SIST EN ISO 4674-2:1999

SLOVENSKI STANDARD
SIST EN ISO 4674-2:1999
01-marec-1999
*XPLUDQHLQSODVWLILFLUDQHWHNVWLOLMH8JRWDYOMDQMHQDGDOMQHWUJDOQHWUGQRVWLGHO
0HWRGDSDGDMRþHJDQLKDOD,62
Rubber- or plastics-coated fabrics - Determination of tear resistance - Part 2: Ballistic
pendulum method (ISO 4674-2:1998)
Mit Kautschuk oder Kunststoff beschichtete Textilien - Bestimmung der
Weiterreißfestigkeit - Teil 2: Verfahren mit ballistischem Pendel (ISO 4674-2:1998)
Supports textiles revetus de caoutchouc ou de plastique - Détermination de la résistance
au déchirement - Partie 2: Méthode au mouton-pendule (ISO 4674-2:1998)
Ta slovenski standard je istoveten z: EN ISO 4674-2:1998
ICS:
59.080.40 3RYUãLQVNRSUHYOHþHQH Coated fabrics
WHNVWLOLMH
SIST EN ISO 4674-2:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN ISO 4674-2:1999

---------------------- Page: 2 ----------------------

SIST EN ISO 4674-2:1999

---------------------- Page: 3 ----------------------

SIST EN ISO 4674-2:1999

---------------------- Page: 4 ----------------------

SIST EN ISO 4674-2:1999
INTERNATIONAL ISO
STANDARD 4674-2
First edition
1998-05-01
Rubber- or plastics-coated fabrics —
Determination of tear resistance —
Part 2:
Ballistic pendulum method
Supports textiles revêtus de caoutchouc ou de plastique — Détermination
de la résistance au déchirement —
Partie 2: Méthode au mouton-pendule
A
Reference number
ISO 4674-2:1998(E)

---------------------- Page: 5 ----------------------

SIST EN ISO 4674-2:1999
ISO 4674-2:1998(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.
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.
International Standard ISO 4674-2 was prepared by Technical Committee
ISO/TC 45, Rubber and rubber products.
Together with part 1 of ISO 4674, this first edition of ISO 4674-2 cancels
and replaces the first edition of ISO 4674 (ISO 4674:1977), which has been
technically revised.
ISO 4674 consists of the following parts, under the general title Rubber- or
plastics-coated fabrics — Determination of tear resistance:
— Part 1: Constant rate of tear methods
— Part 2: Ballistic pendulum method
Annex A forms an integral part of this part of ISO 4674.
©  ISO 1998
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 the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet central@iso.ch
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii

---------------------- Page: 6 ----------------------

SIST EN ISO 4674-2:1999
©
ISO ISO 4674-2:1998(E)
Introduction
Tearing is amongst the more usual ways of destruction for many thin
materials such as paper, coated or uncoated textiles, plastics films and
leather. Knowledge of the resistance of these materials to this type of
behaviour is therefore very important.
In practice, tearing can result from very different circumstances; hence the
large number of test methods that have been developed in order to predict
the behaviour of materials in various situations.
The present International Standard deals with initiated tearing, i.e. the
propagation of a tear from an initiating cut. It consists of the following two
parts:
— Part 1: Constant rate of tear methods;
— Part 2: Ballistic pendulum method.
The first part describes two methods using a tensile-testing machine at
constant rate of elongation. The second part describes a dynamic method
using the kinetic energy of a falling pendulum.
Other methods, for example the "wounded burst test", are under
consideration as possible further parts.
iii

---------------------- Page: 7 ----------------------

SIST EN ISO 4674-2:1999

---------------------- Page: 8 ----------------------

SIST EN ISO 4674-2:1999
©
INTERNATIONAL STANDARD  ISO ISO 4674-2:1998(E)
Rubber- or plastics-coated fabrics — Determination of tear
resistance —
Part 2:
Ballistic pendulum method
WARNING — Persons using this part of ISO 4674 should be familiar with normal laboratory practice.
This part of ISO 4674 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 part of this ISO 4674 describes a method for the determination of tear resistance based on the action
of an active force applied to a notched test piece.
The test may be carried out on:
— test pieces that have been conditioned in a standard atmosphere, or
— test pieces that have undergone pre-treatment, e.g. water immersion.
The results obtained by this method are not to be compared with those obtained by methods involving
constant rate of tear.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
part of ISO 4674. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this part of ISO 4674 are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO
maintain registers of currently valid International Standards.
ISO 2231:1989, Rubber- or plastics-coated fabrics — Standard atmospheres for conditioning and testing.
ISO 2286-2:1998, 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.
3 Principle
A sudden force is applied to a notched test piece. This force is generated by a pendulum. The amplitude of
the first oscillation enables the tearing force to be measured.
1

---------------------- Page: 9 ----------------------

SIST EN ISO 4674-2:1999
©
ISO
ISO 4674-2:1998(E)
4 Apparatus
4.1 Test machine of the pendulum type, in which the test piece is held between two jaws, one
movable and the other fixed, the clamping faces of which shall be in the same plane when the apparatus is
in its starting position. The moving jaw is attached to a pendulum which can fall under the influence of
gravity.
The apparatus is made up of the following parts:
4.1.1 Rigid framework, supporting the pendulum and the fixed jaw, as well as the knife and measuring
device.
It is fitted with a level and positioned to prevent any movement during the test, for example by securing it by
means of threaded bolts on a rigid table.
4.1.2 Pendulum, that is free to swing about a horizontal axis on roller bearings, with means for holding
the pendulum in the raised starting position and releasing it instantly. The weight of the pendulum may be
altered by adding additional masses or by exchanging pendulums, thus giving the possibility of several
measuring scales.
4.1.3 Mechanical or electronic device, for determining the maximum amplitude of the first swing, and
thus the energy used to tear the test piece. The reading may be given directly in terms of tearing force.
4.1.4 Movable jaw, integral with the pendulum, and fixed jaw, integral with the framework.
These jaws shall be 2,8 mm ± 0,3 mm apart in order to permit the passage of the knife.
When the pendulum is in its starting position, the clamping faces of the
...