What are the sealing materials for solenoid valves?

There are three most commonly used sealing materials for solenoid valves.

NBR nitrile butadiene rubber

It is produced by emulsion polymerization of butadiene and acrylonitrile. Nitrile rubber is mainly produced by low-temperature emulsion polymerization. It has excellent oil resistance, high wear resistance, good heat resistance, and strong adhesion. The disadvantages are poor low temperature resistance, poor ozone resistance, poor electrical properties, and slightly lower elasticity.
In addition, it also has good water resistance, air tightness and excellent bonding properties. Widely used in the manufacture of various oil-resistant rubber products, a variety of oil-resistant gaskets, gaskets, casings, flexible packaging, flexible hoses, printing and dyeing rubber rollers, cable rubber materials, etc., becoming indispensable in industries such as automobiles, aviation, petroleum, and copying The elastic material.
Nitrile rubber has excellent oil resistance, its oil resistance is second only to polysulfide rubber and fluoro rubber, and it has abrasion resistance and air tightness. The disadvantage of nitrile rubber is that it is not resistant to ozone and aromatics, halogenated hydrocarbons, ketones and ester solvents, and it is not suitable for insulating materials.

The main purpose

Nitrile rubber is mainly used to make oil-resistant products, such as oil-resistant pipes, tapes, rubber diaphragms and large oil sacs, etc. It is often used to make various oil-resistant molded products, such as O-rings, oil seals, cups, diaphragms, valves, bellows, etc. It is also used to make rubber sheets and wear-resistant parts.

EPDM EPDM rubber

EPDM rubber is a terpolymer of ethylene, propylene and non-conjugated diene. Commercial production began in 1963. The annual consumption worldwide is 800,000 tons. The main feature of EPDM is its superior resistance to oxidation, ozone and corrosion. Since 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. Therefore, low-cost rubber compounds can be produced.

Molecular structure and characteristics: EPDM is a terpolymer of ethylene, propylene and non-conjugated diene. Diolefins have a special structure, only one of the two bonds can be copolymerized, and the unsaturated double bond is mainly used as a cross-chain. The other unsaturated one will not become the main polymer chain, but only the side chain. The main polymer chain of EPDM is fully saturated. This feature makes EPDM resistant to heat, light, oxygen, and especially ozone. EPDM is essentially non-polar, has resistance to polar solutions and chemicals, has low water absorption, and has good insulation properties.

Features
1. Low density and high filling;
2. Aging resistance;
3. Corrosion resistance;
4. Water vapor resistance;
5. Superheated water resistance;
6. Electrical performance;
7. Flexibility;
8. Adhesion.