1 Scope

This document specifies an aging method for phosphate ester turbine control fluids. These products fall into category HFDR as specified in ISO 6743-4 and into categories TSD, TGD and TCD as specified in ISO 6743-5 . The amount of acid developed during the test is used to assess the level of anti-aging performance.

This document is applicable to the anti-aging performance determination for phosphate ester turbine control fluids that are both new and in-service.