Textile glass — Mats — Determination of tensile breaking force

ISO 3342:2011 specifies a method for the determination of the tensile breaking force of textile glass mats. The method is intended for chopped-strand mat but is equally applicable to certain types of continuous-strand mat usually intended for pultrusion.

Verre textile — Mats — Détermination de la force de rupture en traction

General Information

Status
Published
Publication Date
24-Nov-2011
Current Stage
9093 - International Standard confirmed
Start Date
16-Aug-2016
Completion Date
05-Oct-2021
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ISO 3342:2011 - Textile glass -- Mats -- Determination of tensile breaking force
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INTERNATIONAL ISO
STANDARD 3342
Fourth edition
2011-12-01
Textile glass — Mats — Determination of
tensile breaking force
Verre textile — Mats — Détermination de la force de rupture en traction
Reference number
ISO 3342:2011(E)
ISO 2011
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ISO 3342:2011(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2011

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s

member body in the country of the requester.
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Published in Switzerland
ii © ISO 2011 – All rights reserved
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ISO 3342:2011(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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

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.

ISO 3342 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13, Composites and

reinforcement fibres.

This fourth edition cancels and replaces the third edition (ISO 3342:1995), of which it constitutes a minor

revision. The main changes are as follows:
a) the normative references have been updated;
b) former Subclauses 5.2, 5.3 and 5.6 have been deleted;

c) explanatory footnotes concerning the terms “elementary unit” and “laboratory sample” have been added.

© ISO 2011 – All rights reserved iii
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INTERNATIONAL STANDARD ISO 3342:2011(E)
Textile glass — Mats — Determination of tensile breaking force
1 Scope

This International Standard specifies a method for the determination of the tensile breaking force of textile

glass mats.

The method is intended for chopped-strand mat but is equally applicable to certain types of continuous-strand

mat usually intended for pultrusion.
2 Normative references

The following referenced documents are indispensable for the application 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 291, Plastics — Standard atmospheres for conditioning and testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
tensile breaking force

maximum force required to break the test specimen in a tensile test carried to rupture

NOTE It is generally expressed in newtons.
4 Principle

A pre-conditioned test specimen of standard dimensions is subjected to tension by a suitable mechanical

device which indicates the tensile breaking force on a recorder or scale.

NOTE The test results might vary significantly depending on whether they are obtained on rolls of mat or on the mat

prior to winding into rolls (normally, the result is higher prior to winding). The method specified in this International Standard

describes the procedure for testing rolls of mat.
5 Apparatus
5.1 Tensile-testing machine.
5.1.1 All testing machines shall include the following elements.

a) A pair of suitable clamps to grip the specimen. They shall have a width of 160 mm and a minimum depth

of 25 mm. The faces of the clamps shall be plane and parallel, shall ensure uniform pressure over the

whole width of the test specimen and shall prevent it from slipping. The clamps shall also ensure, at all

times, alignment of the axis of the test specimen with the direction of the applied force. The initial distance

between the clamps shall be 200 mm.
b) A means for applying tension to the specimen.
© ISO 2011 – All rights reserved 1
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ISO 3342:2011(E)

c) A mechanism that will continuously indicate or record the force sustained by the specimen. The mechanism

shall be practically free from inertia at the specified speed of testing and shall indicate the force with an

accuracy within 1 % of the true value.

The reference machine is one having a constant rate of extension. Other types of test machine exist, e.g.

with constant rate of loading or constant rate of traverse. If only such machines are available, they may be

used subject to agreement between interested parties, but the results from different types of machine cannot

necessarily be compared.

5.1.2 The maximum error in the indicated force, at any point in the range in which the machine is used, shall

not exceed 1 % of the true force. The error in the length of specimen exposed between the clamps shall not

exceed 2 mm. The accuracy of the tensile-testing machine shall be verified, for example by means of calibrated

springs with appropriate characteristics.
5.2 Template for cutting out specimens.
For chopped-strand mat: polished template 150 mm wide and 316 mm long.
For continuous-strand mat for pultrusion applications:
...

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