ISO 4263-4:2006

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Petroleum and related products - Determination of the ageing behaviour of inhibited oils and fluids - TOST test - Part 4: Procedure for industrial gear oils

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ISO 4263-4:2006

Petroleum and related products - Determination of the ageing behaviour of inhibited oils and fluids - TOST test - Part 4: Procedure for industrial gear oils

PUBLISH DATE 2006
ISO 4263-4:2006

ISO 4263:2006 specifies a method for the determination of the ageing behaviour of gear oils of categories CKC, CKD, CKS, and CKT as defined in ISO 6743-6.

The ageing is accelerated by the presence of air and elevated temperatures, and the degradation of the oil is assessed by the change in:

  • kinematic viscosity at 100 °C,
  • insoluble content (precipitation number),
  • possibly the acid number increase,
  • sediment content by filtration,
  • additives content variation, and
  • infra-red oxidation.
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