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That property of a lubricant that produces low friction under conditions of boundary lubrication. The lower the friction, the greater the oiliness.

Related Terms

ABSORBER

That part of the low side of an absorption system, used for absorbing vapor refrigerant.

DETERGENT

In lubrication, either an additive or a compounded lubricant having the property of keeping insoluble matter in suspension thus preventing its deposition where it would be harmful. A detergent may also redisperse deposits already formed.

ADHESION

The property of a lubricant that causes it to cling or adhere to a solid surface.

REFRIGERATOR

A device to transfer heat from a low temperature to a high temperature medium.

HALF-TIDE LEVEL

A tidal datum midway between mean high water and mean low water. Mean sea level may coincide with half-tide level, but seldom does; the variation is generally about 3 centimeters and rarely exceeds 6 centimeters. Also called MEAN TIDE LEVEL.

HIGH WATER STAND

The condition at high water when there is no sensible change in the height of the water. A similar condition at low water is called LOW WATER STAND

BRIGHT STOCK

A heavy residual lubricant stock with low pour point, used in finished blends to provide good bearing film strength, prevent scuffing, and reduce oil consumption. Usually identified by its viscosity, SUS at 210°F or cSt at 100°C.

ASPERITIES

microscopic projections on metal surfaces resulting from normal surface-finishing processes. Interference between opposing asperities in sliding or rolling applications is a source of friction, and can lead to metal welding and scoring. Ideally, the lubricating film between two moving surfaces should be thicker than the combined height of the opposing asperities.

FILM STRENGTH

Property of a lubricant that acts to prevent scuffing or scoring of metal parts.

FRICTION

The resisting force encountered at the common boundary between two bodies when, under the action of an external force, one body, moves or tends to move relative to the surface of the other.
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