EN ISO 21068-1:2024

Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 1: General information, terminology and sample preparation (ISO 21068-1:2024)

This document gives definitions and specifies techniques for the preparation of samples for the chemical analysis of silicon-carbide-containing raw materials and refractory products including:
a)       SiC raw materials;
b)       graphite brick containing silicon carbide;
c)        silicon carbide brick (includes the bricks containing silicon nitride, silicon oxynitride, sialon);
d)       refractories containing carbon and/or silicon carbide mixed with clay;
e)       refractories containing carbon and/or silicon carbide mixed with silica (and fused silica);
f)         refractories containing carbon and/or silicon carbide mixed with high alumina material;
g)       refractories containing carbon and/or silicon carbide mixed with magnesia (and dolomite);
h)       refractories containing carbon and/or silicon carbide mixed with chrome mineral or magnesia-chrome materials;
i)         refractories containing carbon and/or silicon carbide except those described in a) to h) above.
The items of analysis described in ISO 21068-2, ISO 21068-3 and ISO 21068-4 are as follows:
—     loss on drying (LOD);
—     loss on ignition (LOI);
—     total carbon, Ctotal;
—     free carbon, Cfree;
—     silicon carbide, SiC;
—     free silicon (Sifree);
—     free aluminium (Alfree);
—     free magnesium (Mgfree);
—     free iron (Fefree);
—     silicon(IV) dioxide (SiO2);
—     aluminium(III) oxide (Al2O3);
—     iron(III) oxide (Fe2O3);
—     titanium(IV) oxide (TiO2);
—     calcium oxide (CaO);
—     magnesium oxide (MgO);
—     sodium oxide (Na2O);
—     potassium oxide (K2O);
—     chromium(III) oxide (Cr2O3);
—     zirconium(IV) oxide (ZrO2);
—     boron oxide (total boron calculated as B2O3);
—     nitrogen;
—     oxygen;
—     nitrides (undifferentiated: Si3N4, AlN, BN, sialon, oxy-nitrides, etc.);
—     mineralogical phases (XRD-methods).

Chemische Analyse von Rohstoffen und feuerfesten Erzeugnissen die Siliciumcarbid, Siliciumnitrid, Siliciumoxynitrid und Sialon enthalten - Teil 1: Allgemeine Angaben, Begriffe und Probenvorbereitung (ISO 21068‑1:2024)

Dieses Dokument legt Definitionen und Verfahren der Probenvorbereitung zur chemischen Analyse von Siliciumcarbid enthaltenden Rohstoffen und feuerfesten Erzeugnissen fest, einschließlich Folgendem:
a)   SiC-Rohstoffe;
b)   Graphitziegel, der Siliciumcarbid enthält;
c)   Siliciumcarbid-Ziegel (einschließlich Ziegel, die Siliciumnitrid, Siliciumoxynitrid, Sialon enthalten);
d)   feuerfeste Erzeugnisse, die Kohlenstoff und/oder Siliciumcarbid, gemischt mit Tonerde, enthalten;
e)   feuerfeste Erzeugnisse, die Kohlenstoff und/oder Siliciumcarbid, gemischt mit Siliciumdioxid (und Quarzglas), enthalten;
f)   feuerfeste Erzeugnisse, die Kohlenstoff und/oder Siliciumcarbid, gemischt mit Werkstoffen mit hohem Anteil an Aluminiumoxid, enthalten;
g)   feuerfeste Erzeugnisse, die Kohlenstoff und/oder Siliciumcarbid, gemischt mit Magnesiumoxid (und Dolomit) enthalten;
h)   feuerfeste Erzeugnisse, die Kohlenstoff und/oder Siliciumcarbid, gemischt mit Chrommineralien oder Magnesiumoxid-Chromoxid-Werkstoffen, enthalten;
i)   feuerfeste Erzeugnisse, die Kohlenstoff und/oder Siliciumcarbid enthalten und nicht unter a) bis h) aufgeführt sind.
Gegenstand der in ISO 21068 2, ISO 21068 3 und ISO 21068 4 beschriebenen Analysen ist Folgendes:
   Trocknungsverlust (LOD, en: loss on drying);
   Glühverlust (LOI, en: loss on ignition);
   Gesamtkohlenstoff Cgesamt;
   freier Kohlenstoff Cfrei;
   Siliciumcarbid SiC;
   freies Silicium (Sifrei);
   freies Aluminium (Alfrei);
   freies Magnesium (Mgfrei);
   freies Eisen (Fefrei);
   Silicium(IV)-oxid (SiO2);
   Aluminium(III)-oxid (Al2O3);
   Eisen(III)-oxid (Fe2O3);
   Titan(IV)-oxid (TiO2);
   Calciumoxid (CaO);
   Magnesiumoxid (MgO);
   Natriumoxid (Na2O);
   Kaliumoxid (K2O);
   Chrom(III)-oxid (Cr2O3);
   Zirconium(IV)-oxid (ZrO2);
   Boroxid (Gesamtbor, berechnet als B2O3);
   Stickstoff;
   Sauerstoff;
   Nitride (nicht unterschieden: Si3N4, AlN, BN, Sialon, Oxynitride usw.);
   mineralogischen Phasen (XRD-Verfahren).

