EN ISO 12922:2020

Lubricants, industrial oils and related products (class L) - Family H (Hydraulic systems) - Specifications for hydraulic fluids in categories HFAE, HFAS, HFB, HFC, HFDR and HFDU (ISO 12922:2020)

This document specifies the minimum requirements of unused fire-resistant and less flammable hydraulic fluids for hydrostatic and hydrodynamic systems in general industrial applications. It is not intended for use in aerospace or power-generation applications, where different requirements apply. It provides guidance for suppliers and end users of these less hazardous fluids and to the manufacturers of hydraulic equipment in which they are used.
Of the categories covered by ISO 6743-4, which classifies the different types of fluids used in hydraulic applications, only the following are detailed in this document: HFAE, HFAS, HFB, HFC, HFDR and HFDU.
Types HFAE, HFAS, HFB, HFC and HFDR are "fire-resistant" fluids as defined by ISO 5598. Most HFDU fluids, while displaying an improvement in combustion behaviour over mineral oil, fall outside this definition and are more appropriately considered as "less flammable" fluids.

Schmierstoffe, Industrieöle und verwandte Produkte (Klasse L) - Familie H (Hydraulische Systeme) - Anforderungen an Druckflüssigkeiten in den Kategorien HFAE, HFAS, HFB, HFC, HFDR und HFDU (ISO 12922:2020)

Dieses Dokument legt die Mindestforderungen an unbenutzte schwer entflammbare und weniger leicht entflammbare Druckflüssigkeiten für hydrostatische und hydrodynamische Systeme in allgemeinen industriellen Anwendungen fest. Es ist nicht für die Anwendung in der Luft- und Raumfahrt oder Energieerzeugung vorgesehen, wo andere Anforderungen gelten. Dieses Dokument gibt Leitlinien sowohl für Lieferanten und Endverbraucher dieser weniger gefährlichen Flüssigkeiten als auch für Hersteller hydraulischer Ausrüstung, in der die Flüssigkeiten eingesetzt werden.
ISO 6743 4 klassifiziert die unterschiedlichen Fluide für Anwendungen in der Fluidtechnik. Von den durch diese Norm abgedeckten Kategorien werden in diesem Dokument nur folgende Kategorien von Druckflüssigkeiten detailliert behandelt: HFAE, HFAS, HFB, HFC, HFDR und HFDU.
Die Typen HFAE, HFAS, HFB, HFC und HFDR sind „schwer entflammbare“ Flüssigkeiten wie in ISO 5598 definiert. Die meisten HFDU-Flüssigkeiten zeigen zwar eine Verbesserung des Verbrennungsverhaltens gegenüber Mineralölen, fallen aber nicht unter diese Definition und es ist eher angemessen sie als „weniger leicht entflammbare Flüssigkeiten“ zu bezeichnen.

Lubrifiants, huiles industrielles et produits connexes (classe L) - Famille H (Systèmes hydrauliques) - Spécifications applicables aux fluides hydrauliques des catégories HFAE, HFAS, HFB, HFC, HFDR et HFDU (ISO 12922:2020)

Le présent document spécifie les exigences minimales relatives aux fluides hydrauliques neufs résistant au feu et difficilement inflammables, destinés aux systèmes hydrostatiques et hydrodynamiques dans les applications industrielles générales. Elle ne s'applique pas aux applications du domaine aéronautique ou de la production d'électricité qui nécessitent d'autres exigences. Elle fournit des informations aux fournisseurs et aux utilisateurs finaux de ces fluides peu dangereux ainsi qu'aux fabricants des équipements hydrauliques dans lesquels ces fluides sont utilisés.
Parmi les catégories couvertes par l'ISO 6743‑4, qui classe les différents types de fluides utilisés dans les applications hydrauliques, seules les suivantes sont détaillées dans le présent document: HFAE, HFAS, HFB, HFC, HFDR et HFDU.
Les types HFAE, HFAS, HFB, HFC et HFDR sont des fluides «résistant au feu» selon l'ISO 5598. La plupart des fluides HFDU, bien qu'ayant un meilleur comportement de combustion que l'huile minérale, n'entrent pas dans cette définition et sont plutôt considérés comme des fluides "difficilement inflammables".

