Difference between NBR Nitrile rubber and HNBR hydrogenated Nitrile rubber
Nitrile rubber is made from butadiene and acrylonitrile by lotion polymerization. Nitrile rubber is mainly produced by low-temperature lotion polymerization. It has excellent oil resistance, high abrasion resistance, good heat resistance and strong adhesion. Its disadvantages are poor low temperature resistance, ozone resistance, poor insulation performance, and poor elasticity. Nitrile rubber is mainly used to manufacture oil resistant rubber products. NBR, abbreviated as NBR, is a synthetic rubber produced by copolymerization of butadiene and acrylonitrile. It is a synthetic rubber with good oil resistance and aging resistance. The content of acrylonitrile (%) in Nitrile rubber is 42~46, 36~41, 31~35 and 25~30. The higher the content of acrylonitrile, the better the oil resistance, and the corresponding decrease in cold resistance. It can be used for a long time in air at 120 ℃ or in oil at 150 ℃. In addition, it also has good water resistance, air tightness, and excellent bonding performance. So it is widely used in the manufacturing of various oil resistant rubber products, various oil resistant washers, gaskets, sleeves, soft packaging, soft rubber pipes, cable adhesive materials, etc., and has become an essential elastic material in industries such as automobiles, aviation, and petroleum.
Hydrogenated Nitrile rubber (HNBR) is a highly saturated elastomer obtained by special hydrogenation of Nitrile rubber. Hydrogenated Nitrile rubber has good oil resistance; And due to its highly saturated structure, it has good heat resistance, excellent chemical corrosion resistance, excellent ozone resistance, and high resistance to compression permanent deformation; At the same time, hydrogenated Nitrile rubber also has high strength, tear resistance, wear resistance and other characteristics, and is one of the rubber with excellent comprehensive performance.
Compared with Nitrile rubber, hydrogenated Nitrile rubber has better heat resistance, higher tensile strength, low temperature resistance of -50 ℃, and good comprehensive performance. Conventional nitrile rubber can be used at a temperature of 100 ℃, while special formulas can be used at 150 ℃; The conventional use temperature of hydrogenated Nitrile rubber is 150 ℃, which can be made higher, depending on the formula and raw rubber.
Comparison: hydrogenated Nitrile rubber is generally applicable to the temperature range of -40 to 170 ℃; Service temperature of Nitrile rubber: 0-100 ℃;
HNBR150 ℃ environment can be used for a long time without stickiness, hardening and cracking, while Nitrile rubber cannot
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