ISO 20347:2021/Amd 1:2024

International
Standard
ISO 20347
Third edition
Personal protective equipment —
2021-12
Occupational footwear
AMENDMENT 1
AMENDMENT 1
2024-01
Équipement de protection individuelle — Chaussures de travail
AMENDEMENT 1
Reference number
ISO 20347:2021/Amd.1:2024(en) © ISO 2024

ISO 20347:2021/Amd.1:2024(en)
© ISO 2024
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 20347:2021/Amd.1:2024(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO 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, ISO 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
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 94, Personal Safety — Personal protective
equipment, Subcommittee SC 3, Foot protection, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 161, Foot and leg protectors, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
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.

iii
ISO 20347:2021/Amd.1:2024(en)
Personal protective equipment — Occupational footwear
AMENDMENT 1
Clause 2 Normative references
Update the reference to “ISO 20344:2021” with “ISO 20344:2021+Amd.1:2024” and update the references
throughout the document accordingly.

Change the title of EN 13832-3:2018 to read as follows:
“Footwear protecting against chemicals — Part 3: Requirements for prolonged contact with chemicals”

5.1, Table 2
In the section “Upper”, add an “X” in the last two cells of the row “Tear strength” to read as follows:
Tear strength 5.4.3 X X X
In the section “Upper”, add an “X” in the last two cells of the row “Water vapour permeability and coefficient”,
to read as follows:
Water vapour permeability 5.4.6 X X X
and coefficient
5.3.2
Replace the subclause with the following:
“When tested in accordance with ISO 20344:2021+Amd.1:2024, 5.7 there shall be no leakage of air. For
design A of class II footwear, this requirement is not applicable.”

rd
5.3.5, 3 paragraph
Replace the paragraph with the following:
“For each leather part tested in accordance with ISO 20344:2021+Amd.1:2024, 6.11, the chromium VI
content shall be less than 3,0 mg/kg.”

nd
5.4.1.1, 2 sentence
Add the wording “, except for water vapour permeability and water vapour coefficient (see 5.4.6).” to the end
of the sentence, to read as follows:

ISO 20347:2021/Amd.1:2024(en)
“Any materials in the upper below the height defined in Table 8 shall meet the requirements of the upper
(see Table 2), except for water vapour permeability (WVP) and water vapour coefficient (WVC) (see
5.4.6).”
5.4.1.2
Replace the text above Figure 6 with the following:
“Hybrid footwear (3.18) consists of two classes of materials: foot section, Area A, class II material and
extended section, area B, class I material.
The Area A, shall be measured as H, between the lowest point of the top of the visible polymer (or rubber)
part and the ground (see Figure 6) and shall have a minimum height corresponding to the values given
in Table 6 for design B. All material extensions above belong to area B.
All materials shall meet the requirements of the upper depending on the class of material (see Table 2).”

5.4.6
Replace the subclause with the following:
“Footwear shall comply with one of the following criteria’s:
a.  If the upper contains an area of maximum 10 % of non-water vapour permeable material, measured
according to ISO 20344:2021+Amd.1:2024, 6.2.3, all remaining materials shall fulfil a water vapour
2 2
permeability of at least 0,8 mg/(cm ·h) and the water vapour coefficient shall be at least 15 mg/cm
when tested in accordance with ISO 20344:2021+Amd.1:2024, 6.6, 6.7 and 6.8
b.  If the upper contains an area of maximum 50 % of non-water vapour permeable material, measured
according to ISO 20344:2021+Amd.1:2024, 6.2.3, all remaining materials shall fulfil a water vapour
permeability of at least 2,0 mg/(cm ·h)”

5.5.4, Title
Add the abbreviations “WVP” and “WVC” to the title of the subclause, to read as
...