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.