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Molybdenum disulfide, a solid lubricant and friction reducer, colloidally dispersed in some oils and greases.

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COMPOUND

(1) chemically speaking, a distinct substance formed by the combination of two or more elements in definite proportions by weight and possessing physical and chemical properties different from those of the combining elements. (2) in petroleum processing, generally connotes fatty oils and similar materials foreign to petroleum added to lubricants to impart special properties.

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.

AERATION

The state of air being suspended in a liquid such as a lubricant or hydraulic fluid.

BLACK OIL

A lubricant containing asphaltic materials, which impart extra adhesiveness, that are used for open gears and steel cables.

AGGLOMERATE

The clustering together of a few or many particles into a larger solid mass.

ADHESION

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

ADHESION

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

ADSORPTION

Adhesion of the molecules of gases, liquids, or dissolved substances to a solid surface, resulting in relatively high concentration of the molecules at the place of contact; e.g. the plating out of an anti-wear additive on metal surfaces.

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.
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