This International Standard specifies the requirements for environmentally acceptable hydraulic fluids. It is applicable to hydraulic systems, particularly hydraulic fluid power systems. The purpose of this International Standard is to provide guidance for suppliers and users of environmentally acceptable hydraulic fluids, and to advise manufacturers of hydraulic systems.

This International Standard stipulates the requirements for environmentally acceptable hydraulic fluids at the time of delivery.

The classification of fluids used in hydraulic application is defined in ISO 6743-4. This International Standard encompasses only four of the categories of environmentally acceptable fluids covered by ISO 6743-4. These categories are HETG, HEPG, HEES and HEPR.