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A non-soap grease may be thickened with

  • A.calcium or sodium soap
  • B.a soluble oil emulsion
  • C.a volatile solvent that evaporates
  • D.bentonite clay or fine silica

Answer: D

Correct answer: bentonite clay or fine silica

A non-soap grease uses an inorganic thickener - modified bentonite or finely divided silica - which has no melting point, so the grease has effectively no drop point and is limited instead by the oxidation of the base oil. That makes such greases the choice for high temperature service.

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