SIST EN ISO 703:2025
(Main)Conveyor belts - Transverse flexibility (troughability) - Test method (ISO 703:2025)
Conveyor belts - Transverse flexibility (troughability) - Test method (ISO 703:2025)
This document specifies a test method for determining the transverse flexibility (troughability) of a conveyor belt, expressed as a ratio, F/L. The method is not suitable or valid for light conveyor belts as described in ISO 21183-1.
NOTE The transverse “flexibility” determined by the method described in this document is only indirectly associated with the inverse of flexural modulus as specified in ISO 178. Nor does it take into consideration the differences in “flexibility” as exhibited by three-point and four-point bending, which takes account of the flexural strain and the thickness of the test piece.
Fördergurte - Biegsamkeit in Querrichtung (Muldungsfähigkeit) - Prüfverfahren (ISO 703:2025)
Dieses Dokument legt ein Prüfverfahren zur Bestimmung der Biegsamkeit in Querrichtung (Muldungsfähigkeit) eines Fördergurts, ausgedrückt als Verhältnis von F/L, fest. Dieses Prüfverfahren ist nicht anwendbar oder gültig für leichte Fördergurte nach ISO 21183 1.
ANMERKUNG Die „Biegsamkeit“ in Querrichtung, die nach dem Verfahren beschrieben in diesem Dokument, bestimmt wird, hängt nur indirekt mit dem Kehrwert des Biegemoduls zusammen, festgelegt in ISO 178. Sie berücksichtigt auch die Unterschiede in der „Biegsamkeit“ nicht, die sich bei einem Biegen an drei Punkten und vier Punkten zeigt, wenn die Biegespannung und die Dicke der Probe berücksichtigt werden.
Courroies transporteuses - Flexibilité transversale (aptitude à la mise en auge) - Méthode d'essai (ISO 703:2025)
Le présent document spécifie une méthode d’essai pour déterminer la flexibilité transversale (aptitude à la mise en auge) d’une courroie transporteuse, exprimée comme le rapport F/L. Cette méthode n’est pas applicable ou valable pour les courroies transporteuses légères décrites dans l’ISO 21183-1.
NOTE La « flexibilité » transversale déterminée par la méthode décrite dans le présent document est uniquement associée indirectement avec le module de flexion inverse spécifié dans l’ISO 178. Elle ne tient pas compte non plus des différences de « flexibilité » démontrées par la flexion en trois et quatre points, laquelle tient compte de l’effort de flexion et de l’épaisseur de l’éprouvette.
Naprave za kontinuirni transport - Trakovi tračnih transporterjev - Prečna upogibnost - Preskusna metoda (ISO 703:2025)
Ta dokument določa preskusno metodo za ugotavljanje prečne upogibnosti trakov tračnih transporterjev, ki je izražena kot razmerje F/L. Ta metoda ni primerna oziroma veljavna za lahke trakove tračnih transporterjev, opisane v standardu ISO 21183-1. OPOMBA: Prečna »upogibnost«, določena z metodo, opisano v tem dokumentu, je le posredno povezana z nasprotno vrednostjo upogibnega modula, določenega v standardu ISO 178. Prav tako ne upošteva razlik v »upogibnosti«, značilne za tri- in štiritočkovno upogibanje, ki upošteva upogibno deformacijo in debelino preskušanca.
General Information
Relations
Overview
EN ISO 703:2025 - Conveyor belts: Transverse flexibility (troughability) - Test method defines a laboratory procedure to quantify the transverse flexibility (troughability) of conveyor belts. The result is reported as a dimensionless ratio F/L (vertical deflection corrected for belt thickness divided by flat width). This European adoption of ISO 703:2025 replaces EN ISO 703:2017 and is intended for standardizing conveyor belt testing across CEN members.
Key topics and technical requirements
- Scope: Measures troughability for conventional conveyor belts; not suitable for light conveyor belts referenced in ISO 21183‑1.
- Test principle: A transverse belt section (length L = full belt width) is suspended by its edges, allowed to sag under its own weight, and the maximum vertical deflection F is measured.
- Test piece dimensions: Longitudinal length = (150 ± 2) mm; thickness d is the overall belt thickness.
- Conditioning: Test pieces must be conditioned per ISO 18573 using atmosphere D or E immediately before testing (conditioning requirements were revised in this edition).
- Apparatus essentials: two rigid horizontal bars, two clamps that do not introduce bending moments, four equal-length suspension wires, and means to measure deflection to the nearest millimetre.
- Measurement and calculation: After 5 minutes in the troughed position, measure the vertical deflection F_measured and compute F = F_measured + 0.5·d. Report results as F/L.
