Wear
The attrition or rubbing away of the surface of a material as a result of mechanical action.

Wicking
The vertical absorption of a liquid into a porous material by capillary forces.

Worked Penetration
The penetration of a sample of lubricating grease immediately after it has been brought to 77°F and then subjected to 60 stokes in a standard grease worker. This procedure and the standard grease worker are described in ASTM Method D 217.


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