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A calcium base grease is unsuitable above about 80 degrees because it

  • A.loses the water that stabilises its structure
  • B.oxidises rapidly to an acidic residue
  • C.becomes too hard to be pumped
  • D.reacts chemically with the bearing metal

Answer: A

Calcium soap greases of the traditional type need a small proportion of water to hold the structure together, and losing it breaks the grease down. Its merits are cheapness and excellent resistance to washing out by water.

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