Mechanical seal according to the use of the environment is not the same, sealing surface information is not the same, good O-ring sealing surface information can play an outstanding role in promoting mechanical seal, mechanical seal auxiliary O-ring what raw materials?
1, nitrile rubber NBR with mechanical seal O-ring: butadiene and acrylonitrile copolymerization of a synthetic rubber, with outstanding oil resistance, wear resistance, aging resistance and air tightness, but ozone resistance, electrical insulation and cold resistance are relatively poor. (Mineral oil, animal and plant fats, aliphatic hydrocarbons have excellent corrosion resistance, widely used to touch gasoline and other oil equipment, can resist alkali and non-oxidizing acid corrosion, not resistant to oxidizing acid {nitric acid, chromic acid}, aromatic, fat, ketone, ether, halogenated hydrocarbons corrosion, so rarely used as a mechanical seal auxiliary sealing "O" ring raw materials).
Applicable temperature: -40℃~120℃. Powdered nitrile butadiene rubber (PNBR) : A new product developed for different uses.
2, EPDM rubber on mechanical seal: ethylene, propylene and non-conjugated diolefin terpolymer (mechanical seal "O" ring simply do not need this material)
3, fluorine rubber (FPM2602, F26) About mechanical seal: with high temperature resistance, oil resistance, strong acid, alkali and corrosive media (mechanical seal "O" ring commonly used information)
Applicable temperature: -7℃~175℃
4, butyl rubber HR: mechanical seal "O" ring simply do not need this material
Mechanical seal "O" ring common information: fluorine rubber (FKM), perfluoro rubber (FFKM), nitrile rubber (NBR), double PTFE coated fluorine rubber, double PTFE coated ethylene propylene rubber, flexible graphite
Note: PTFE: polytetrafluoroethylene, heat resistance, oil resistance, corrosion resistance
Applicable temperature: -150℃~250℃