IP 157: Determination of the oxidation stability of inhibited mineral oils (the TOST test)

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  • Method adopted/last revised: 1996
  • Method reapproved: 2011
  • REF/ISBN: IP157-2935231
  • Status: Current
  • First printed in STM books: January 1996


This standard specifies a method of evaluating the oxidation stability of inhibited turbine oils, hydraulic oils and circulating oils having a density less than that of water and containing rust and oxidation inhibitors, in the presence of oxygen, water and copper and iron metals, at an elevated temperature.

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