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All greases can be used as lubricants, but not all lubricants are greases.
So, liquid or solid? Grease is a semi-liquid that can change its state depending on the conditions. The thickening agent in the grease absorbs the engine oil like a sponge. Under pressure or at high temperatures, the thickening agent expels the oil. The point at which the oil is expelled by the sponge and lubricates the parts is called the yield point.
Greases account for about 3% of total lubricant consumption and are widely used by all industries to lubricate bearings, gears, etc. Because of their consistency, they are often used as a lubricant in the manufacture of machinery.
Due to their consistency they are stable at rest and behave like a "solid". In service, under the action of loads, they react like a viscous liquid whose fluidity increases and approaches that of the base oil.
CONSTITUTION OF GREASES
Greases are obtained by dispersing thickening agents (soaps of metallic origin determining the physical properties: consistency...) in an "oil" (lubricating base representing 80 to 95% of the total mass) with or without additives. Graphite, molybdenum disulphide MoS2 ("extreme pressure"), dyes and fillers (talcum powder, etc.) are the most common additives.
Take the example of the grease used in a modern bearing: when the bearing is pressurised, the oil escapes from the matrix and provides lubrication. When the pressure is reduced, the matrix absorbs the oil again. This transformation property gives the grease a unique set of properties and applications.
Grease or oil
Both oil and grease are excellent lubricants for specific applications. They form a very effective team when used in a complementary manner.
To conclude
Grease consists of a thickening agent that absorbs the oil.
Grease is sometimes liquid, sometimes solid.
Oil and grease have different properties.
From door handles to bearings, grease has many applications.
Champion has a range of high quality greases.