Analyse chimique des matières premières et des produits réfractaires contenant du carbure de silicium, nitrure de silicium, oxynitrure de silicium et sialon - Partie 1: Informations générales, terminologie et préparation des échantillons (ISO 21068-1:2024)

Le présent document donne des définitions et spécifie des techniques de préparation des échantillons pour l'analyse chimique des matières premières et des produits réfractaires contenant du carbure de silicium comprenant:
a)       matières premières contenant du carbure du silicium;
b)       brique de graphite contenant du carbure de silicium;
c)        brique de carbure de silicium (inclut les briques contenant du nitrure de silicium, de l’oxynitrure de silicium, du SIAlON);
d)       réfractaires contenant du carbone et/ou du carbure de silicium mélangés à de l’argile;
e)       réfractaires contenant du carbone et/ou du carbure de silicium mélangés à de la silice (et de la silice vitreuse);
f)         réfractaires contenant du carbone et/ou du carbure de silicium mélangés à des matériaux à haute teneur en alumine;
g)       réfractaires contenant du carbone et/ou du carbure de silicium mélangés à de la magnésie (ou de la dolomite);
h)       réfractaires contenant du carbone et/ou du carbure de silicium mélangés à des minéraux contenant du chrome ou des matériaux de magnésie-chrome;
i)         réfractaires contenant du carbone et/ou du carbure de silicium sauf ceux décrits ci-dessus en a) et h).
L'ISO 21068-2, l'ISO 21068-3 et l'ISO 21068-4 décrivent des analyses chimiques sur:
—     la perte au séchage (LOD);
—     la perte au feu (LOI);
—     le carbone total, Ctotal;
—     le carbone libre, Clibre;
—     le carbure de silicium, SiC;
—     le silicium libre (Silibre);
—     l’aluminium libre (Allibre);
—     le magnésium libre (Mglibre);
—     le fer libre (Felibre);
—     l’oxyde de silicium (IV) (SiO2);
—     l’oxyde d'aluminium (Al2O3);
—     l’oxyde de fer (III) (Fe2O3);
—     l’oxyde de titane (IV) (TiO2);
—     l’oxyde de calcium (CaO);
—     l’oxyde de magnésium (MgO);
—     l’oxyde de sodium (Na2O);
—     l’oxyde de potassium (K2O);
—     l’oxyde de chrome (III) (Cr2O3);
—     l’oxyde de zirconium (ZrO2);
—     l’oxyde de bore (bore total calculé comme B2O3);
—     l’azote;
—     l’oxygène;
—     les nitrures (indifférencié: Si3N4, AlN, BN, SiAlON, oxynitrures, etc.);
—     les phases minéralogiques (méthodes de DRX).

