Melting point grease

Strontium hydroxide, Sr(OH)2, resembles slaked lime but is more soluble in water (21.83 g per 100 g of water at 100°C). It is a white dehquescent sohd with a specific gravity of 3.62 and a melting point of 375°C. Strontium soaps are made by combining strontium hydroxide with soap stocks, eg, lard, tallow, or peanut oil. The strontium soaps are used to make strontium greases, which are lubricants that adhere to metallic surfaces at high loads and are water-resistant, chemically and physically stable, and resistant to thermal breakdown over a wide temperature range (11). 

Lithium compounds are used in ceramics, lubricants, and medicine. Small daily doses of lithium carbonate are an effective treatment for bipolar (manic-depressive) disorder but scientists still do not fully understand why. Lithium soaps—the lithium salts of long-chain carboxylic acids—are used as thickeners in lubricating greases for high-temperature applications because they have higher melting points than more conventional sodium and potassium soaps. 

Low melting point Low boiling point Physically soft Malleable, not brittle Low electrical conductivity Dissolve in non-polar solvents Insoluble in polar solvents Ice melts in the mouth Molecular nitrogen is a gas at room temperature We use petroleum jelly as a lubricant Butter is easily spread on a piece of bread We insulate electrical cables with plastic3 We remove grease with methylated spiritb Polyurethane paint protects the window frame from rain... 

Recently new soaps have been found to improve greases with respect to melting point, adhesiveness, resistance to the washing action of water, and utility at both high and low temperatures. The newer thickeners are soaps of lithium 25) or barium 24) Certain properties of greases may be improved by saponification of the alkali with fats or fatty acids which have become available fairly recently these products include hydrogenated fats and pure fatty 13) acids such as 12-hydroxystearic acid. 

Lithium soaps, which have higher melting points than sodium and potassium soaps, are used as thickeners in lubricating greases for high-temperature applications. 

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