Description

一 Material advantages: polytetrafluoroethylene (PTFE) also known as Teflon or plastic king (F4), is a copolymer of tetrafluoroethylene monomer, it has the following advantages:

1.Chemical stability: almost all chemical resistance, strong acid, strong base or strong oxidant and organic solvent, etc. it is not effective.

2.Thermal stability: the cracking temperature is above 400℃, so it can work normally in the range of -60℃~+350℃.

3.Wear reduction: the friction coefficient of PTFE is only 0.02, which is 1/40 of rubber.

4.Self-lubricity: PTFE surface has outstanding self-lubricity, almost all viscous substances can not adhere to its surface.

二 Filling modification: because pure PTFE is not wear-resistant, to make it practical, it must be modified filling treatment.We adopt two methods: one is inorganic filling modification, adding glass fiber, carbon fiber, graphite, molybdenum disulfide and so on in PTFE. The other is organic filling modification, adding polyphenyl ester, polyphenylene sulfide in PTFE. By modification, the wear resistance of PTFE is increased by 2000 times, and the rigidity and thermal conductivity are increased, so that the oil seal can meet the requirements of high life.

三 Sealing principle: PTFE oil seal lip in the processing is pulled into a horn, because PTFE after pulling with memory shrinkage ability, friction heat generated in the work of the lip will constantly shrink, do not need the help of the spring, it will be tightly held on the shaft, do not let it and the shaft surface gap exists, and can compensate for wear.

四 Product advantages: PTFE oil seal has the following advantages compared with rubber oil seal:

1.Rubber oil seal with spring pressed lip mouth, and the shaft contact surface width is only 0.3-0.5mm, PTFE oil seal with no spring wide lip dynamic structure, and the shaft contact surface width of 5-7mm, so that you can maintain a sufficient oil film, and the shaft eccentric is not sensitive, in the radial runout of 0.4mm working conditions can still work normally.