EN ISO 1421:2016

SLOVENSKI STANDARD
01-marec-2017
1DGRPHãþD
SIST EN ISO 1421:1999
Gumirane ali plastificirane tekstilije - Ugotavljanje natezne trdnosti in pretržnega
raztezka (ISO 1421:2016)
Rubber- or plastics-coated fabrics - Determination of tensile strength and elongation at
break (ISO 1421:2016)
Mit Kautschuk oder Kunststoff beschichtete Textilien - Bestimmung der Zugfestigkeit und
der Bruchdehnung (ISO 1421:2016)
Supports textiles revêtus de caoutchouc ou de plastique - Détermination de la force de
rupture et de l’allongement à la rupture (ISO 1421:2016)
Ta slovenski standard je istoveten z: EN ISO 1421:2016
ICS:
59.080.40 3RYUãLQVNRSUHYOHþHQH Coated fabrics
WHNVWLOLMH
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 1421
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2016
EUROPÄISCHE NORM
ICS 59.080.40 Supersedes EN ISO 1421:1998
English Version
Rubber- or plastics-coated fabrics - Determination of
tensile strength and elongation at break (ISO 1421:2016)
Supports textiles revêtus de caoutchouc ou de Mit Kautschuk oder Kunststoff beschichtete Textilien -
plastique - Détermination de la force de rupture et de Bestimmung der Zugfestigkeit und der Bruchdehnung
l'allongement à la rupture (ISO 1421:2016) (ISO 1421:2016)
This European Standard was approved by CEN on 17 September 2016.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 1421:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
European foreword
This document (EN ISO 1421:2016) has been prepared by Technical Committee ISO/TC 45 "Rubber and
rubber products" in collaboration with Technical Committee CEN/TC 248 “Textiles and textile
products” the secretariat of which is held by BSI.
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 June 2017, and conflicting national standards shall be
withdrawn at the latest by June 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN ISO 1421:1998.
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, Former Yugoslav Republic of Macedonia, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 1421:2016 has been approved by CEN as EN ISO 1421:2016 without any modification.
INTERNATIONAL ISO
STANDARD 1421
Third edition
2016-12-01
Rubber- or plastics-coated fabrics —
Determination of tensile strength and
elongation at break
Supports textiles revêtus de caoutchouc ou de plastique —
Détermination de la force de rupture et de l’allongement à la rupture
Reference number
ISO 1421:2016(E)
©
ISO 2016
ISO 1421:2016(E)
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved

ISO 1421:2016(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 5
5 Apparatus and reagents . 5
6 Atmosphere for conditioning and testing . 6
6.1 For conditioning . 6
6.2 For testing . 6
7 Time-interval between manufacture and testing. 6
8 Method 1: Strip test method . 6
8.1 Sampling and preparation of test pieces . 6
8.2 Procedure . 7
8.2.1 Mounting the test piece in place . 7
8.2.2 Operation . 9
8.2.3 Slippage . . 9
8.2.4 Jaw breaks and the breaks outside the reference marks . 9
8.2.5 Test on wet test pieces . 9
8.3 Calculation and expression of results.10
8.4 Test report .10
9 Method 2: Grab test method .10
9.1 Sampling and preparation of test pieces .10
9.2 Procedure .11
9.2.1 Mounting the test piece in place .11
9.2.2 Operation .11
9.2.3 Slippage . .11
9.2.4 Jaw breaks.11
9.2.5 Test on wet test pieces .11
9.3 Calculation and expression of results.13
9.4 Test report .13
ISO 1421:2016(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 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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on 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 the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee
SC 4, Products (other than hoses).
This third edition cancels and replaces the second edition (ISO 1421:1998), which has been technically
revised. The changes are as follows.
— In Clause 3, gauge length and reference points have been added and Figures 1, 2, and 3 have been
moved to clarify the definitions.
— The title of Clause 5 has been changed.
— Clause 6 has been subdivided in two subclauses and conditions have been clarified respectively by
referring to the particulars specified in ISO 2231:1989.
— A new clause has been added to specify the time-interval between manufacture and testing.
— In 8.1, two narrower widths of 10 mm and 30 mm have been added for test piece and the pre-tension
forces have been revised accordingly. The procedure for the test pieces with reference mark has
been incorporated.
— In 8.2, the procedure for handling abnormal test results has been modified.
iv © ISO 2016 – All rights reserved

INTERNATIONAL STANDARD ISO 1421:2016(E)
Rubber- or plastics-coated fabrics — Determination of
tensile strength and elongation at break
WARNING — Persons using this International Standard should be familiar with normal
laboratory practice. This International Standard does not purport to address all of the
safety problems, if any, associated with its use. It is the responsibility of the user to establish
appropriate safety and health practices and to ensure compliance with any national regulatory
conditions.
1 Scope
This International Standard specifies two methods for the determination of the tensile strength of
fabrics coated with rubber or plastics.
— Method 1 — the strip test method, which is a method for the determination of tensile strength and
elongation at break.
— Method 2 — the grab test method, which is a method for the determination of tensile strength only.
The methods apply to test pieces in equilibrium with specific standard atmospheres for testing and
to wet test pieces. Both methods require the use of a constant rate of extension (CRE) tensile-testing
machine.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 2231:1989, Rubber- or plastics-coated fabrics — Standard atmospheres for conditioning and testing
ISO 2286-2, Rubber- or plastics-coated fabrics — Determination of roll characteristics — Part 2: Methods
for determination of total mass per unit area, mass per unit area of coating and mass per unit area of
substrate
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
constant rate of extension
CRE
means of conducting a tensile test in which the rate of increase in the length of the test piece is uniform
with time
Note 1 to entry: The rate of increase of the force is dependent upon the extension characteristics of the test piece.
ISO 1421:2016(E)
3.2
elongation
extension
E
increase in length of a test piece
Note 1 to entry: It is expressed in units of length, e.g. cm or mm.
3.3
elongation at break
elongation (3.2) of a test piece corresponding to the force at the breaking point
Note 1 to entry: See Figure 1. It is usually expressed as a percentage of the nominal gauge length (3.9).
Y
Key
X elongation, E
Y force
1 maximum force
2 force at break
3 elongation at maximum force
4 elongation at break
Figure 1 — Tensile force at break
3.4
elongation at maximum force
elongation (3.2) of a test piece produced by the maximum force
Note 1 to entry: See Figure 1, Figure 2 and Figure 3.
2 © ISO 2016 – All rights reserved

ISO 1421:2016(E)
Y
Key
X elongation, E
Y force
1 maximum force
2 elongation at maximum force
Figure 2 — Maximum force at break
3.5
force at break
tensile force recorded at the moment of break
Note 1 to entry: See Figure 1.
Note 2 to entry: Figure 3 corresponds to the rupture of one of the elements constituting the coated fabric. Typical
examples are:
a) a “rigid” polymer layer on an extensible fabric: rupture of the polymer layer;
b) a very extensible, thick polymer layer on a weak, less extensible fabric or nonwoven: rupture of the woven
fabric or of the nonwoven.
ISO 1421:2016(E)
Y
Key
X elongation, E
Y force
1 maximum force
2 elongation at maximum force
3 rupture of
...