30 November 2022

LUBRICANTS TERMINOLOGY

LUBRICANTS TERMINOLOGY

ABSORPTION : The process by which one substance draws another substance into itself.
ADDITIVE : A chemical compound or compounds added to the lubricant for the purpose of imparting new properties or to improve those properties which the lubricant already has.
ADHESION : The force or forces causing two materials to stick together.
ANTIOXIDENT :  A substance that retards the process of oxidation.
BALL BEARING : An antifriction bearing comprising rolling elements in the form of balls.
BASE STOCK :  Fully refined lube oil , which is a component of lubricant formulations.
BLEEDING : Tendency of a liquid component to separate from a solid or semisolid mixture as an oil from grease.
COEFFICIENT OF FRICTION : Ratio of the friction force between two bodies to the normal , or perpendicular, force between them.
COMPLEX GREASE : A lubricating grease thickened by a complex soap consisting of a normal soap and a complex agent.
DETERGENT : Either an additive or a compounded lub. Having a property of keeping insoluble matter in suspension, preventing its disposition.
DIELECTRIC STRENGTH : A measure of the ability of an insulating fluid to withstand electric stress (voltage) without failure.
DROPPING POINT OF GREASE : The temperature at which nthe grease passes from  a semisolid to a liquid state under specified test conditions.
DRY FILM LUBRICANT : Solid material left between two  moving surfaces to prevent metal to metal contact, thus reducing friction and wear.
FLASH POINT : The lowest temp. at which vapors arising from the oil will ignite momentarily when exposed to flame.
FRETTING CORROSION :  A process of mechanical attrition combined with chemical reaction in which  one or the more of the surfaces, or the wear particles thereof, react with their environment.
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 over the surface of the other.
INHIBITOR :  Any substance that slows or prevents chemical reaction or corrosion.
LUBRICANT : Any substance interposed between two surfaces in relative motion for reducing friction between them.
LUBRICATING GREASE :  A solid to semi fluid product consisting of dispersion of a thickening agent in a liquid lubricant.
MULTIGRADE OIL : An oil that meets the low temp. viscosity limits of one of the SAE W numbers as well as the 100 deg. C viscosity limits of one of the non – W members.
MULTIPURPOSE GREASE : A lubricating grease suitable to meet the various individual requirements.
NLGI : National lubricating grease institute.
OXIDATION STABILITY : Ability of a lubricant to resist natural degradation upon contact with oxygen.
PENETRATION :  The depth, in tenths of a millimeter, which a standard cone penetrates a solid or semi solid sample under specified conditions.
PUMPABILITY : The ability of a lubricating grease to flow under pressure through the line, nozzle and fitting of a grease dispensing system.
SLUDGE : Insoluble material formed as a result either of deterioration reactions in an oil or by contamination of oil, or both.
SOAP : The salt of a fatty acid.
STABILITY : Ability of a lubricant to resist natural degradation reactions upon exposure to UV radiation, heat and oxygen.
STATIC FRICTION : The friction between two surfaces not in relative motion but tending to slide over one another.
SYNTHETIC LUBRICANT : A lubricant produced from materials not naturally occurring in crude oil by either chemical synthesis or refining process.

 

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