ISO 1288-3:2016

INTERNATIONAL ISO
STANDARD 1288-3
First edition
Glass in building — Determination of
the bending strength of glass —
Part 3:
Test with specimen supported at two
points (four point bending)
Verre dans la construction — Détermination de la résistance du verre
à la flexion —
Partie 3: Essais avec éprouvettes supportées en deux points (flexion
quatre points)
PROOF/ÉPREUVE
Reference number
ISO 1288-3:2015(E)
©
ISO 2015

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ISO 1288-3:2015(E)

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ii © ISO 2015 – All rights reserved

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ISO 1288-3:2015(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Apparatus . 2
5.1 Testing machine . 2
5.2 Measuring instruments . 3
6 Sample . 3
6.1 Number of specimens . 3
6.2 Specimen dimensions . 3
6.3 Specimen condition and treatment . 3
6.4 Adhesive film . 4
7 Procedure. 4
7.1 Measuring width and thickness of each specimen . 4
7.2 Bending test . 4
8 Evaluation . 5
8.1 General . 5
8.2 Bending strength of the surface area, edges included . 5
8.3 Bending strength of the edges . 5
9 Test report . 6
Bibliography . 8
© ISO 2015 – All rights reserved PROOF/ÉPREUVE iii

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ISO 1288-3:2015(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.
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 160, Glass in building, Subcommittee SC 2, Use
considerations.
ISO 1288 consists of the following parts, under the general title Glass in building — Determination of the
bending strength of glass:
— Part 1: Fundamentals of testing glass
— Part 2: Coaxial double ring test on flat specimens with large test surface areas
— Part 3: Test with specimen supported at two points (four point bending)
— Part 4: Testing of channel shaped glass
— Part 5: Coaxial double ring test on flat specimens with small test surface areas
iv PROOF/ÉPREUVE © ISO 2015 – All rights reserved

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INTERNATIONAL STANDARD ISO 1288-3:2015(E)
Glass in building — Determination of the bending
strength of glass —
Part 3:
Test with specimen supported at two points (four point
bending)
1 Scope
This part of ISO 1288 specifies a method for determining the bending strength, including the effects
of the edges, of flat glass for use in building. The method specified can also be used to determine the
bending strength of the edges of glass separately.
The limitations of this part of ISO 1288 are described in ISO 1288-1.
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)
1)
ISO 1288-1 , Glass in building — Determination of the bending strength of glass — Part 1: Fundamentals
of testing glass
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
bending stress
tensile bending stress induced in the surface of a specimen
Note 1 to entry: For testing purposes, the bending stress should be uniform over a specified part of the surface.
3.2
effective bending stress
weighted average of the tensile bending stresses, calculated by applying a factor to take into account
non-uniformity of the stress field
3.3
bending strength
bending stress or effective bending stress which leads to breakage of the specimen
3.4
equivalent bending strength
apparent bending strength of patterned glass, for which the irregularities in the thickness do not allow
precise calculation of the bending stress
1) To be published.
© ISO 2015 – All rights reserv
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