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RS ISO 11158: 2023
Lubricants, industrial oils and related products (class L) — Family H (hydraulic systems) — Specifications for categories HH, HL, HM, HV and HG

Abstract

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 oilbased
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.

General Information

Code	Classification	Theme	Pages	Publisher	Availability
RS ISO 11158: 2023	ADOPTED ISO STANDARDS	Petroleum and related technologies	29	Third Edition	Available