1 Scope
This document specifies the minimum requirements for new mineral oil hydraulic fluids
and is intended for hydraulic systems, particularly for hydrostatic hydraulic fluid
power application. The purpose of this document is to guide suppliers and end users
of mineral oil hydraulic fluids and to direct equipment manufacturers of hydraulic
systems.
This document is written in a general form so that its application can accommodate
various climatic conditions. This document also stipulates the requirements for mineral-oil
hydraulic fluids at the time of delivery.
This document is intended to be used in conjunction with ISO 6743‑4, which classifies fluids used in hydraulic applications. Among the categories covered
by ISO 6743‑4, only five types of mineral oil-based fluids are covered in this document. These
categories are HH, HL, HM, HV and HG.
This document does not cover the extreme cases of use in terms of hydraulic circuits
design, temperature and extreme conditions.
NOTE For use in exceptional conditions, suppliers and purchasers of lubricants can mutually agree upon additional testing methods and acceptability criteria of the products.

