IEC 60404-1:2016/AMD1:2025

Amendment 1 - Magnetic materials - Part 1: Classification

Amendement 1 - Matériaux magnétiques - Partie 1: Classification

General Information

• Status: Published
• Publication Date: 24-Jul-2025
• ICS: 29.030 - Magnetic materials
• Technical Committee: TC 68 - Magnetic alloys and steels
• Drafting Committee: WG 5 - TC 68/WG 5
• Current Stage: PPUB - Publication issued
• Start Date: 25-Jul-2025
• Completion Date: 25-Aug-2025

Relations

• Amends: IEC 60404-1:2016 - Magnetic materials - Part 1: Classification
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60404-1 ®
Edition 3.0 2025-07
INTERNATIONAL
STANDARD
AMENDMENT 1
Magnetic materials -
Part 1: Classification
ICS 29.030  ISBN 978-2-8327-0590-2

IEC 60404-1:2016-10/AMD1:2025-07(en)

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either
IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright
or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local
IEC member National Committee for further information.

IEC Secretariat Tel.: [phone]
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

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replaced and withdrawn publications.
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The world's leading online dictionary on electrotechnology,
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Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English
details all new publications released. Available online and and French, with equivalent terms in 25 additional languages.
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(IEV) online.
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need further assistance, please contact the Customer
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Magnetic materials -
Part 1: Classification
AMENDMENT 1
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 60404-1:2016 has been prepared by IEC technical committee 68:
Magnetic alloys and steels.
The text of this Amendment is based on the following documents:
Draft Report on voting
68/780/CDV 68/791A/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and I
...

IEC 60404-1 ®
Edition 3.0 2025-07
NORME
INTERNATIONALE
AMENDEMENT 1
Matériaux magnétiques -
Partie 1: Classification
ICS 29.030  ISBN 978-2-8327-0590-2

IEC 60404-1:2016-10/AMD1:2025-07(fr)

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

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Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

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COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
Matériaux magnétiques -
Partie 1: Classification
AMENDEMENT 1
AVANT-PROPOS
1) La Commission Électrotechnique Internationale (IEC) est une organisation mondiale de normalisation composée
de l'ensemble des comités électrotechniques nationaux (Comités nationaux de l'IEC). L'IEC a pour objet de
favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines de
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conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de l'IEC concernant les questions techniques représentent, dans la mesure du
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mesure possible, à appliquer de façon transparente les Publications de l'IEC dans leurs publications nationales
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référencées est obligatoire pour une application correcte de la présente publication.
9) L'IEC attire l'attention sur le fait que la mise en application du présent document peut entraîner l'utilisation d'un
ou de plusieurs brevets. L'IEC ne prend pas position quant à la preuve, à la validité et à l'applicabilité de tout
droit de brevet revendiqué à cet égard. À la date de publication du présent document, l'IEC n'a pas reçu
notification qu'un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois, il y a lieu
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L'IEC ne saurait être tenue pour responsable de ne pas avoir identifié de tels droits de brevet.
L'amendement 1 de l'IEC 60404-1:2016 a été établi par le comité d'études 68 de l'IEC:
Matériaux magnétiques tels qu'alliages et aciers.
Le texte de cet Amendement est issu des documents suivants:
Projet Rapport de vote
68/780/CDV 68/791A/RVC
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à son approbation.
La langue employée pour l'élaboration de cet Amendement est l'anglais.
Ce document a été rédigé selon les Directives ISO/IEC, Partie 2, il a été développé selon les
Directives ISO/IEC, Partie 1 et les Directives ISO/IEC, Supplément IEC, disponibles sous
...

IEC 60404-1 ®
Edition 3.0 2025-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Magnetic materials -
Part 1: Classification
Matériaux magnétiques -
Partie 1: Classification
ICS 29.030  ISBN 978-2-8327-0590-2

IEC 60404-1:2016-10/AMD1:2025-07(en-fr)

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either
IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright
or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local
IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Secretariat Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Discover our powerful search engine and read freely all the
The advanced search enables to find IEC publications by a publications previews, graphical symbols and the glossary.
variety of criteria (reference number, text, technical With a subscription you will always have access to up to date
committee, …). It also gives information on projects, content tailored to your needs.

replaced and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English
details all new publications released. Available online and and French, with equivalent terms in 25 additional languages.
once a month by email. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer
Service Centre: [e-mail].
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC -  IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez
La recherche avancée permet de trouver des publications gratuitement tous les aperçus des publications, symboles
IEC en utilisant différents critères (numéro de référence, graphiques et le glossaire. Avec un abonnement, vous aurez
texte, comité d’études, …). Elle donne aussi des toujours accès à un contenu à jour adapté à vos besoins.
informations sur les projets et les publications remplacées
ou retirées. Electropedia - www.electropedia.org
Le premier dictionnaire d'électrotechnologie en ligne au
IEC Just Published - webstore.iec.ch/justpublished monde, avec plus de 22 500 articles terminologiques en
Restez informé sur les nouvelles publications IEC. Just anglais et en français, ainsi que les termes équivalents
Published détaille les nouvelles publications parues. dans 25 langues additionnelles. Egalement appelé
Disponible en ligne et une fois par mois par email. Vocabulaire Electrotechnique International (IEV) en ligne.

Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-
nous: [e-mail].
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Magnetic materials -
Part 1: Classification
AMENDMENT 1
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 60404-1:2016 has been prepared by IEC technical committee 68:
Magnetic alloys and steels.
The text of this Amendment is based on the following documents:
Draft Report on voting
68/780/CDV 68/791A/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications/.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
___________
2 Normative references
Add the following new reference to the existing list:
IEC 60404-8-11, Magnetic materials - Part 8-11: Specifications for individual materials - Fe-
based amorphous strip delivered in the semi-processed state
4.3.2.2.3 Basis of subclassification
Add, at the end of the subclause, the following new text:
With the revision of IEC 60404-8-7 in 2020, an additional subclassification has been introduced
in order to distinguish between high-permeability grades with and without magnetic domain
refinement.
4.3.2.2.5 Physical characteristics
Add, after the existing first bulleted item of the list, the following new list item:
• Domain Refined (DR) state: whether or not the material has been treated with a technology
for magnetic domain refinement;
Add, before the existing final paragraph, the following new note:
NOTE According to IEC 60404-8-7, the magnetic properties of non-heatproof magnetic domain refined
high-permeability grades are determined according to IEC 60404-3 without applying a supplementary heat treatment,
and in the case of heatproof magnetic domain refinement grades, these properties are determined in accordance
with IEC 60404-2 after the required heat treatment.
4.9.2 Class I1 - Iron-based amorphous alloys
4.9.2.1 Reference document
Replace the existing text with the following:
These materials are covered by IEC 60404-8-11.
5.2.5 Class R7 - Rare earth-iron-boron (REFeB) alloys
Replace the existing titles and text of subclauses 5.2.5 and 5.2.5.1 with the following new titles:
5.2.5 Class R7 - Rare earth-iron-boron (REFeB) sintered magnets
5.2.5.1 Void
5.2.5.2 Chemical composition and manufacturing method
Replace the existing first paragraph including the two bullet points with the following:
The sintered magnets are based on the compound RE Fe B. RE is mainly neodymium, which
2 14
may be partially substituted by dysprosium, praseodymium or other rare earths. Iron may be
partially substituted by cobalt. The alloys consist of 28 % to 35 % total rare earth, 0 % to 15 %
cobalt, 0,85 % to 1,2 % boron, 0 % to 11 % dysprosium and terbium, 0 % to 15 % praseodymium,
cerium (Ce), etc., 0 % to 1 % vanadium, niobium, aluminium, gallium and copper and the
balance iron.
The sintered magnets are prepared by compacting milled alloy powder in a magnetic field and
sintering the compacted body for densification followed by a heat treatment, resulting in a
magnet with anisotropic magnetic properties.
Add, after the existing 5.2.5.6, the following new subclause:
5.2.6 Class R8 - Rare earth-iron-boron (REFeB) hot deformed magnets
5.2.6.1 Reference document
These materials are covered by IEC 60404-8-1.
5.2.6.2 Chemical composition and manufacturing method
The hot deformed magnets are based on the compound RE Fe B. The composition of the
2 14
magnets are the same as the REFeB sintered magnets (Class R7).
The hot deformed magnets use rapidly solidified flakes prepared by the melt-spinning process.
After obtaining isotropic pressed bodies, the pressed bodies are consolidated and subsequently
hot deformed at elevated temperatures. Alignment of grains is obtained along compression
stress during die-upsetting or extrusion.
5.2.6.3 Basis of subclassification
The recommended subclassification is based on the degree of magnetic anisotropy and
chemical compositions of the material.
5.2.6.4 Available forms
The materials are typically available in the form of rings and plates.
5.2.6.5 Physical characteristics
The physical characteristics of REFeB hot deformed magnets are the same as REFeB sintered
magnets (Class R7).
5.2.6.6 Main applications
The main applications of REFeB hot deformed magnets are the same as REFeB sintered
magnets (Class R7).
5.3.2 Chemical composition and manufacturing method
Replace the existing first paragraph with the following new paragraph:
The composition of the hard ferrites can be described by the formula MO·n Fe 0 (where M is
2 3
barium, strontium and calcium). The value of n can vary from 4,5 to 6,5. The magnetic properties
may be improved by special substitutions. This is particularly so with substitutions of lanthanum
for strontium or calcium and of cobalt for iron. The hard ferrites have a hexagonal crystal
structure with magnetic anisotropy.
5.5.4.2 Chemical composition and manufacturing method
Replace the existing paragraph with the following new paragraph:
These bonded magnets contain powdered alloys as given in class R7. There are 2 k
...