IWA 43:2023

Glass types — Crystal glass, crystal and lead crystal — Specifications and test methods

This document provides the specifications and specifies the requirements for the designation of three types of glass namely crystal glass, crystal, and lead crystal, according to their chemical composition, density and refractive index. This document also describes the test methods to measure the respective characteristics of these crystal glass types. Given the potential lead contamination concerns in crystal glass and crystal, this document additionally stipulates a maximum permissible limit for lead content. This document is applicable to the designated crystal glass types used as tableware, containers (e.g. bottles, decanters, perfume jars), giftware, home decor and any decorative components in consumer goods (e.g. glass components and/or parts used in jewellery, textile applications, and electrical and electronic equipment), furniture and luminaries. This document does not apply to crystal glass types used within the areas of construction, healthcare and laboratories, and other technical uses of glass.

Types de verres — Cristallin, cristal et cristal au plomb — Spécifications et méthodes d'essai

Le présent document fournit les spécifications et fixe les exigences pour la désignation de trois types de verres, à savoir le cristallin, le cristal et le cristal au plomb, en fonction de leur composition chimique, de leur masse volumique et de leur indice de réfraction. Le présent document décrit également les méthodes d’essai à appliquer pour mesurer les caractéristiques respectives de ces types de verres cristal. Étant donné les préoccupations existantes eu égard à la contamination potentielle par le plomb contenu dans le cristallin et le cristal, le présent document fixe, en outre, une limite maximale admissible de la teneur en plomb. Le présent document est applicable aux types de verres cristal désignés, utilisés comme vaisselle, récipients (par exemple bouteilles, carafes, flacons à parfum), articles de cadeaux, décoration intérieure et tous éléments décoratifs des produits de consommation (par exemple éléments en verre et/ou pièces utilisés en joaillerie, pour des applications sur textiles, et dans des équipements électriques et électroniques), articles d’ameublement et luminaires. Le présent document n’est pas applicable aux types de verres cristal utilisés dans les domaines de la construction, des soins de santé et des laboratoires, ni pour d’autres usages techniques du verre.

General Information

• Status: Published
• Publication Date: 08-Oct-2023
• ICS: 81.040.01 - Glass in general
• Technical Committee: ISO/TMBG - Technical Management Board - groups
• Drafting Committee: ISO/TMBG - Technical Management Board - groups
• Current Stage: 6060 - International Standard published
• Start Date: 09-Oct-2023
• Completion Date: 09-Oct-2023

Standards Content (Sample)

INTERNATIONAL IWA
WORKSHOP 43
AGREEMENT
First edition
2023-10
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
Reference number
© ISO 2023
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Published in Switzerland
ii
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
Foreword
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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.
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iv
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
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