News

PTFE oil seal features

Update:2018-11-27

Due to the different environmental and occasional conditions of the oil seal, the rubber seal material used in the oil seal has different media, which also determines the environment and occasions of the oil seal used and applied in the production and production. 

In the industry, The most common rubber seal materials for the development and production of oil seals, rubber include nitrile rubber, acrylate and fluoroelastomers materials, Sealing materials other than rubber can be selected from silicone rubber, polyurethane, hydrogenated nitrile rubber, and polytetrafluoroethylene (for oil seal lip parts).

First. Polytetrafluoroethylene is abbreviated as PTFE, generally referred to as “non-stick coating” or “easy to clean material”. This material is resistant to acids and bases and to various organic solvents and is almost insoluble in all solvents.

Second, what are the characteristics of the oil seal produced by PTFE?

PTFE has high chemical stability, good chemical inertness, strong acid and alkali or strong oxidant and organic solvent, etc.; good thermal stability, cracking temperature above 400 °C, wide operating temperature range It can work normally in the temperature range of -200-300 °C, in the case of ultra-low temperature, it is none of it; good wear-reducing property, the friction coefficient of PTFE seal materials is 0.1-0.2, and the metal The dry friction coefficient is 0.1-0.3, and it is 0.02-0.04 in the case of liquid lubrication. 

The dynamic and static friction coefficient is relatively small, and the static friction coefficient is almost the same as the dynamic friction coefficient. The surface of the PTFE seal material has outstanding surface self-lubricity, almost All viscous substances can not adhere to its surface; allow high-speed occasions and normal use of the environment, PTFE oil seal surface surface line speed can be as high as 30-33m / s, as long as there is splash oil lubrication and working environment, even up to 43m /s, rubber oil seals only allow <10m / s, and PTFE has a "memory" function.

Third. What industry sectors are used for the oil seals produced by PTFE?

PTFE oil seals are widely used in the weapon industry, aviation industry, hydraulic and pneumatic systems, oil pipes in oil industry, reciprocating and rotating shaft oil seals, and rubber elastomers to produce combined oil seals.