Commonly used solenoid valve sealing materials

Nitrile rubber has excellent oil resistance, its oil resistance is second only to polysulfide rubber seals and fluororubber, and has excellent wear resistance and air tightness. The disadvantage of NBR is that it is not resistant to ozone and aromatic, halogenated hydrocarbons, ketones and ester solvents, and is not suitable for insulating materials. Main uses Nitrile rubber is mainly used to make oil-resistant products, such as oil-resistant pipes, tapes, rubber diaphragms and large oil bladders, etc. It is often used to make various oil-resistant molded products, such as O ring manufactures, oil seals, leather cups, diaphragms, valves, Bellows, etc., are also used to make rubber seals sheets and wear-resistant parts. EPDM EPDM (Ethylene-Propylene-DieneMonomer) EPDM is a terpolymer of ethylene, propylene and non-conjugated dienes, which began commercial production in 1963. Annual worldwide consumption is 800,000 tons. The main characteristic of EPDM is its excellent resistance to oxidation, ozone and erosion. Since EPDM belongs to the polyolefin family, it has excellent vulcanization characteristics. Among all rubbers, EPDM has the lowest specific gravity. It can absorb large amounts of fillers and oils with little effect on properties. Therefore, a low-cost rubber seals compound can be produced. Molecular structure and properties EPDM is a terpolymer of ethylene, propylene and non-conjugated dienes. Diolefins have a special structure, only one of the two bonds can be copolymerized, and the unsaturated double bonds are mainly used as cross-links. The other unsaturated one will not become the polymer backbone, only the side chains. The main polymer chain of EPDM is fully saturated. This property makes EPDM resistant to heat, light, oxygen, and especially ozone. EPDM is nonpolar in nature, resistant to polar solutions and chemicals, has low water absorption, and has good insulating properties. Features: 1. Low density and high filling; 2. Aging resistance; 3. Corrosion resistance; 4. Water vapor resistance; 5. Superheated water resistance; 6. Electrical properties; 7. Elasticity; 8. Adhesion .
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