PRF IWA 43
(Main)Glass types — Crystal glass, crystal and lead crystal — Specifications and test methods
Glass types — Crystal glass, crystal and lead crystal — Specifications and test methods
Types de verres — Cristallin, cristal et cristal au plomb — Spécifications et méthodes d'essai
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© ISO 2023 – All rights reserved
INTERNATIONAL PRF IWA
WORKSHOP 43
AGREEMENT
ISO/TMBG
Secretariat: ISO
Date : 2023-06-1608-14
Glass types - — Crystal glass, crystal and lead crystal -—
Specifications and test methods
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PRF IWA 43:2023(:(E)
ii © ISO 2023 – All rights reserved
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PRF IWA 43:2023(:(E)
© ISO 2023
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
EmailE-mail: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland
© ISO 2023 – All rights reserved iii
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PRF IWA 43:2023(:(E)
Contents
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Specifications . 1
4.1 General . 1
4.2 Specifications for crystal glass . 2
4.3 Specifications for crystal . 2
4.4 Specifications for lead crystal . 2
5 Test methods . 3
5.1 Chemical composition . 3
5.2 Physical determinations . 3
5.2.1 Density . 3
5.2.2 Refractive index . 3
Annex A (informative) Crystal glass types specifications . 4
Annex B (informative) Workshop contributors . 5
Bibliography . 6
Foreword iv
Introduction v
4.1 General 1
4.2 Specifications for crystal glass 2
4.3 Specifications for crystal 2
4.4 Specifications for lead crystal 2
5.1 Chemical composition 2
5.2 Physical determinations 3
5.2.1 Density 3
5.2.2 Refractive index 3
Annex A (informative) Crystal glass types specifications 4
Annex B (informative) Workshop contributors 5
Bibliography 6
iv © ISO 2023 – All rights reserved
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PRF IWA 43:2023(:(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 document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directiveswww.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of
(a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received notice
of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
. ISO shall not be held responsible for
database available at www.iso.org/patents.www.iso.org/patents
identifying any or all such patent rights.
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.htmlwww.iso.org/iso/foreword.html.
International Workshop Agreement IWA 43 was approved at a workshop hosted by the Association
française de normalisation (Afnor), held in La Plaine Saint Denis, France, on 16 June 2023.
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.htmlwww.iso.org/members.html.
© ISO 2023 – All rights reserved v
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PRF IWA 43:2023(:(E)
Introduction
This International Workshop Agreement (IWA)This document is intended to provide specifications and
test methods for three crystal glass types (crystal glass, crystal, lead crystal) used in consumer goods in
relation to tableware, containers, furniture, home decor, jewellery and any other decorative components
in consumer goods. It will permitThe purpose is to promote a global understanding of consumer quality
requirements, together with a corresponding methodmethods to measure the specifications.
The three crystal glass types are determined alongbased on three criteria: chemical composition,
refractionrefractive index and density. A maximum lead content criterion is added for crystal and crystal
glass.
The refractive index depends on the chemical composition of glass. While lead oxide remains the most
efficient constituent to obtain a high refractionrefractive index because it favours general qualities (mass
purity, high transparency for non-coloured glass), other components such as calcium oxide, barium oxide,
zinc oxide may also contribute to a high refractive index.
vi © ISO 2023 – All rights reserved
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PRF IWA 43:(E)
Glass types – — Crystal glass, crystal and lead crystal –—
Specifications and test methods
1 Scope
This International Workshop
...
INTERNATIONAL IWA
WORKSHOP 43
AGREEMENT
First edition
Glass types — Crystal glass, crystal
and lead crystal — Specifications and
test methods
PROOF/ÉPREUVE
Reference number
IWA 43:2023(E)
© ISO 2023
---------------------- Page: 1 ----------------------
IWA 43:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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
ii
PROOF/ÉPREUVE © ISO 2023 – All rights reserved
---------------------- Page: 2 ----------------------
IWA 43:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Specifications . 1
4.1 General . 1
4.2 Specifications for crystal glass . 2
4.3 Specifications for crystal . . 2
4.4 Specifications for lead crystal . 2
5 Test methods . 2
5.1 Chemical composition . 2
5.2 Physical determinations . 3
5.2.1 Density . 3
5.2.2 Refractive index . 3
Annex A (informative) Crystal glass types specifications . 4
Annex B (informative) Workshop contributors. 5
Bibliography . 6
iii
© ISO 2023 – All rights reserved PROOF/ÉPREUVE
---------------------- Page: 3 ----------------------
IWA 43:2023(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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
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.
International Workshop Agreement IWA 43 was approved at a workshop hosted by the Association
française de normalisation (Afnor), held in La Plaine Saint Denis, France, on 16 June 2023.
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.
iv
PROOF/ÉPREUVE © ISO 2023 – All rights reserved
---------------------- Page: 4 ----------------------
IWA 43:2023(E)
Introduction
This document is intended to provide specifications and test methods for three crystal glass types
(crystal glass, crystal, lead crystal) used in consumer goods in relation to tableware, containers,
furniture, home decor, jewellery and any other decorative components in consumer goods. The purpose
is to promote a global understanding of consumer quality requirements, together with corresponding
methods to measure the specifications.
The three crystal glass types are determined based on three criteria: chemical composition, refractive
index and density. A maximum lead content criterion is added for crystal and crystal glass.
The refractive index depends on the chemical composition of glass. While lead oxide remains the most
efficient constituent to obtain a high refractive index because it favours general qualities (mass purity,
high transparency for non-coloured glass), other components such as calcium oxide, barium oxide, zinc
oxide may also contribute to a high refractive index.
v
© ISO 2023 – All rights reserved PROOF/ÉPREUVE
...
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