IP 37: Determination of acidity and alkalinity of lubricating grease

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  • Method adopted/last revised: 2004
  • Method reapproved: 2015
  • REF/ISBN: IP037-2937259
  • Status: Current
  • First printed in STM books: January 2004


This standard describes a method for the determination of free acid, free alkali and insoluble carbonates in calcium, sodium and lithium greases. It is not suitable for use when soaps of lead, zinc, aluminium or other weak bases are present, see note 1. Certain additives such as sodium nitrite interfere.

NOTE 1 - The soaps of weak bases react with potassium hydroxide and therefore the acidity of greases containing these materials cannot be directly determined.

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