Maziva, industrijska olja in sorodni proizvodi (skupina L) - Podskupina H (hidravlični sistemi) - Specifikacije za hidravlične tekočine kategorij HFAE, HFAS, HFB, HFC, HFDR in HFDU (ISO 12922:2020)

General Information

• Status: Published
• Publication Date: 25-Feb-2020
• Withdrawal Date: 30-Aug-2020
• ICS: 75.120 - Hydraulic fluids
• Technical Committee: CEN/TC 19 - Petroleum products, lubricants and related products
• Drafting Committee: CEN/TC 19 - Petroleum products, lubricants and related products
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 26-Feb-2020
• Completion Date: 26-Feb-2020
• Ref Project: SIST EN ISO 12922:2020 - Lubricants, industrial oils and related products (class L) - Family H (Hydraulic systems) - Specifications for hydraulic fluids in categories HFAE, HFAS, HFB, HFC, HFDR and HFDU (ISO 12922:2020)

Relations

• Replaces: EN ISO 12922:2012 - Lubricants, industrial oils and related products (class L) - Family H (Hydraulic systems) - Specifications for hydraulic fluids in categories HFAE, HFAS, HFB, HFC, HFDR and HFDU (ISO 12922:2012)
• Effective Date: 10-Oct-2018

Overview

EN ISO 12922:2020 (ISO 12922:2020) specifies minimum requirements for unused fire-resistant and less flammable hydraulic fluids used in hydrostatic and hydrodynamic systems for general industrial applications. It covers the hydraulic-fluid categories HFAE, HFAS, HFB, HFC, HFDR and HFDU (as classified in ISO 6743-4). The standard is intended for suppliers, end users and manufacturers of hydraulic equipment and provides guidance on selection, testing and basic properties of these safer fluids. Not intended for aerospace or power-generation applications.

Key topics and technical requirements

• Scope and definitions - Clarifies which fluid categories are covered and distinguishes “fire-resistant” (HFAE, HFAS, HFB, HFC, HFDR) from “less flammable” (mostly HFDU) fluids per ISO 5598 vocabulary.
• Minimum performance requirements - Specifies baseline characteristics that unused fluids must meet for industrial use (e.g., compatibility, stability, corrosion and oxidation behaviour).
• Sampling and test methods - References standardized test procedures for key properties, including:
  • Water content determination (Karl Fischer; ISO 760 and related methods)
  • Oxidation/ageing tests (TOST procedures for HFC/HFDU references)
  • Corrosion resistance and rust prevention (ISO 4404 series, ISO 7120)
  • Emulsion stability, foaming, pH, anti-wear and FZG scuffing tests (referenced ISO methods)
  • Flammability assessments (spray ignition, wick flame persistence, manifold ignition tests)
• Design and material considerations - Notes that some fire‑resistant fluids contain water or synthetic chemistries and may require system design changes; elastomer compatibility must be checked (ISO 6072).

Practical applications

• Selection and specification of hydraulic fluids for industries where fire risk must be reduced (manufacturing plants, material‑handling, mining, steel mills).
• Procurement and quality control by lubricant suppliers and distributors to meet EN ISO 12922:2020 acceptance criteria.
• Guidance for hydraulic equipment manufacturers and maintenance engineers on compatibility, system modification needs and testing regimes when using non‑mineral or water‑containing fluids.

Who uses this standard

• Lubricant and hydraulic fluid manufacturers
• Hydraulic equipment designers and OEMs
• Maintenance and reliability engineers
• Safety managers and procurement teams specifying fire‑resistant/low‑flammability fluids

Related standards

• ISO 6743-4 (fluid classification)
• ISO 5598 (vocabulary)
• ISO 7745 (use guidelines for FR fluids)
• Test standards referenced in EN ISO 12922:2020 (e.g., ISO 760, ISO 4263 series, ISO 4404 series, ISO 20783)

EN ISO 12922:2020 is the authoritative reference for industrial users seeking to specify safe, compliant hydraulic fluids and to understand the testing and compatibility issues associated with fire‑resistant and less flammable hydraulic systems.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2020
Nadomešča:
SIST EN ISO 12922:2013
Maziva, industrijska olja in sorodni proizvodi (skupina L) - Podskupina H
(hidravlični sistemi) - Specifikacije za hidravlične tekočine kategorij HFAE, HFAS,
HFB, HFC, HFDR in HFDU (ISO 12922:2020)
Lubricants, industrial oils and related products (class L) - Family H (Hydraulic systems) -
Specifications for hydraulic fluids in categories HFAE, HFAS, HFB, HFC, HFDR and
HFDU (ISO 12922:2020)
Schmierstoffe, Industrieöle und verwandte Produkte (Klasse L) - Familie H (Hydraulische
Systeme) - Anforderungen an Druckflüssigkeiten in den Kategorien HFAE, HFAS, HFB,
HFC, HFDR und HFDU (ISO 12922:2020)
Lubrifiants, huiles industrielles et produits connexes (classe L) - Famille H (Systèmes
hydrauliques) - Spécifications applicables aux fluides hydrauliques des catégories HFAE,
HFAS, HFB, HFC, HFDR et HFDU (ISO 12922:2020)
Ta slovenski standard je istoveten z: EN ISO 12922:2020
ICS:
75.120 Hidravlični fluidi Hydraulic fluids
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 12922
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 75.120 Supersedes EN ISO 12922:2012
English Version
Lubricants, industrial oils and related products (class L) -
Family H (Hydraulic systems) - Specifications for hydraulic
fluids in categories HFAE, HFAS, HFB, HFC, HFDR and
HFDU (ISO 12922:2020)
Lubrifiants, huiles industrielles et produits connexes Schmierstoffe, Industrieöle und verwandte Produkte
(classe L) - Famille H (Systèmes hydrauliques) - (Klasse L) - Familie H (Hydraulische Systeme) -
Spécifications applicables aux fluides hydrauliques des Anforderungen an Druckflüssigkeiten in den
catégories HFAE, HFAS, HFB, HFC, HFDR et HFDU (ISO Kategorien HFAE, HFAS, HFB, HFC, HFDR und HFDU
12922:2020) (ISO 12922:2020)
This European Standard was approved by CEN on 26 January 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12922:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 12922:2020) has been prepared by Technical Committee ISO/TC 28 "Petroleum
and related products, fuels and lubricants from natural or synthetic sources" in collaboration with
Technical Committee CEN/TC 19 “Gaseous and liquid fuels, lubricants and related products of
petroleum, synthetic and biological origin.” the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2020, and conflicting national standards shall
be withdrawn at the latest by August 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 12922:2012.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 12922:2020 has been approved by CEN as EN ISO 12922:2020 without any modification.

