ISO 1288-5:2016

INTERNATIONAL ISO
STANDARD 1288-5
First edition
Glass in building — Determination of
the bending strength of glass —
Part 5:
Coaxial double-ring test on flat
specimens with small test surface areas
Verre dans la construction — Détermination de la résistance du verre
à la flexion —
Partie 5: Essais avec doubles anneaux concentriques sur éprouvettes
planes, avec de petites surfaces de sollicitation
PROOF/ÉPREUVE
Reference number
ISO 1288-5:2015(E)
©
ISO 2015
ISO 1288-5:2015(E)
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

ISO 1288-5:2015(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 1
5 Principle of test method . 2
6 Apparatus . 3
6.1 Testing machine . 3
6.2 Loading device. 3
6.3 Measuring instruments . 5
7 Sample . 5
7.1 Shape and dimensions of specimens . 5
7.2 Sampling and preparation of specimens . 6
7.2.1 Cutting and handling . 6
7.2.2 Conditioning . 6
7.2.3 Examination . 6
7.2.4 Adhesive film . 6
7.3 Number of specimens . 6
8 Procedure. 6
8.1 Temperature . 6
8.2 Humidity . 6
8.3 Thickness measurement . 6
8.4 Base plate . 6
8.5 Positioning of specimen and loading ring . 7
8.6 Load application . 7
8.7 Location of the origin . 7
8.8 Assessment of residual stresses . 7
9 Evaluation . 7
9.1 Limitation of the evaluation . 7
9.2 Calculation of bending strength . 8
10 Test report . 8
Bibliography . 9
ISO 1288-5:2015(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).
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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 in conjunction with Technical Committee CEN/TC 129, Glass in building.
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
This International Standard has been based on EN 1288-5, Glass in building — Determination of the
bending strength of glass — Part 5: Coaxial double-ring test on flat specimens with small test surface areas
prepared by Technical Committee CEN/TC 129 “Glass in building”.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and the United Kingdom.
iv PROOF/ÉPREUVE © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 1288-5:2015(E)
Glass in building — Determination of the bending
strength of glass —
Part 5:
Coaxial double-ring test on flat specimens with small test
surface areas
1 Scope
This part of ISO 1288 specifies a method for determining the comparative bending strength of glass for
use in buildings, excluding the effects of the edges.
See ISO 1288-1, 5.1.4 for an explanation as to why this test method should only be used for comparing
the strength of types of glass and not for assessing strength for design purposes.
The limitations of this part of ISO 1288 are described in ISO 1288-1.
ISO 1288-1 should be read in conjunction with this part of ISO 1288.
This test method is not suitable for patterned glass.
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)
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.
4 Symbols
F load N
F load at breakage, “breaking load” N
max
h thickness of specimen m
L side length of square specimens m
K ,K constants for calculation of bending stress
1 2
ISO 1288-5:2015(E)
r radius of loading ring m
r radius of supporting ring m
r radius of circular specimens m
r average specimen radius (for evaluation)
...