Mechanical seal according to the use of different environment, sealing surface material is not the same, good sealing surface material can play a good role in promoting mechanical seal, mechanical seal auxiliary O-ring what material?
1, nitrile rubber NBR auxiliary mechanical seal O-ring: butadiene and acrylonitrile copolymerization of a synthetic rubber, with good oil resistance, wear resistance, aging resistance and air tightness, but ozone resistance, electrical insulation and cold resistance are relatively poor. (Mineral oil, animal and vegetable fats, aliphatic hydrocarbons have excellent corrosion resistance, widely used in contact with gasoline and other oil equipment, can resist alkali and non-oxidizing acid corrosion, not resistant to oxidizing acid {nitric acid, chromic acid}, aromatics, fat, ketone, ether, halogenated hydrocarbons corrosion, so rarely used as a mechanical seal auxiliary seal 'O' ring material)
Applicable temperature: -40℃~120℃. Powdered nitrile butadiene rubber (PNBR) : A new product developed for different applications.
2, EPDM rubber for mechanical seal: ethylene, propylene and non-conjugated diolefin terpolymer (mechanical seal 'O' ring almost do not use this material)
3, fluorine rubber (FPM2602, F26) for mechanical seal: with high temperature resistance, oil resistance, strong acid, alkali and corrosive media (mechanical seal 'O' ring commonly used materials)
Applicable temperature: -7℃~175℃
4, butyl rubber HR: mechanical seal 'O' ring almost do not use this material
Mechanical seal 'O' ring commonly used materials: fluororubber (FKM), perfluororubber (FFKM), nitrile butadiene rubber (NBR), double PTFE coated fluororubber, double PTFE coated ethylene propylene rubber, flexible graphite.