INTERNATIONAL ISO
STANDARD 12922
Third edition
2020-02
Lubricants, industrial oils and
related products (class L) —
Family H (hydraulic systems) —
Specifications for hydraulic fluids
in categories HFAE, HFAS, HFB, HFC,
HFDR and HFDU
Lubrifiants, huiles industrielles et produits connexes (classe L) —
Famille H (systèmes hydrauliques) — Spécifications applicables
aux fluides hydrauliques des catégories HFAE, HFAS, HFB, HFC,
HFDR et HFDU
Reference number
ISO 12922:2020(E)
©
ISO 2020
ISO 12922:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 12922:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 3
4 Sampling . 3
5 Requirements for fire-resistant hydraulic fluids and less flammable hydraulic fluids .3
Bibliography .11
ISO 12922:2020(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 28, Petroleum and related products, fuels
and lubricants from natural or synthetic sources, Subcommittee SC 4, Classifications and specifications.
This third edition cancels and replaces the second edition (ISO 12922:2012), which has been technically
revised. The main changes compared with the previous edition are as follows:
— an introduction and a terms and definitions clause have been added;
— the methods specified for measuring water content in water-based fluid types HFA/HFB/HFC have
been revised;
— the oxidation requirements for HFDU fluids have been increased.
Any feedback or questions on this document should be directed to the user's national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

