5 ethylene propylene rubber EPDM
(Ethylene propylene Rubber) by the polymerization of ethylene and propylene were the main chain of sub-strands, so heat resistance, aging resistance, ozone resistance, stability are very good, but not sulfur and sulfur. To solve this problem, the main chain in the EP have to import a small amount of the third component which can be double-stranded sulfur and sulfur Serve EPDM, the general temperature range of -50 ~ 150 ℃. Polar solvents such as alcohols, ketones, ethylene glycol and lipid phosphate excellent resistance to hydraulic oil. Advantages: with good resistance to ozone resistance and climate with excellent water resistance and chemical resistance to alcohols and ketones using high temperature steam, the gas permeability is not a good Disadvantages: - not recommended for food use or being exposed to aromatic hydrogen. * High temperature water vapor environment seal. * Sanitary equipment seals or parts. * Brake (brake) system rubber parts. * Radiator (auto water tank) in the seals.
6. Nitrile rubber NBR
(Nitrile Rubber) from the total of acrylonitrile and butadiene polymerization, acrylonitrile content from 18% to 50%, the higher the acrylonitrile content, the petrochemical oil hydrocarbon fuel oil resistance as possible, but the low temperature performance is variation, the general temperature range of -25 ~ 100 ℃. NBR rubber for the current O-ring seals and rubber the most commonly used one. Advantages: with good resistance to oil, water-resistant, anti-solvent and anti-high-pressure characteristics of the oil. * With good compression distortion, wear and elongation strength. Disadvantages: - not suitable for polar solvents being, such as ketones, ozone, nitro hydrocarbons, MEK and chloroform. * For the production of the fuel tank, oil tank and hydraulic oil in the oil lines, gasoline, water, silicone grease, silicone, diester series lubricating oil, hydraulic oil, glycol system in the fluid medium used rubber parts, especially seals parts. Can be said is the most widely used and lowest cost of rubber seals.
7. Neoprene CR
(Neoprene, Polychloroprene) from the chlorine butene monomer polymerization. Vulcanized rubber elasticity wear resistance, are not afraid of direct sunlight, there is a particularly good resistance to atmospheric aging, afraid of the intense distortion, not afraid of dichlorodifluoromethane and ammonia refrigerant, anti-acid, anti-silicone ester system lubricants, but the impatience of phosphate ester hydraulic oil system. Easy to crystallize at low temperature, hardening, storage stability is poor in mineral oil with low aniline point in the expansion volume. General temperature range of -50 ~ 150 ℃ advantages: good elasticity and a good compression. * The recipe does not contain sulfur, so it is easy to make with the characteristics of anti-animal and vegetable oil will not be neutral chemicals, fatty esters, oils, various oils, solvents affect the properties of a flame features Disadvantages: - does not recommend the use of strong acid, nitro hydrocarbons, esters, ketones, chloroform, and among the chemicals. * R12 refrigerant-resistant seals. * Household appliances on the rubber parts or seals. * Suitable for production of direct contact with the atmosphere, sunlight, ozone components. • Suitable for all kinds of fire, chemical corrosion-resistant rubber.
8. Chlorosulfonated polyethylene rubber CSM
(Hypalon, Polyethylene) CSM for the DuPont patented synthetic rubber. Heat resistance, weather resistance, ozone resistance were good; acid is also good, drugs commonly used in anti-oxidation (nitric acid, sulfuric acid) of the Department, the general temperature range of -45 ~ 120 ℃. Advantages: • ozone, oxidation and has good flame resistance and physical properties similar to neoprene and has a better acid resistance with excellent resistance to abrasive and nitrile rubber surface for the same low-friction oil between agents and solvent resistant neoprene and nitrile rubber is recommended between the water to prevent leakage Disadvantages: - not recommended for exposure to concentrated oxidizing acids, nitro hydrocarbons, esters, ketones and aromatic hydrogen .
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