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The penetration test on a grease measures its

  • A.resistance to oxidation
  • B.drop point in degrees
  • C.content of free alkali
  • D.consistency or hardness

Answer: D

A standard cone is allowed to sink into the sample and the depth in tenths of a millimetre is reported, which is the basis of the consistency numbering. A worked penetration on the same sample shows how the grease stands up to mechanical shearing.

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