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At an elevated temperature, metallic soaps can also result from a direct interaction of fatty acids with some metals, such as iron. This explains the corroding action of fatty acids on carbonsteel production equipment. The corroding action of fatty acids intensifies as the molecular weight of the acids decreases and the temperature increases, which is to be taken into consideration in selecting the grease production equipment. Stable soaps of trivalent metals, such as aluminium, as well as of higher valency metals cannot be produced by the above methods.

4 (H2O is removed as temparature Dissolves at 15-30 °C : at 100 °C : 5-9 g in 154 g in 100 g 100 g Al2(SO4)3 × K2SO4 × 24H2O Colorless complex salt; cubic or monoclinic crystals, well dissociated in water. 5 Pa (5 mm Hg). 5 Reacts, hydrolyzing to Al(OH)3. 0 rises) Aluminium Al(OC3H7)3 isopropylate Lead acetate Pb(CH3COO)2 White orthorombic or monoclinic crystals. × nH2O) (n = 1 ; 3 ; 10) “Saturn sugar”, Pb(CH3 COO)2 × 3H2O, is more often used in technology Well soluble DISPERSED PHASE OF LUBRICATING GREASES Calcium hydroxide at 85 °C : 280 g in 100 g Very well soluble 27 28 LUBRICATING GREASE MANUFACTURING TECHNOLOGY Li-, Na-, and K-greases are produced with the use of aqueous solutions of hydroxides of respective alkali metals, which are strong alkalis.

Vegetable oils [8-10]. Cottonseed and castor oils and, less often, sunflower and rapeseed oils are used in grease production in the erstwhile USSR. Abroad, apart from these oils, palm, coconut and some other oils are employed. , expression and extraction. Depending on the degree of refining, the oils are divided into refined and nonrefined ones. 6 [8-10]. Cottonseed, sunflower and rapeseed oils are primarily used in production of hydrated Ca-greases (fatty cup greases) and calcium-sodium greases, such as grease IP-1.