SIST EN ISO 20932-1:2020

SLOVENSKI STANDARD
01-maj-2020
Nadomešča:
SIST EN 14704-1:2005
Tekstilije - Ugotavljanje elastičnosti tkanin - 1. del: Preskusi traku (ISO 20932-
1:2018)
Textiles - Determination of the elasticity of fabrics - Part 1: Strip tests (ISO 20932-
1:2018)
Textilien - Bestimmung der Elastizität von textilen Flächengebilden - Teil 1:
Streifenprüfungen (ISO 20932-1:2018)
Textiles - Détermination de l'élasticité des étoffes - Partie 1: Essais sur bande (ISO
20932-1:2018)
Ta slovenski standard je istoveten z: EN ISO 20932-1:2020
ICS:
59.080.01 Tekstilije na splošno Textiles in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 20932-1
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 59.080.30 Supersedes EN 14704-1:2005
English Version
Textiles - Determination of the elasticity of fabrics - Part 1:
Strip tests (ISO 20932-1:2018)
Textiles - Détermination de l'élasticité des étoffes - Textilien - Bestimmung der Elastizität von textilen
Partie 1: Essais sur bande (ISO 20932-1:2018) Flächengebilden - Teil 1: Streifenprüfungen (ISO
20932-1:2018)
This European Standard was approved by CEN on 11 November 2019.

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, Turkey 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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20932-1:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 20932-1:2018 has been prepared by Technical Committee ISO/TC 38 "Textiles” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 20932-1:2020
by 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 August 2020, and conflicting national standards shall
be withdrawn at the latest by August 2020.
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 14704-1:2005.
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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 20932-1:2018 has been approved by CEN as EN ISO 20932-1:2020 without any
modification.
INTERNATIONAL ISO
STANDARD 20932-1
First edition
2018-11
Textiles — Determination of the
elasticity of fabrics —
Part 1:
Strip tests
Textiles — Détermination de l'élasticité des étoffes —
Partie 1: Essais sur bande
Reference number
ISO 20932-1:2018(E)
©
ISO 2018
ISO 20932-1:2018(E)
© ISO 2018
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
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below or ISO’s member body in the country of the requester.
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Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

ISO 20932-1:2018(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Sampling . 3
6 Apparatus . 4
7 Atmosphere for conditioning and testing . 5
8 Preparation of test specimens . 5
8.1 General . 5
8.2 Test specimen preparation . 5
8.2.1 Woven fabrics . 5
8.2.2 Knitted fabrics . 6
8.2.3 Nonwoven fabrics . 7
9 Procedure. 8
9.1 Woven and nonwoven fabrics (other than knitted) . 8
9.1.1 Method A — Strip test specimens . 8
9.1.2 Method B — Loop test specimens . 8
9.2 Knitted fabrics . 8
9.2.1 Method A — Strip test specimens . 8
9.2.2 Method B — Loop test specimens . 9
9.3 Operation . 9
10 Recording .10
11 Expressions and calculations of test results .10
12 Test report .11
Annex A (informative) Example of a typical cycling graph .13
Annex B (informative) Procedure for sampling .14
Annex C (informative) Clamping and holding devices .15
Annex D (informative) Example of a pattern for cutting test specimens from a laboratory
sample .17
Bibliography .18
ISO 20932-1:2018(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 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 the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 38, Textiles, Subcommittee SC 24,
Conditioning atmospheres and physical tests for textile fabrics.
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.
A list of all parts in the ISO 20932 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved

