flexibility, acid, the proportion of small, can be highly filled with. Heat up to 150 ℃, resistance to polar solvents - ketones, esters, etc., but not resistant to aliphatic and aromatic hydrocarbons, other physical and mechanical properties slightly inferior to natural rubber and styrene-butadiene rubber is superior. The disadvantage is self-adhesive and mutual viscosity is poor, difficult to bond. Operating temperature range: about -50 ℃ ~ + 150 ℃. Mainly used for lining chemical equipment, wire and cable sheathing, steam hose, heat-resistant conveyor belts, automotive rubber products and other industrial products.
5. Silicone rubber (Si) based chain containing silicon and oxygen atoms of special rubber, which play a major role in the silicon element. Its main characteristic is both high temperature (up to 300 ℃) and low temperature (lowest -100 ℃), is the best Alto Ai cold, high temperature rubber; at the same time excellent electrical insulation, high stability against thermal oxidation and ozone , large chemical inertness. The disadvantage is the low mechanical strength, oil resistance, solvent and acid poor, difficult to cure, more expensive. Operating temperature: -60 ℃ ~ + 200 ℃. Mainly for the production of high temperature resistant products (hoses, seals, etc.), high temperature wire and cable insulation, because of its non-toxic and tasteless, but also for the food and medical industries.
6. Viton (FPM) is a copolymer of a fluorine-containing monomer from the organic elastomer. It features high temperature resistance up to 300 ℃, acid, oil is the best oil and rubber, anti-radiation, good resistance to high vacuum performance; electrical insulation, mechanical properties, chemical resistance, ozone resistance, resistance to atmospheric excellent in aging resistance. The disadvantage is poor processability, poor cold expensive, less elastic breathable. Operating temperature range: -20 ℃ ~ + 200 ℃. The sealing material is mainly used in the manufacture of aircraft defense industry, vacuum resistant rocket on high temperature resistance, chemical corrosion, hose or other parts and the automotive industry.
7. Acrylate rubber (ACM \ AEM) which is ethyl acrylate or butyl acrylate polymer. Its characteristics are both good heat resistance, oil resistance, lubricating oil containing sulfur, phosphorus, chlorine additive stable performance. At the same time aging resistance, oxygen and ozone, UV resistant, excellent air tightness. The disadvantage is poor resistance to cold, no water, steam and intolerant of organic and inorganic acids, alkalis. Severe swelling in a solution of a water-soluble alcohol, glycol, ketone esters. While the elastic and poor wear resistance, electrical insulation, poor, poor processing performance. Operating temperature range: about -25 ℃ ~ + 150 ℃. Can be used to make oil, heat, anti-aging products, such as seals, hoses, chemical linings.
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