The base fluid, usually a refined petroleum fraction or a selected synthetic material, into which additives are blended to produce finished lubricants.


Related Terms

OIL CUP

A permanently mounted cup used to feed lubricant to a gear, usually with some means of regulating the flow.

LOW-PRESSURE AREA

The point in a bearing where the pressure is the least and the area or space for a lubricant is the greatest.

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.

ADHESION

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

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.

FILM STRENGTH

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

EP (EXTREME PRESSURE) LUBRICANTS

Lubricants that impart to rubbing surfaces the ability to carry appreciably greater loads than would be possible with ordinary lubricants without excessive wear or damage.

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