TC oil seal lips sealing principle:
1, since the oil seal between the shaft there is a seal edge and control of the film, this film has a fluid lubrication properties. Under the effect of the liquid surface tension, the stiffness of the film just to make the film in contact with air to form a crescent face end to prevent the leakage of the working medium, enabling the rotating shaft seal. Seal oil seal capacity, depending on the sealing surface of the oil film thickness, the thickness is too large, oil seal leak; thickness is too small, dry friction may occur, causing oil seal and shaft wear; no oil film between the sealing lip and the shaft, is easy to cause fever wear.
2, the installation must be painted on some oil seals, while ensuring oil seal and the axis perpendicular, if not vertical, lubricating oil seal sealing lip will be drained from the shaft, will lead to the sealing lip excessive wear. In operation, the lubricant inside the casing slightly leaking a little, in order to achieve the status of the oil film at the sealing surface is ideal.
 
material: mainly NBR, FKM
custom-made is welcome
The below is some specification and wholesale prices of TC oil seal: