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Solenoid valve sealing material currently has the three most commonly used. NBR butadiene rubber (nitrile butadiene rubber) by butadiene and acrylonitrile emulsion polymerization, the main use of low-temperature emulsion polymerization nitrile rubber production, excellent oil resistance, high wear resistance, heat resistance is better , Strong adhesion. The disadvantage is poor low temperature resistance, poor ozone resistance, poor electrical properties, slightly lower elasticity. In addition, it also has good water resistance, air tightness and excellent bonding properties. Widely used in the production of various kinds of oil-resistant rubber products, a variety of oil gaskets, gaskets, casing, flexible packaging, soft hoses, printing and dyeing rubber roller, cable adhesive materials, etc., in the automotive, aerospace, oil, photocopying and other industries become indispensable Elastic material. Nitrile rubber has excellent oil resistance, its oil resistance is second only to polysulfide rubber and fluorine rubber, and has the wear resistance and air tightness. The shortcomings of nitrile rubber is not resistant to ozone and aromatic, halogenated hydrocarbons, ketones and esters solvents, insulation materials should not be done. The main purpose of nitrile rubber is mainly used in the production of oil products, such as oil pipe, tape, rubber diaphragm and large oil capsules, commonly used in the production of various types of oil molded products, such as O-rings, oil seals, Bellows, etc., but also for the production of plastic sheeting and wear parts. EPDM Ethylene-Propylene-Diene Monomer Ethylene-propylene-diene terpolymer is a terpolymer of ethylene, propylene and nonconjugated diolefins. Commercially produced in 1963. The world's annual consumption is 800,000 tons. The main feature of EPDM is its superior resistance to oxidation, ozone and corrosion resistance. Because EPDM belongs to the polyolefin family, it has excellent vulcanization properties. Among all rubbers, EPDM has the lowest specific gravity. It can absorb a large amount of filler and oil without affecting the characteristics of small. Therefore, it is possible to produce a rubber compound that is inexpensive. Molecular Structure and Properties EPDM is a terpolymer of ethylene, propylene and non-conjugated dienes. Diene has a special structure, only one of the two key to copolymerization, unsaturated double bond is mainly as a cross-linked. The other unsaturated will not become the main polymer chain, will only become a side chain. The main polymer chain of EPDM is completely saturated. This feature makes EPDM can resist heat, light, oxygen, especially ozone. EPDM is essentially nonpolar, polar solution and chemical resistance, low water absorption, with good insulation properties. Features: 1, low density and high filling; 2, aging resistance; 3, corrosion resistance; 4, water vapor resistance; 5, resistance to hot water performance; 6, electrical properties; 7, flexibility; . VITON fluorine rubber (FKM) intramolecular fluorine-containing rubber, in accordance with the fluorine content of the monomer structure and there are various types; the current extensive use of hexafluoride fluorine rubber was first DuPont to "VITON" trade name. High temperature resistance is superior to silicone rubber, chemical resistance, resistance to most oils and solvents (except ketones and esters), good weatherability and ozone resistance, but poor cold resistance; generally widely used in steam locomotives, B Products, chemical plant seals, the use of temperature range of -20 ℃ ~ 260 ℃, low temperature requirements of the use of low temperature type can be used to -40 ℃, for higher prices.
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