Synonyms
Definition
In lubrication the solid to semifluid products of the dispersion of a thickening agent (thickener) in a liquid lubricant are called greases [1]. In most cases the thickener is a metal soap, and the grease contains additional compounds to improve performance. The transition from liquid to solid is fluid. Oils can already show structural viscosity with less than 5 % w/w of a thickener, but greases with a yield point usually contain from 5 % to 35 % w/w thickeners and, depending from demands, less than 1 % to 10 % and more % w/w additives.
There is no chemical or physical need to distinguish mineral oil-based, synthetic, and fully synthetic greases. None the less some authors call a grease synthetic when its base oil is not a mineral oil (see synthetic base oils), and others call a grease fully synthetic, when the thickener is synthetic, too.
History
It is possible that already the Sumerians had grease-like lubricants and used them in...
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References
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Further Reading
Klemgard EN (1937) Lubricating greases: their manufacture and use. Reinhold, New York
Boner CJ (1954) Manufacture and application of lubricating greases. Reinhold, New York
Boner CJ (1976) Modern lubricating greases. Scientific Publications, Broseley
Polishuk AT (1998) A brief history of lubricating greases. Grease Technology, Lima
Bartz WJ (2000) Schmierfette. Expert, Renningen-Malmsheim
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Dresel, W. (2014). Lubricating Greases. In: Mang, T. (eds) Encyclopedia of Lubricants and Lubrication. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-22647-2_16
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