Types and properties of sealing ring rubber 1. Nitrile butadiene rubber (NBR) The characteristics are: the wear resistance is particularly good, second only to polysulfide plastic and fluorine rubber. Good temperature resistance, good sealing, wear resistance and water resistance, and strong adhesion. The defects are: weak low temperature resistance and active oxygen resistance, low super strength and ductility, poor alkali resistance, poor electrical insulation performance, and weak resistance to polar solvents. Application temperature range: about -30℃～＋100 2. Silicone rubber (Si) The characteristics are: both heat resistance (maximum 300°C) and low temperature resistance (minimum -100°C); at the same time, the electrical insulation performance is excellent, the reliability of causticization and active oxygen is high, and the organic chemical plasticity is large. . The defects are: low impact toughness, poor acid and alkali resistance, water washing resistance and corrosion resistance. Application temperature: -60℃～+200℃. 3. Fluorine rubber (FKM) The characteristics are: high temperature resistance up to 300 ℃, corrosion resistance, wear resistance is the best in acid and alkali resistance rubber seals
products, radiation resistance, high temperature resistance vacuum pump characteristics; electrical insulation properties, physical properties, resistance to Solvent corrosion, active oxygen resistance, and air aging resistance are all high-quality. The defects are: poor process performance, expensive price, poor cold resistance, low ductility and breathability. Application temperature range: -20℃～＋200℃. 4. The characteristics of EPDM are: excellent resistance to active oxygen, ultraviolet light, weather resistance and aging resistance. It has very good electrical insulation performance, chemical resistance, impact ductility, corrosion resistance, small proportion, and can complete high filling and mutual coordination. High temperature resistance up to 150 ° C, resistance to polar solvents - ketones, esters, etc., but not resistant to hydrocarbon derivatives and aliphatic hydrocarbons. The defect is: self-adhesion and mutual adhesion are very poor, not easy to bond. Application temperature range: about -50℃～+150℃. 5. Esterified nitrile butadiene rubber seals (HNBR) The characteristics are: high impact toughness and wear resistance, better temperature resistance than NBR when chemically cross-linked with chloroprene, and other characteristics are the same as nitrile rubber. The disadvantage is: the price is high. Application temperature range: about -30℃～+150℃. 6. Natural rubber (NR) The characteristics are: large ductility, high tensile strength, high wear resistance and electrical insulation performance, excellent wear resistance and drought resistance, good process performance, easy to bond other raw materials, in the comprehensive energy level Better than most SBR. The defects are: poor resistance to oxygen and active oxygen, very easy to aging and qualitative change; acid and alkali resistance and water washing resistance are not very good, low ability to resist the corrosion of strong acid and alkali; temperature resistance is not high. Application temperature range: about -60℃～+80℃.
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