ISO 3537:2015

INTERNATIONAL ISO
STANDARD 3537
Fourth edition
2015-04-15
Road vehicles — Safety glazing
materials — Mechanical tests
Véhicules routiers — Vitrages de sécurité — Essais mécaniques
Reference number
©
ISO 2015
© ISO 2015
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ii © ISO 2015 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test conditions . 1
5 Application of tests. 1
6 227 g ball test . 1
6.1 Principle . 1
6.2 Apparatus . 1
6.3 Test piece . 3
6.4 Procedure . 3
6.5 Expression of results . 3
7 2 260 g ball test . 3
7.1 Principle . 3
7.2 Apparatus . 4
7.3 Test piece . 4
7.4 Procedure . 4
7.5 Expression of results . 4
8 Abrasion resistance test . 4
8.1 Principle . 4
8.2 Apparatus . 4
8.3 Test pieces . 7
8.4 Standardization of abrading wheels . 7
8.5 Procedure . 8
8.6 Expression of results .10
9 Fragmentation test .10
9.1 Principle .10
9.2 Apparatus .11
9.3 Procedure .11
9.4 Expression of results .12
10 Head-form test .13
10.1 Principle .13
10.2 Apparatus .13
10.3 Procedure .15
10.3.1 Tests on flat test piece .15
10.3.2 Tests on complete windscreen .15
10.4 Expression of results .16
Annex A (informative) Vacuum pick-up nozzle modification .17
Annex B (informative) Calibration verification of Taber abraser .18
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 meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 35, Lighting
and visibility.
This fourth edition cancels and replaces the third edition (ISO 3537:1999), which has been technically
revised.
iv © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 3537:2015(E)
Road vehicles — Safety glazing materials — Mechanical tests
1 Scope
This International Standard specifies mechanical test methods relating to the safety requirements for
all safety glazing materials in a road vehicle, whatever the type of glass or other material of which they
are composed.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD
and 100 IRHD)
ISO 3536, Road vehicles — Safety glazing materials — Vocabulary
ISO 15082, Road vehicles — Tests for rigid plastic safety glazing materials
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 3536 apply.
4 Test conditions
Unless otherwise specified, the tests shall be carried out under the following conditions:
— Ambient temperature: 20 °C ± 5 °C;
— Atmospheric pressure: 86 kPa to 106 kPa (860 mbar to 1 060 mbar);
— Relative humidity: (60 ± 20) %.
5 Application of tests
For certain types of safety glazing materials, it is not necessary to carry out all the tests specified in this
International Standard.
6 227 g ball test
Rigid plastic safety glazing materials can alternatively be tested in accordance with ISO 15082.
6.1 Principle
Determination of whether the safety glazing material has a certain minimum strength and cohesion
under impact from a small hard object.
6.2 Apparatus
6.2.1 Hardness steel ball, with a mass of 227 g ± 2 g and a diameter of approximately 38 mm.
6.2.2 Means for dropping the ball freely from a height to be specified, or means for giving the ball
a velocity equivalent to that obtained by the free fall.
When a device to project the ball is used, the tolerance on velocity shall be ±1 % of the velocity equivalent
to that obtained by the free fall.
6.2.3 Supporting fixture, such as that shown in Figure 1, composed of two steel frames, with machined
borders, 15 mm wide, fitting one over the other and faced with rubber gaskets about 3 mm thick and
15 mm wide, of hardness 50 IRHD, determined in accordance with ISO 48.
The lower frame rests on a steel box, about 150 mm high. The test piece is held in place by the upper
frame, the mass of which is about 3 kg. The supporting frame is welded on a sheet of steel about 12 mm
thick, resting on the floor, with an interposed sheet of rubber, about 3 mm thick, of hardness 50 IRHD.
Dimensions in millimetres
Key
1 test piece
2 rubber gasket
3 sheet of rubber
Figure 1 — Support for ball tests
2 © ISO 2015 – All rights reserved

6.3 Test piece
+10
The test piece shall be a flat square with 300 mm mm sides or shall be cut out from the flattest part
of a windscreen or other curved safety glazing material.
Alternatively, the whole windscreen or other finished safety glazing products can be tested, using the
supporting fixture according to 6.2.3. In the case of curved test pieces, care shall be taken to ensure
adequate contact between the safety glazing material and the support.
6.4 Procedure
Temperature of test pieces: Ambient temperature.
The 227 g ball test can alternatively be carried out on test pieces at −20 °C ±
...