EN ISO 252:2023

• Abstract:

  This document specifies two test methods, A and B, for determining the adhesion strength between constitutive elements of a conveyor belt, i.e. between plies and between covers and carcass. Basic test conditions are in conformity with ISO 36.; It is applicable to all types of construction of conveyor belting with the exception of belts containing steel cord reinforcement, and textile-reinforced belts with a full-thickness tensile strength of less than 160 N/mm. It is not suitable or valid for light conveyor belts as described in ISO 21183-1[1].; NOTE Methods A and B are alternative options, but the mean adhesive force values calculated for the two methods can be different. Also, as both methods might not be equally suitable for all belt constructions, it is advisable that the advice of the belt manufacturer be sought.

• Status: Published
• Publication Date: 21-Mar-2023
• ICS: 53.040.20 - Components for conveyors
• Technical Committee: CEN/TC 188 - Conveyor belts
• Drafting Committee: CEN/TC 188 - Conveyor belts
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 22-Mar-2023
• Completion Date: 22-Mar-2023
• Ref Project: SIST EN ISO 252:2023 - Conveyor belts - Adhesion between constitutive elements - Test methods (ISO 252:2023)

• Replaces: EN ISO 252:2007 - Conveyor belts - Adhesion between constitutive elements - Test methods (ISO 252:2007)
• Effective Date: 19-Jan-2023
• Refers: ISO 18573:2012 - Conveyor belts — Test atmospheres and conditioning periods
• Effective Date: 25-Aug-2026
• Refers: ISO 36:2020 - Rubber, vulcanized or thermoplastic — Determination of adhesion to textile fabrics
• Effective Date: 25-Aug-2026
• Refers: ISO 6133:2015 - Rubber and plastics — Analysis of multi-peak traces obtained in determinations of tear strength and adhesion strength
• Effective Date: 09-Feb-2026
• Refers: EN 17917:2023 - Paper and board - Paper and board intended to come into contact with foodstuffs - Determination of aluminium in aqueous extracts
• Effective Date: 28-Jan-2026
• Referred By: EN ISO 14890:2003 - Conveyor belts - Specification for rubber or plastics covered conveyor belts of textile construction for general use (ISO 14890:2003)
• Effective Date: 28-Jan-2026
• Consolidated By: ISO 252:2023 - Conveyor belts — Adhesion between constitutive elements — Test methods
• Effective Date: 12-Feb-2026

Overview

EN ISO 252:2023 (ISO 252:2023) specifies laboratory test methods for adhesion between constitutive elements of conveyor belts - i.e., adhesion between plies and between covers and the carcass. Published by CEN/ISO, it defines two alternative procedures (Method A and Method B), key test-piece geometry, conditioning, apparatus and how to express results. Basic test conditions align with ISO 36. The standard replaces EN ISO 252:2007.

Key topics and technical requirements

• Scope & exclusions: Applicable to most conveyor belting constructions except belts with steel cord reinforcement and textile‑reinforced belts with full‑thickness tensile strength < 160 N/mm. Not suitable for light conveyor belts (see ISO 21183‑1).
• Test methods: Two alternative procedures - Method A and Method B. Both use a constant‑rate tensile (strip) test; mean adhesive force values from the two methods can differ, so manufacturer guidance is advised.
• Apparatus: Power‑driven tensile testing machine conforming to ISO 36.
• Test pieces:
  • Rectangular strips: (25 ± 0.5) mm wide, minimum 200 mm length (min. 100 mm strip length to be stripped).
  • Take samples at least 100 mm from belt edges; use two longitudinal pieces (two transverse pieces optional if agreed).
• Conditioning and timing:
  • Condition test pieces per ISO 18573 (atmosphere D or E).
  • Minimum time between manufacture and test: 16 hours (including conditioning).
• Test procedure details:
  • Rate of traverse for the driven jaw: (100 ± 10) mm/min.
  • Record autographic force trace long enough to obtain eight or more peak force points.
• Expression of results:
  • Analyze multi‑peak traces per ISO 6133.
  • The median peak is specified as the mean adhesion force; the lowest recorded peak is the minimum adhesion force.
  • Report adhesion as N/mm (to the nearest 0.1 N/mm).

Applications and who uses it

• Quality control and acceptance testing for conveyor belting manufacturers and independent test laboratories.
• Procurement and specification teams in mining, aggregate, bulk material handling, ports and manufacturing to verify belt layer adhesion.
• R&D and product development for new belt constructions and compound formulations.
• Maintenance and safety engineers assessing potential delamination risks and service life.
• Certification bodies and standards committees referencing bond strength criteria.

Related standards

• ISO 36 - Rubber: determination of adhesion to textile fabrics (apparatus requirements)
• ISO 6133 - Analysis of multi‑peak traces (tear/adhesion)
• ISO 18573 - Conveyor belts: test atmospheres and conditioning
• ISO 21183‑1 - Light conveyor belts (not covered by ISO 252)

EN ISO 252:2023 is essential for consistent, reproducible measurement of interlayer adhesion in conveyor belts and supports reliable product specification, acceptance testing and safety assessments.

SLOVENSKI STANDARD
01-september-2023
Naprave za kontinuirni transport - Trakovi tračnih transporterjev - Sprijetost
osnovnih sestavnih elementov - Preskusne metode (ISO 252:2023)
Conveyor belts — Adhesion between constitutive elements — Test methods (ISO
252:2023)
Fördergurte – Lagenhaftung zwischen den Bestandteilen – Prüfverfahren (ISO 252:2023)
Courroies transporteuses Adhérence entre éléments constitutifs - Méthodes d'essai
(ISO 252:2023)
Ta slovenski standard je istoveten z: EN ISO 252:2023
ICS:
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 252
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2023
EUROPÄISCHE NORM
ICS 53.040.20 Supersedes EN ISO 252:2007
English Version
Conveyor belts - Adhesion between constitutive elements -
Test methods (ISO 252:2023)
Courroies transporteuses - Adhérence entre éléments Fördergurte - Lagenhaftung zwischen den
constitutifs - Méthodes d'essai (ISO 252:2023) Bestandteilen - Prüfverfahren (ISO 252:2023)
This European Standard was approved by CEN on 2 March 2023.

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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 252:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 252:2023) 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 September 2023, and conflicting national standards
shall be withdrawn at the latest by September 2023.
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 252:2007.
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 252:2023 has been approved by CEN as EN ISO 252:2023 without any modification.

INTERNATIONAL ISO
STANDARD 252
Fourth edition
2023-03
Conveyor belts — Adhesion between
constitutive elements — Test methods
Courroies transporteuses — Adhérence entre éléments constitutifs —
Méthodes d'essai
Reference number
ISO 252:2023(E)
ISO 252:2023(E)
© ISO 2023
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]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 252:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Test pieces .2
6.1 Time between manufacture and test . 2
6.2 Shape and dimensions . 2
6.3 Number . 2
6.4 Selection of test pieces from sample . 2
6.5 Conditioning. 2
7 Procedure .2
8 Expression of results . 5
8.1 Examination of traces for longitudinal test pieces . . 5
8.2 Examination of traces for transverse test pieces . 5
9 Test report . 5
Bibliography . 6
iii
ISO 252:2023(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
...