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Two-way two solenoid valve sealing material which?

Two-way two-position solenoid valve sealing material is the most common three: NBR NBR, EPDM EPDM rubber, VITON fluorine rubber.
1, NBR NBR
By butadiene and acrylonitrile obtained by emulsion polymerization, nitrile rubber is mainly produced by low-temperature emulsion polymerization, excellent oil resistance, high wear resistance, good heat resistance, strong adhesion. The disadvantages are poor low temperature resistance, poor ozone resistance, poor electrical performance, and low elasticity.
In addition, it also has good water resistance, airtightness and excellent adhesive properties. Widely used in the manufacture of various oil-resistant rubber products, a variety of oil-resistant gaskets, gaskets, casing, flexible packaging, soft hoses, printing and dyeing rollers, cable adhesive materials, etc., which are essential in the automotive, aviation, petroleum, and photocopying industries. Elastic material.
Nitrile rubber has excellent oil resistance, its oil resistance is second only to polysulfide rubber and fluorine rubber, and has good 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 should not be used as an insulating material.
The main purpose:
Nitrile rubber is mainly used for making oil-resistant products such as oil-resistant pipes, adhesive tapes, rubber diaphragms, and large oil bladders. It is commonly used in the production of various types of oil-resistant molded products such as O-rings, oil seals, leather bowls, diaphragms, valves, and bellows. Etc., also used to make rubber sheets and wear parts.
2. EPDM EPDM rubber
EPDM rubber is a terpolymer of ethylene, propylene, and a non-conjugated diene. The most important feature of EPDM is its superior resistance to oxidation, ozone and corrosion. Since EPDM rubber belongs to the polyolefin family, it has excellent vulcanization properties. Among all rubbers, EPDM has the lowest specific gravity. It can absorb large amounts of fillers and oils without affecting the characteristics. Therefore, a low-cost rubber compound can be produced.
Molecular structure and characteristics:
Ethylene propylene glycol is a terpolymer of ethylene, propylene, and a non-conjugated diene. Diolefins have a special structure, only one of the two bonds can be copolymerized, unsaturated double bonds are mainly used as the link. The other unsaturation does not become the polymer backbone and only becomes a side chain. The main polymer chain of ethylene propylene diene is completely saturated. This feature makes EPDM resistant to heat, light, oxygen, and especially ozone. EPDM is essentially non-polar, resistant to polar solutions and chemicals, has low water absorption, and has good insulating properties.
3, VITON fluorine rubber
The fluorine-containing rubber in the molecule has various types depending on the fluorine content, that is, the monomer structure; it was first listed by the Dupont company under the trade name "VITON". The high temperature resistance is superior to the silicon rubber ... Chemical resistance, resistance to most oils and Solvents (except ketones, esters), weather resistance, ozone resistance are good, but the cold resistance is poor; generally widely used in seals, the use of temperature range -20 °C ~ 150 °C, low temperature requirements can be used when the low temperature type It can be applied to -40°C, which is high in price and best in overall performance. It is commonly called "rubber king".

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