EN ISO 21181:2025

SLOVENSKI STANDARD
01-februar-2026
Naprave za kontinuirni transport - Lahki trakovi tračnih transporterjev -
Ugotavljanje sproščenega elastičnega modula (ISO 21181:2025)
Light conveyor belts - Determination of the relaxed elastic modulus (ISO 21181:2025)
Leichte Fördergurte - Bestimmung des relaxierten Elastizitätsmoduls (ISO 21181:2025)
Courroies transporteuses légères - Détermination du module d'élasticité relaxé (ISO
21181:2025)
Ta slovenski standard je istoveten z: EN ISO 21181:2025
ICS:
53.040.10 Transporterji Conveyors
53.040.20 Deli za transporterje Components for conveyors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 21181
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2025
EUROPÄISCHE NORM
ICS 53.040.20 Supersedes EN ISO 21181:2013
English Version
Light conveyor belts - Determination of the relaxed elastic
modulus (ISO 21181:2025)
Courroies transporteuses légères - Détermination du Leichte Fördergurte - Bestimmung des relaxierten
module d'élasticité relaxé (ISO 21181:2025) Elastizitätsmoduls (ISO 21181:2025)
This European Standard was approved by CEN on 4 November 2025.

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, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21181:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 21181:2025) has been prepared by Technical Committee ISO/TC 41 “Pulleys
and belts (including veebelts)” in collaboration with Technical Committee CEN/TC 188 “Conveyor belts”
the secretariat of which is held by SNV.
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 May 2026, and conflicting national standards shall be
withdrawn at the latest by May 2026.
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 21181:2013.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 21181:2025 has been approved by CEN as EN ISO 21181:2025 without any modification.

International
Standard
ISO 21181
Third edition
Light conveyor belts —
2025-11
Determination of the relaxed
elastic modulus
Courroies transporteuses légères — Détermination du module
d'élasticité relaxé
Reference number
ISO 21181:2025(en) © ISO 2025
ISO 21181:2025(en)
© ISO 2025
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.
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 21181:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Principle . 2
6 Apparatus . 2
7 Test pieces . 2
7.1 Shape, dimensions, number and selection .2
7.2 Conditioning.3
8 Test method . 3
8.1 Test room condition .3
8.2 Procedure .3
9 Calculation and expression of results . 4
10 Test report . 6
Bibliography . 7

iii
ISO 21181:2025(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
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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)
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This document was prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts),
Subcommittee SC 3, Conveyor belts, in collaboration with the European Committee for Standardization
...