ISO 3342:2011

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)
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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.
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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.
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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:
...