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INTERNATIONAL ISO
STANDARD 9073-18
Second edition
2023-11
Nonwovens — Test methods —
Part 18:
Determination of tensile strength and
elongation at break using the grab
tensile test
Nontissés — Méthodes d’essai —
Partie 18: Détermination de la résistance à la traction et de
l’allongement à la rupture par l’essai d’arrachement par traction
Reference number
© ISO 2023
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Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Reagents and materials . 3
6 Apparatus . 3
7 Sampling . 4
7.1 Lot sampling . 4
7.2 Laboratory sample . 5
7.3 Test specimens. 5
8 Conditioning . 5
9 Preparation of test specimens . 6
9.1 General . 6
9.2 Dimensions . 6
9.3 Marking on the test specimen . 6
9.4 Wet test specimens . 6
10 Preparation, calibration and verification of apparatus . 7
10.1 Tensile testing machine . 7
10.2 Clamping system . 7
10.3 Verification of the total operating system of the apparatus . 7
11 Procedure . 8
11.1 Gauge length . 8
11.2 Rate of extension . 8
11.3 Mounting of test specimens . 8
11.4 Operation . 8
11.4.1 General . 8
11.4.2 Slippage. 8
11.4.3 Jaw breaks . 9
12 Calculation . 9
12.1 Breaking force . 9
12.2 Apparent elongation . 9
13 Expression of results .9
14 Precision and bias . 9
15 Test report . 9
Annex A (informative) Possible causes of low precision when grab strength testing .11
Bibliography .12
iii
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 document 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).
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
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 38, Textiles, in collaboration with the
European Committee for Standardization (CEN) Technical Committee CEN/TC 248, Textiles and textile
products, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This second edition cancels and replaces the first edition (ISO 9073-18:2007), which has been
technically revised.
The main changes are as follows:
— the title has been changed from "Determination of breaking strength and elongation of nonwoven
material using the grab tensile test" to "Determination of tensile strength and elongation at break
suing the grab tensile test";
— the Scope has been clarified and made precise;
— new terms have been added to the list of terms in Clause 3;
— new following new Clauses have been added and subsequent clauses have been renumbered:
— Clause 7, Sampling;
— Clause 8, Conditioning;
— Clause 9, Preparation of specimens;
— Clause 10, Preparation, calibration and verification of apparatus;
— Clause 13, Expression of results;
iv
— Clause 14, Precision and bias.
A list of all parts in the ISO 9073 series can be found on the ISO website.
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.
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INTERNATIONAL STANDARD ISO 9073-18:2023(E)
Nonwovens — Test methods —
Part 18:
Determination of tensile strength and elongation at break
using the grab tensile test
SAFETY WARNING — This document does not claim to address all of the safety concerns, if
any, associated with its use. It is the responsibility of the user of this document to establish
appropriate safety and health practices and determine the applicability of regulatory limitations
prior to use. It is expected that the person performing this test has been fully trained in all
aspects of this procedure.
1 Scope
This document specifies a test method for the determination of the breaking force of nonwovens using
a grab method in conditioned or wet state.
This test method is not applicable to materials which have a high percentage of stretch. Comparing test
results from tensile testing machines operating on different principles is not applicable.
This document specifies methods using constant rate of specimen extension (CRE) tensile testers.
Constant-rate-of-loading (CRL) instruments is covered, for information, in ISO 2062:2009, Annex A, in
recognition of the fact that these instruments are still in use and can be used by agreement.
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 186, Paper and board — Sampling to determine average quality
ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 3951-1, Sampling procedures for inspection by variables — Part 1: Specification for single sampling
plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection for a single quality characteristic
and a single AQL
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the fo
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