- Reporting: Test report must identify belt, manufacturing date, reference to ISO 703:2025, L, d, conditioning atmosphere (D or E) and the F/L result.
- Limitations: The measured “flexibility” is only indirectly related to flexural modulus (ISO 178) and does not distinguish between three‑ and four‑point bending behaviours.
Applications and users
- Who uses it: conveyor belt manufacturers, independent testing laboratories, OEMs, conveyor designers, maintenance and reliability engineers, procurement and quality assurance teams, and certification bodies.
- Practical value:
- Select belts compatible with troughing idler geometry and reduce lateral travel/track problems.
- Establish acceptance, quality-control and comparative data for belt batches.
- Inform conveyor design decisions where trough shape stability and empty-belt tracking are critical.
- Keywords: EN ISO 703:2025, conveyor belts, troughability, transverse flexibility, test method, F/L ratio, belt conditioning, conveyor belt testing.
Related standards
- ISO 18573 - Test atmospheres and conditioning periods
- ISO 583 / ISO 7590 - Methods for thickness measurement (textile/steel-cord belts)
- ISO 178 - Flexural modulus (related but not equivalent)
- ISO 21183‑1 - Light conveyor belts (method not applicable)
This standard gives objective, repeatable data for troughability, helping ensure belt performance and compatibility with conveyor systems.
Frequently Asked Questions
SIST EN ISO 703:2025 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Conveyor belts - Transverse flexibility (troughability) - Test method (ISO 703:2025)". This standard covers: This document specifies a test method for determining the transverse flexibility (troughability) of a conveyor belt, expressed as a ratio, F/L. The method is not suitable or valid for light conveyor belts as described in ISO 21183-1. NOTE The transverse “flexibility” determined by the method described in this document is only indirectly associated with the inverse of flexural modulus as specified in ISO 178. Nor does it take into consideration the differences in “flexibility” as exhibited by three-point and four-point bending, which takes account of the flexural strain and the thickness of the test piece.
This document specifies a test method for determining the transverse flexibility (troughability) of a conveyor belt, expressed as a ratio, F/L. The method is not suitable or valid for light conveyor belts as described in ISO 21183-1. NOTE The transverse “flexibility” determined by the method described in this document is only indirectly associated with the inverse of flexural modulus as specified in ISO 178. Nor does it take into consideration the differences in “flexibility” as exhibited by three-point and four-point bending, which takes account of the flexural strain and the thickness of the test piece.
SIST EN ISO 703:2025 is classified under the following ICS (International Classification for Standards) categories: 53.040.20 - Components for conveyors. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN ISO 703:2025 has the following relationships with other standards: It is inter standard links to SIST EN ISO 703:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase SIST EN ISO 703:2025 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2025
Naprave za kontinuirni transport - Trakovi tračnih transporterjev - Prečna
upogibnost - Preskusna metoda (ISO 703:2025)
Conveyor belts - Transverse flexibility (troughability) - Test method (ISO 703:2025)
Fördergurte - Biegsamkeit in Querrichtung (Muldungsfähigkeit) - Prüfverfahren (ISO
703:2025)
Courroies transporteuses - Flexibilité transversale (aptitude à la mise en auge) -
Méthode d'essai (ISO 703:2025)
Ta slovenski standard je istoveten z: EN ISO 703:2025
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 703
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2025
EUROPÄISCHE NORM
ICS 53.040.20 Supersedes EN ISO 703:2017
English Version
Conveyor belts - Transverse flexibility (troughability) -
Test method (ISO 703:2025)
Courroies transporteuses - Flexibilité transversale Fördergurte - Biegsamkeit in Querrichtung
(aptitude à la mise en auge) - Méthode d'essai (ISO (Muldungsfähigkeit) - Prüfverfahren (ISO 703:2025)
703:2025)
This European Standard was approved by CEN on 13 March 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 703:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 703:2025) 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 February 2026, and conflicting national standards
shall be withdrawn at the latest by February 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 703:2017.
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 703:2025 has been approved by CEN as EN ISO 703:2025 without any modification.
International
Standard
ISO 703
Fifth edition
Conveyor belts — Transverse
2025-07
flexibility (troughability) —
Test method
Courroies transporteuses — Flexibilité transversale (aptitude à la
mise en auge) — Méthode d'essai
Reference number
ISO 703:2025(en) © ISO 2025
ISO 703:2025(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.
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 703:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 1
5 Principle . 1
6 Apparatus . 2
7 Test piece . 3
7.1 Dimensions .3
7.2 Conditioning.3
8 Procedure . 4
9 Calculation and expression of results . 4
10 Test report . 4
Bibliography . 6
iii
ISO 703:2025(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
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 I
...
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