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Glossary of Terms

Abrasion – Mechanical wear during sliding of two surfacesagainst each other. Complex greases – Lubricating greases with thickenersproduced from metallic soaps with various acids. Particularly suitable for high temperatures and long- term applications. Consistency – A measure of the condition of lubricatinggreases. It is measured as the unworked and worked penetration and is indicated in accordance with the NLGI (National Lubricating Grease Institute). To simplify designation of the consistency of lubricating greases, the consistency range as a whole is divided into nine classes, measured as worked penetration, e.g Additives – Substances added in small amounts tolubricants to improve the performance. Density – The weight of a lubricant in grams per cm Adhesive lubricants – Lubricants with adhesion-improving components, which are not thrown off by centrifugal forces. See “Binder” Ageing resistance ASTM – American Society for Testing Materials. A-F Coating – Means anti-friction coating, the most commonand widely used type of dry solid lubrication of today. This group includes both air-dried and heat-cured materials. These formulations usually consist of a lubricating solid called the “pigment” and a bonding agent. – The resistivity against ageing whichmight occur due to oxidation, overheating, the presence of certain metals like copper, lead, silver etc. The resist- ance to ageing can be improved by certain additives (antioxidants). Auto-ignition point – The temperature at which an oilignites by itself, i.e. without the presence of a flame. Base oil – Basic component of lubricating oils and greases. Binder – An alternative term for non-volatile medium orvehicle and refers to the material which forms the varnish film and which in a paint or bonded coating binds the particles of solids (solid lubricants) together.
Consistency class Worked penetration (1/10 mm) Bonded lubricant – See A-F coating
00400-430 0355-385 Break away torque – Effective leverage turned intorotating movement to loosen a bolted connection.
1310-340 2265-295 Chemically inert – (Lubricant) not reacting chemically withcertain substances.
3 at 20ºC. Detergent – Agent for loosening and removing residuesand deposits from sliding surfaces. Coefficient of friction – Ratio of the frictional forcebetween two surfaces sliding across one another to the force that is perpendicular to the surfaces. Colloid – Small particles (10 Dispersion – Name given to two-substance systems inwhich one substance is contained in the other substance (liquid) in a dispersed form. Dynamic viscosity – A measure for inner friction duringflowing of a lubricating oil (e.g. flowing through pipes or clearances). DN value – A guide to the grease which should be used inrolling-element bearings depending upon their speed of rotation. It represents the shaft diameter in mm multiplied by the speed in revolutions per minute. Drop point EP additives – The drop point of a grease is that tempera-ture at which grease passes from a semisolid to a liquid state. It is a qualitative indication of the heat resistance of a grease’s thickener. The drop point temperature is determined when the first drop falls through the hole in the bottom of the cup during temperature increase. – Chemical substances to improve the pressureabsorption capacity and hence the wear resistance of oils and greases.
-5 to 10
-7 cm) in liquid whichbehave like a solution (no settling of particles). 49