IP 37: Determination of acidity and alkalinity of lubricating grease
- Method adopted/last revised:
- Method reapproved: 2020
- REF/ISBN:
- Status: Current
- First printed in STM books: 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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