EN ISO 11426:2016
(Main)Jewellery - Determination of gold in gold jewellery alloys - Cupellation method (fire assay) (ISO 11426:2014)
Jewellery - Determination of gold in gold jewellery alloys - Cupellation method (fire assay) (ISO 11426:2014)
ISO 11426:2014 specifies a cupellation method (fire assay) for the determination of gold in gold jewellery alloys. The gold content of the alloys should preferably lie between 333 and 999 parts per thousand (?).
The procedure is applicable specifically to gold alloys incorporating silver, copper, and zinc. Some modifications are indicated where nickel and/or palladium are present in the so-called white gold alloys, as well as for alloys containing 990 or more parts per thousand (?) of gold.
ISO 11426:2014 is intended to be used as the recommended method for the determination of fineness in alloys covered by ISO 9202.
Schmuck - Bestimmung von Gold in Goldschmucklegierungen - Dokimastisches Verfahren (ISO 11426:2014)
Diese Internationale Norm legt ein dokimastisches Verfahren (Kupellationsverfahren) zur Bestimmung von Gold in Goldschmucklegierungen fest. Der Goldgehalt der Legierung sollte vorzugsweise zwischen 333 und 999 Promille (‰) liegen.
Das Verfahren ist besonders anwendbar für Goldlegierungen mit Silber, Kupfer und Zink. Einige Änderungen am Verfahren sind angezeigt, falls Nickel und/oder Palladium in sogenannten Weissgoldlegierungen vorhanden sind, ebenso für Legierungen die mehr als 990 Promille (‰) Gold enthalten.
Dieses Verfahren ist als empfohlenes Verfahren zur Bestimmung der Reinheit in Legierungen, wie in ISO 9202 vorgesehen, angegeben.
Joaillerie, bijouterie - Dosage de l'or dans les alliages d'or pour la bijouterie-joaillerie - Méthode de coupellation (essai au feu) (ISO 11426:2014)
ISO 11426:2014 prescrit une méthode de coupellation (essai au feu) permettant de doser l'or dans les alliages d'or pour la bijouterie-joaillerie. Il convient que la teneur en or des alliages se situe de préférence entre 333 millièmes et 999 millièmes (?) (en masse).
La méthode s'applique spécifiquement aux alliages d'or contenant de l'argent, du cuivre et du zinc. Certaines modifications sont indiquées lorsque du nickel, du palladium ou les deux sont présents dans ce qu'on appelle les alliages d'or gris, de même que pour les alliages ayant une teneur en or supérieure ou égale à 990 millièmes (?) (en masse).
ISO 11426:2014 spécifie une méthode destinée à servir de méthode recommandée pour la détermination du titre des alliages traités dans l'ISO 9202.
Nakit - Določanje zlata v nakitu - Odtopitev primesi v tekočem svincu (ISO 11426:2014)
Standard ISO 11426:2014 določa metodo odtopitve primesi v tekočem svincu za določanje zlata v zlitinah za zlati nakit. Vsebnost zlata v zlitinah bi morala biti med 333 in 999 delov na tisoč (?).
Postopek se uporablja predvsem za zlate zlitine, ki vsebujejo srebro, baker in cink. Pri nekaterih tako imenovanih zlitinah belega zlata in zlitinah, pri katerih je vsebnost zlata 990 delov na tisoč ali več (?), je označena prisotnost niklja in/ali paladija.
