IP 239: Determination of extreme pressure and anti-wear properties of lubricating fluids and greases - Four ball method (European conditions)

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  • Method adopted/last revised: 2014
  • Method reapproved: None
  • REF/ISBN: IP239-2936900
  • Status: Current
  • First printed in STM books: February 2014


This standard specifies procedures for the measurement of the load carrying, anti-friction and anti-wear properties of lubricating oils and fluids and lubricating greases by means of the four ball machine, see note 1. The conditions of test are those that apply in Europe and other areas that have similar electrical supply characteristics (200 V to 250 V, 50 Hz). In North America, the conditions of test are slightly different, but provide a similar ranking of the lubricating properties of fluids. The test conditions are not intended to simulate particular service conditions, but to provide information over a range of standard conditions for the purpose of research, development, quality control and fluid ranking. The output is used in lubricant specifications.

NOTE 1 - The precision of this standard when testing lubricating greases has not been established.

NOTE 2 - In this standard the term kilogram (kg) is used to denote both the mass of weights used in the test and the resultant force applied (kgf). To express force in Newtons (N) use the relationship 1kgf = 9,806 N'

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