Mechanical seals are used to support O-rings


The mechanical seal is different according to the appli […]

The mechanical seal is different according to the application environment, and the information of the sealing surface is different. The good o-ring sealing surface material can play an outstanding role in promoting the mechanical seal. What kind of raw materials does the mechanical seal assist the O-ring?
1. Nitrile rubber NBR assists mechanical seal O-ring: a synthetic rubber obtained by copolymerization of butadiene and acrylonitrile, which has outstanding oil resistance, wear resistance, aging resistance and air tightness, but ozone resistance. , electrical insulation and cold resistance are relatively poor. (Excellent corrosion resistance to mineral oils, animal and vegetable oils, aliphatic hydrocarbons, widely used in touch gasoline and other oil equipment, resistant to alkali and non-oxidizing dilute acid, not resistant to oxidizing acids {nitric acid, chromic acid} , aromatic hydrocarbons, fats, ketones, ethers, halogenated hydrocarbons, so it is rarely used as a mechanical seal to seal the "O" ring material).
Applicable temperature: -40 ° C ~ 120 ° C. Powdered nitrile rubber (PNBR): A new product that meets the needs of different uses.
2, EPDM rubber on the mechanical seal: is a terpolymer of ethylene, propylene and non-conjugated diene (mechanical seal "O" ring is simply not necessary)
3, fluorine rubber (FPM2602, F26) on mechanical seal: with high temperature, oil, strong acid, strong alkali and strong corrosive medium (common information of mechanical seal "O" ring)
Applicable temperature: -7 ° C ~ 175 ° C
4, butyl rubber HR: mechanical seal "O" ring is simply not necessary for this material
Common information for mechanical seal "O" ring: fluoroelastomer (FKM), perfluoroelastomer (FFKM), nitrile rubber (NBR), double PTFE coated fluororubber, double PTFE coated Ethylene propylene rubber, flexible graphite
Note: PTFE: PTFE, good heat, oil and corrosion resistance
Applicable temperature: -150 ° C ~ 250 ° C
O ring