Discussion
Match the grease base with its limitation.
1. Calcium soap 2. Sodium soap 3. Bentonite clay
P. Washes out in the presence of water Q. Loses its structure above about 80 degrees R. Limited by oxidation of the oil rather than the thickener
Answer: C
Correct answer: 1-Q, 2-P, 3-R
Each thickener has its own weakness. Calcium soap loses its structure above about 80 degrees, since it depends on water of crystallisation. Sodium soap is water soluble and washes out where moisture is present. And a clay thickener has no melting point at all, so the limit is set by oxidation of the base oil instead.
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