ISO 12922:2020(E)
Introduction
Hydraulic fluids constitute the largest segment of the industrial lubricant market. Although mineral
oil-based fluids are by far the most widely used type of hydraulic fluid, there are some applications
where the use of these fluids could constitute a fire hazard. In order to reduce the risk to operatives
in such circumstances, fire-resistant or less flammable fluids that increase operator safety have been
developed. However, the following points should be noted.
— Even fire-resistant fluids can ignite at very high temperatures and the flammability behaviour of
the fluids specified in this document covers a very wide range. It is therefore necessary to know the
level of hazard in order to select the appropriate fluid.
— The properties of these fluids can be significantly different to those of conventional mineral oil-based
products. For example, some fire-resistant fluids contain water. It might therefore be necessary to
design the system for their use. It should also not be assumed that synthetic, non-aqueous fluids
can replace mineral oil products without system modifications. Some fluids, for example, are
incompatible with the elastomers used with mineral oils.
To enable the satisfactory operation of fire-resistant hydraulic fluids, it is recommended that this
document is read in conjunction with ISO 7745.
INTERNATIONAL STANDARD ISO 12922:2020(E)
Lubricants, industrial oils and related products (class
L) — Family H (hydraulic systems) — Specifications for
hydraulic fluids in categories HFAE, HFAS, HFB, HFC, HFDR
and HFDU
WARNING — The handling and use of products as specified in this document can be hazardous
if suitable precautions are not observed. This document does not purport to address all of the
safety problems associated with its use. It is the responsibility of the user of this document
to establish appropriate safety and health practices and to determine the applicability of
regulatory limitations prior to use.
1 Scope
This document specifies the minimum requirements of unused fire-resistant and less flammable
hydraulic fluids for hydrostatic and hydrodynamic systems in general industrial applications. It is not
intended for use in aerospace or power-generation applications, where different requirements apply. It
provides guidance for suppliers and end users of these less hazardous fluids and to the manufacturers
of hydraulic equipment in which they are used.
Of the categories covered by ISO 6743-4, which classifies the different types of fluids used in hydraulic
applications, only the following are detailed in this document: HFAE, HFAS, HFB, HFC, HFDR and HFDU.
Types HFAE, HFAS, HFB, HFC and HFDR are "fire-resistant" fluids as defined by ISO 5598. Most HFDU
fluids, while displaying an improvement in combustion behaviour over mineral oil, fall outside this
definition and are more appropriately considered as "less flammable" fluids.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 760, Determination of water — Karl Fischer method (General method)
ISO 2160, Petroleum products — Corrosiveness to copper — Copper strip test
ISO 3104, Petroleum products — Transparent and opaque liquids — Determination of kinematic viscosity
and calculation of dynamic viscosity
ISO 3170, Petroleum liquids — Manual sampling
ISO 3448, Industrial liquid lubricants — ISO viscosity classification
ISO 3675, Crude petroleum and liquid petroleum products — Laboratory determination of density —
Hydrometer method
ISO 4259-2, Petroleum and related products — Precision of measurement methods and results — Part 2:
Interpretation and application of precision data in relation to methods of test
ISO 4263-2, Petroleum and related products — Determination of the ageing behaviour of inhibited oils and
fluids — TOST test — Part 2: Procedure for category HFC hydraulic fluids
ISO 4263-3, Petroleum and related products — Determination of the ageing behaviour of inhibited oils and
fluids using the TOST test — Part 3: Anhydrous procedure for synthetic hydraulic fluids
ISO 12922:2020(E)
ISO 4404-1, Petroleum and related products — Determination of the corrosion resistance of fire-resistant
hydraulic fluids — Part 1: Water-containing fluids
ISO 4404-2, Petroleum and related products — Determination of the corrosion resistance of fire-resistant
hydraulic fluids — Part 2: Non-aqueous fluids
ISO 5598, Fluid power systems and components — Vocabulary
ISO 6072, Rubber — Compatibility between hydraulic fluids and standard elastomeric materials
ISO 6247, Petroleum products — Determination of foaming characteristics of lubricating oils
ISO 6296:2000, Petroleum products — Determination of water — Potentiometric Karl Fischer titration
method
ISO 6618, Petroleum products and lubricants — Determination of acid or base number — Colour-indicator
titration method
ISO 6619, Petroleum products and lubricants — Neutralization number — Potentiometric titration method
ISO 6743-4, Lubricants, industrial oils and related products (class L) — Classification — Part 4: Family H
(Hydraulic systems)
ISO 7120, Petroleum products and lubricants — Petroleum oils and other fluids — Determination of rust-
preventing characteristics in the presence of water
ISO 7745, Hydraulic fluid power — Fire-resistant (FR) fluids — Requirements and guidelines for use
ISO 9120, Petroleum and related products — Determination of air-release properties of steam turbine and
other oils — Impinger method
ISO 12185, Crude petroleum and petroleum products — Determination of density — Oscillating U-tube
method
ISO 14635-1, Gears — FZG test procedures — Part 1: FZG test method A/8,3/90 for relative scuffing load-
carrying capacity of oils
ISO 14935, Petroleum and related products — Determination of wick flame persistence of fire-resistant fluids
ISO 15029-1, Petroleum and related products — Determination of spray ignition characteristics of fire-
resistant fluids — Part 1: Spray flame persistence — Hollow-cone nozzle method
ISO 15029-2, Petroleum and related products — Determination of spray ignition characteristics of fire-
resistant fluids — Part 2: Spray test — Stabilised flame heat release method
ISO 20623, Petroleum and related products — Determination of the extreme-pressure and anti-wear
properties of lubricants — Four-ball method (European conditions)
ISO 20763, Petroleum and related products — Determination of anti-wear properties of hydraulic fluids —
Vane pump method
ISO 20764, Petroleum and related products — Preparation of a test portion of high-boiling liquids for the
determination of water content — Nitrogen purge method
ISO 20783-1, Petroleum and related products — Determination of emulsion stability of fire-resistant
fluids — Part 1: Fluids in category HFAE
ISO 20783-2, Petroleum and related products — Determination of emulsion stability of fire-resistant
fluids — Part 2: Fluids in category HFB
ISO 20823, Petroleum and related products — Determination of the flammability characteristics of fluids
in contact with hot surfaces — Manifold ignition test
2 © ISO 2020 – All rights reserved

ISO 12922:2020(E)
ISO 20843, Petroleum and related products — Determination of pH of fire-resistant fluids within categories
HFAE, HFAS and HFC
ISO 20844, Petroleum and related products — Determination of the shear stability of polymer-containing
oils using a diesel injector nozzle
EN 14832, Petroleum and related products — Determination of the oxidation stability and corrosivity of
fire-resistant phosphate ester fluids
EN 14833, Petroleum and related products — Determination of the hydrolytic stability of fire-resistant
phosphate ester fluids
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Sampling
The sampling of hydraulic fluids for the purposes of this document sha
...