Glass in building — Glass blocks — Specification and test methods

This document specifies requirements for the properties of glass blocks used for the construction of non-load-bearing walls and horizontally spanning panels. This document also specifies test methods used to verify these properties for square, rectangular and circular glass blocks.

Verre dans la construction — Briques de verre — Spécification et méthodes d'essai

General Information

Status
Published
Publication Date
15-Nov-2021
Current Stage
6060 - International Standard published
Start Date
16-Nov-2021
Completion Date
16-Nov-2021
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ISO 21690:2021 - Glass in building -- Glass blocks -- Specification and test methods
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INTERNATIONAL ISO
STANDARD 21690
Second edition
2021-11
Glass in building — Glass blocks —
Specification and test methods
Verre dans la construction — Briques de verre — Spécification et
méthodes d'essai
Reference number
ISO 21690:2021(E)
© ISO 2021
---------------------- Page: 1 ----------------------
ISO 21690:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 21690:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Symbols .......................................................................................................................................................................................................................... 2

5 Types of glass block ........................................................................................................................................... ................................................2

5.1 Categories.................................................................................................................................................................................................... 2

5.2 Shapes of glass block ......................................................................................................................................................................... 3

5.3 Surface aspect and treatment ................................................................................................................................................... 3

6 Dimensional tolerances ................................................................................................................................................................................ 4

6.1 Methods ........................................................................................................................................................................................................ 4

6.2 Hollow glass block face thickness .......................................................................................................................................... 4

6.3 External dimensions ......................................................................................................................................................................... 4

7 Irregularities inherent to the production of hollow glass block ......................................................................4

7.1 Dimensional irregularities measurement method ................................................................................................. 4

7.1.1 Welded seam protrusion ............................................................................................................................................. 4

7.1.2 Twisting or misalignment .......................................................................................................................................... 5

7.1.3 Face depressions or bulge .......................................................................................................................................... 5

7.2 Dimensional irregularities limitation ................................................................................................................................ 5

8 Appearance for hollow glass blocks ................................................................................................................................................6

8.1 Method ........................................................................................................................................................................................................... 6

8.2 Appearance requirements ........................................................................................................................................................... 6

9 Mechanical properties ...................................................................................................................................................................................7

9.1 Compressive strength of hollow glass blocks ............................................................................................................. 7

9.2 Applied load test ................................................................................................................................................................................... 7

10 Thermal shock resistance for hollow glass blocks .......................................................................................................... 7

Annex A (normative) Mechanical resistance test procedures ................................................................................................. 8

Annex B (informative) Mechanical resistance test procedures — Thermal shock test

procedures ..............................................................................................................................................................................................................11

Bibliography .............................................................................................................................................................................................................................12

iii
© ISO 2021 – All rights reserved
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ISO 21690:2021(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 of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to

the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see

www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 160, Glass in building, Subcommittee SC 1,

Product considerations.

This second edition cancels and replaces the first edition (ISO 21690:2006), which has been technically

revised.
The main changes compared to the previous edition are as follows:
— Clause 5 in the previous edition on materials has been deleted;
— the external dimensions has been changed to one value ±1,5 mm in 6.3;

— the dimensional irregularities twisting Δt or misalignment Δm have been changed to not exceed

1,5 mm in 7.2;

— subclause 6.2.2 in the previous edition on visual irregularities has been changed to Clause 8 on the

appearance for hollow glass blocks, including its test method and requirement;

— the compressive strength minimum value in the previous edition subclause 6.3.1 has been changed

2 2
from 6,0 N/mm to 4,4 N/mm in 9.1;

— Clause 10 on thermal shock resistance for hollow glass blocks, with a 40 °C temperature falling, has

been added;

— subclause 6.3.3 in the previous edition on thermal properties has been deleted;

— subclause 6.3.4 in the previous edition on radiation properties has been deleted.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
© ISO 2021 – All rights reserved
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ISO 21690:2021(E)
Introduction

Light transmitting glass blocks are used for the construction of building elements both in non-load

bearing walls and load bearing horizontally spanning panels.

Glass blocks for non-load bearing walls carry only their own weight and withstand horizontal forces

such as those generated by the wind. Glass block walls and horizontally spanning panels do not carry

any forces generated by the building.

Glass blocks used for the construction of horizontally spanning panels (e.g. floors, vaults and domes)

carry their own weight and any other imposed loads (e.g. pedestrian or vehicular traffic).

© ISO 2021 – All rights reserved
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INTERNATIONAL STANDARD ISO 21690:2021(E)
Glass in building — Glass blocks — Specification and test
methods
1 Scope

This document specifies requirements for the properties of glass blocks used for the construction of

non-load-bearing walls and horizontally spanning panels. This document also specifies test methods

used to verify these properties for square, rectangular and circular glass blocks.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition
...

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