Standard ISO 11426:2014 je namenjen za uporabo kot priporočena metoda za določanje finosti v zlitinah, ki je zajeta v standardu ISO 9202.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2016
1DGRPHãþD
SIST EN ISO 11426:1999
1DNLW'RORþDQMH]ODWDYQDNLWX2GWRSLWHYSULPHVLYWHNRþHPVYLQFX ,62
Jewellery - Determination of gold in gold jewellery alloys - Cupellation method (fire
assay) (ISO 11426:2014)
Schmuck - Bestimmung von Gold in Goldschmucklegierungen - Dokimastisches
Verfahren (ISO 11426:2014)
Joaillerie, bijouterie - Dosage de l'or dans les alliages d'or pour la bijouterie-joaillerie -
Méthode de coupellation (essai au feu) (ISO 11426:2014)
Ta slovenski standard je istoveten z: EN ISO 11426:2016
ICS:
39.060 Nakit Jewellery
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 11426
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2016
EUROPÄISCHE NORM
ICS 39.060 Supersedes EN ISO 11426:1998
English Version
Jewellery - Determination of gold in gold jewellery alloys -
Cupellation method (fire assay) (ISO 11426:2014)
Joaillerie, bijouterie - Dosage de l'or dans les alliages Schmuck - Bestimmung von Gold in
d'or pour la bijouterie-joaillerie - Méthode de Goldschmucklegierungen - Dokimastisches Verfahren
coupellation (essai au feu) (ISO 11426:2014) (ISO 11426:2014)
This European Standard was approved by CEN on 2 October 2017.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11426:2016 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
The text of ISO 11426:2014 has been prepared by Technical Committee ISO/TC 174 “Jewellery” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 11426:2016.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2017, and conflicting national standards shall be
withdrawn at the latest by April 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN ISO 11426:1998.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 11426:2014 has been approved by CEN as EN ISO 11426:2016 without any modification.
INTERNATIONAL ISO
STANDARD 11426
Third edition
2014-12-15
Corrected version
2014-12-15
Jewellery — Determination of gold in
gold jewellery alloys — Cupellation
method (fire assay)
Joaillerie — Dosage de l’or dans les alliages d’or pour la bijouterie-
joaillerie — Méthode de coupellation (essai au feu)
Reference number
ISO 11426:2014(E)
©
ISO 2014
ISO 11426:2014(E)
© ISO 2014
All rights reserved. Unless otherwise specified, 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
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Published in Switzerland
ii © ISO 2014 – All rights reserved
ISO 11426:2014(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Reagents . 1
5 Apparatus . 2
6 Sampling . 3
7 Procedure. 3
7.1 General . 3
7.2 Yellow and red gold alloys, free of nickel, and palladium white gold alloys . 3
7.2.1 Assay sample . 3
7.2.2 Proof assay samples . 3
7.2.3 Cupellation and treatment of precious metal buttons . 3
7.2.4 Parting of the silver/gold samples . 3
7.3 White gold alloys containing nickel . 4
7.3.1 General. 4
7.3.2 Cupellation with additional lead . 4
7.3.3 Scorification . 4
7.4 White gold alloys containing palladium . 5
7.5 Gold alloys incorporating more than 40 % silver . 5
7.6 Alloys containing 999 ‰ gold. 5
8 Calculation and expression of results . 5
8.1 Proof assay sample factor . 5
8.2 Calculation of gold content . 6
8.3 Repeatability . 6
9 Test report . 6
Bibliography . 7
ISO 11426:2014(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 174, Jewellery.
This third edition cancels and replaces the second edition (ISO 11426:1997), which has been technically
revised with the following changes:
— change in the scope that this method is the referee method;
— change of requirement for sampling in Clause 6;
— addition of a warning in Clause 7 that suitable health and safety procedures should be followed;
— addition of red gold alloys in 7.2;
— addition of requirements in 7.3.1 for white gold alloys containing nickel and palladium;
— standard editorially revised.
This corrected version of ISO 11426:2014 incorporates the following correction:
— In 4.5, first dash: change of the value “999,99” into “999,9”.
iv © ISO 2014 – All rights reserved
ISO 11426:2014(E)
Introduction
The following definitions apply in understanding how to implement an ISO International Standard and
other normative ISO deliverables (TS, PAS, IWA).
— “shall” indicates a requirement
— “should” indicates a recommendation
— “may” is used to indicate that something is permitted
— “can” is used to indicate that something is possible, for example, that an organization or individual
is able to do something
ISO/IEC Directives, Part 2 (sixth edition, 2011), 3.3.1 defines a requirement as an “expression in the
content
...
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