ISO 20932-1:2018(E)
Introduction
This document was developed as a result of technical advancements in yarn and fabric structures and
properties, which increase product range and developments.
[1]
This document is based on EN 14704-1 .
INTERNATIONAL STANDARD ISO 20932-1:2018(E)
Textiles — Determination of the elasticity of fabrics —
Part 1:
Strip tests
1 Scope
This document describes the methods of test using strips of fabric in straight strip form or as loops,
which can be used to measure elasticity and related properties of fabrics, excluding narrow fabrics.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 139, Textiles — Standard atmospheres for conditioning and testing
ISO 4915, Textiles — Stitch types — Classification and terminology
ISO 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1: Tension/
compression testing machines — Calibration and verification of the force-measuring system
ISO 10012, Measurement management systems — Requirements for measurement processes and measuring
equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
narrow fabric
woven or knitted construction intended for use as a trim, binding, edging, strapping or harness, and
designed to be used in its full width
3.2
elasticity
ability to recover original size and shape immediately after the removal of the force causing
deformation
3.3
constant-rate-of-extension testing machine
CRE testing machine
tensile testing machine provided with one clamp, which is stationary, and another clamp, which moves
with a constant speed throughout the test, the entire testing system being virtually free from deflection
ISO 20932-1:2018(E)
3.4
strip test specimen
test specimen in which the full width is gripped in the jaws of the testing machine
3.5
loop test specimen
test specimen in which a seam is made to create a loop of the full width of the specimen and which is
placed around a loop bar assembly positioned on the testing machine
Note 1 to entry: This method of preparation is useful when any ageing or exposure testing is to be carried out on
the specimens after measurement.
3.6
gauge length
distance between the two effective clamping or holding points of a testing device
Note 1 to entry: For strip tests, method A: distance between the two contact points of the line clamps.
Note 2 to entry: For loop tests, method B: half of the circumference around the loop bar assembly.
3.7
slack mounting
insertion of a strip test specimen (3.4) in the line clamps of the upper jaw, allowing it to hang freely
under its own weight, guided by the hand to ensure perpendicular alignment to the line of pulling force,
without any force being applied
3.8
initial length
length of the test specimen between the two effective clamping or holding points, at the beginning of
the test (after slack mounting (3.7) or under specified pretension)
3.9
pretension
force applied to a test specimen at the beginning of certain tests
Note 1 to entry: Pretension is used to determine the initial length of the test specimen.
[SOURCE: ISO 13934-1:2013, 3.5, modified — References to 3.4 and 3.7 have been removed from Note 1
to entry.]
3.10
extension
increase in length of a test specimen during testing
Note 1 to entry: Extension is expressed in units of the length.
3.11
elongation
ratio of the extension (3.10) of the test specimen to its initial length
Note 1 to entry: Elongation is expressed as a percentage.
3.12
maximum force
force at the position when a test specimen is taken to a fixed extension (3.10)
Note 1 to entry: Maximum force is expressed in newtons.
3.13
maximum extension
extension (3.10) recorded in millimetres at the position when a test specimen is taken to a fixed load
Note 1 to entry: Maximum extension is expressed in units of the length.
2 © ISO 2018 – All rights reserved

ISO 20932-1:2018(E)
3.14
force at specified elongation
force measured at a given elongation (3.11) on either the load or unload curves
3.15
cycle
process whereby a fabric is taken from the gauge length (3.6) to a fixed load or fixed extension or
elongation and returned to gauge length
3.16
force decay due to time
loss of force measured over time when a test specimen is stretched to a specified elongation or force
and held at this position for a given time period
Note 1 to entry: The decay in force is expressed as a percentage of the original force recorded at the specified
position (see Annex A, Figure A.1).
3.17
force decay due to exercising
loss of force, calculated and expressed as a percentage, as measured and recorded at the same elongation
point on two different cycles when the test specimen is cycled several times between the gauge length
(3.6) and a specified elongation
Note 1 to entry: See Annex A, Figure A.1.
3.18
permanent deformation
ratio of unrecovered extension of the test specimen after cycling (to a specified force or specified
extension) to its initial length
Note 1 to entry: Permanent deformation is expressed as a percentage.
3.19
recovered elongation
complement of permanent deformation (3.18) to 100 %
Note 1 to entry: Recovered elongation is expressed as a percentage.
3.20
elastic recovery
recovered elongation (3.19) of the total elongation
Note 1 to entry: Elastic recovery is expressed as a percentage.
4 Principle
A fabric test specimen of specified dimensions is extended at a constant rate to either a specified
force or elongation for an agreed number of cycles, and its elasticity determined by measuring certain
characteristics.
5 Sampling
Fabric samples shall be selected in accordance with the product specification. In the absence of a
product specification for the fabric, the sampling method given in Annex B may be used.
ISO 20932-1:2018(E)
6 Apparatus
6.1 CRE testing machine.
Metrological confirmation system of the tensile testing machine shall be in accordance with ISO 10012.
The constant-rate-of-extension (CRE) testing machine shall conform to the following.
a) The tensile testing machine shall be provided with the means for indicating or recording the force
and elongation values when cycling between gauge length and either a fixed load or fixed extension.
Under conditions of use, the accuracy of the apparatus shall be at least class 1 of ISO 7500-1. The
error of the indicated or recorded maximum force at any point in the range in which the machine
is used shall not exceed 1 %, and the error of the indicated or recorded jaw separation shall not
exceed 1 mm.
b) If recording of force or elongation is obtained by means of data acquisition boards and software,
the frequency of data collection shall be at least eight per second.
c) The machine shall be capable of constant rates of extension including 20 mm/min to 500 mm/min
with an accuracy of ±10 %.
d) The machine shall be capable of variable gauge length settings including 100 mm to 250 mm, to an
accuracy of ±1 mm.
e) The clamping or holding devices shall be positioned with their central point in line of the applied
force. The machine shall be calibrated with the clamping or holding devices in position and the jaw
faces closed, where applicable.
6.2 Line clamps (for method A).
The jaws shall be capable of holding the test specimen without allowing it to slip and designed so
...