Kemijska analiza surovin in ognjevzdržnih izdelkov, ki vsebujejo silicijev karbid, silicijev nitrid, silicijev oksinitrid in sialon - 1. del: Splošne informacije, terminologija in priprava vzorcev (ISO 21068-1:2024)

General Information

• Status: Published
• Publication Date: 14-May-2024
• ICS: 81.080 - Refractories
• Technical Committee: CEN/TC 187 - Refractory products and materials
• Drafting Committee: CEN/TC 187/WG 4 - Chemical analysis
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 15-May-2024
• Completion Date: 15-May-2024
• Ref Project: SIST EN ISO 21068-1:2024 - Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 1: General information, terminology and sample preparation (ISO 21068-1:2024)

Relations

• Replaces: EN ISO 21068-1:2008 - Chemical analysis of silicon-carbide-containing raw materials and refractory products - Part 1: General information and sample preparation (ISO 21068-1:2008)
• Effective Date: 17-Nov-2021

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2024
Kemijska analiza surovin in ognjevzdržnih izdelkov, ki vsebujejo silicijev karbid,
silicijev nitrid, silicijev oksinitrid in sialon - 1. del: Splošne informacije,
terminologija in priprava vzorcev (ISO 21068-1:2024)
Chemical analysis of raw materials and refractory products containing silicon-carbide,
silicon-nitride, silicon-oxynitride and sialon - Part 1: General information, terminology and
sample preparation (ISO 21068-1:2024)
Chemische Analyse von Rohstoffen und feuerfesten Erzeugnissen, die Siliziumcarbid,
Siliziumnitrid, Siliziumoxynitrid und Sialon enthalten - Teil1: Allgemeine Angaben und
Probenvorbereitung (ISO 21068-1:2024)
Analyse chimique des matières premières et des produits réfractaires contenant du
carbure de silicium, nitrure de silicium, oxynitrure de silicium et sialon - Partie 1:
Informations générales, terminologie et préparation des échantillons (ISO 21068-1:2024)
Ta slovenski standard je istoveten z: EN ISO 21068-1:2024
ICS:
71.040.40 Kemijska analiza Chemical analysis
81.080 Ognjevzdržni materiali Refractories
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 21068-1
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2024
EUROPÄISCHE NORM
ICS 81.080 Supersedes EN ISO 21068-1:2008
English Version
Chemical analysis of raw materials and refractory
products containing silicon-carbide, silicon-nitride, silicon-
oxynitride and sialon - Part 1: General information,
terminology and sample preparation (ISO 21068-1:2024)
Analyse chimique des matières premières et des Chemische Analyse von Rohstoffen und feuerfesten
produits réfractaires contenant du carbure de silicium, Erzeugnissen, die Siliziumcarbid, Siliziumnitrid,
nitrure de silicium, oxynitrure de silicium et sialon - Siliziumoxynitrid und Sialon enthalten - Teil1:
Partie 1: Informations générales, terminologie et Allgemeine Angaben und Probenvorbereitung (ISO
préparation des échantillons (ISO 21068-1:2024) 21068-1:2024)
This European Standard was approved by CEN on 4 May 2024.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21068-1:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 21068-1:2024) has been prepared by Technical Committee ISO/TC 33
"Refractories" in collaboration with Technical Committee CEN/TC 187 “Refractory products and
materials” the secretariat of which is held by BSI.
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 November 2024, and conflicting national standards
shall be withdrawn at the latest by November 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 21068-1:2008.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 21068-1:2024 has been approved by CEN as EN ISO 21068-1:2024 without any
modification.
International
Standard
ISO 21068-1
Second edition
Chemical analysis of raw materials
2024-05
and refractory products containing
silicon-carbide, silicon-nitride,
silicon-oxynitride and sialon —
Part 1:
General information, terminology
and sample preparation
Analyse chimique des matières premières et des produits
réfractaires contenant du carbure de silicium, nitrure de silicium,
oxynitrure de silicium et sialon —
Partie 1: Informations générales, terminologie et préparation des
échantillons
Reference number
ISO 21068-1:2024(en) © ISO 2024

ISO 21068-1:2024(en)
© ISO 2024
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 21068-1:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Sampling and preparation of the test sample . 4
4.1 General .4
4.2 Sample pre-treatment .4
4.2.1 General .4
4.2.2 Crushing .4
4.2.3 Thermal pre-treatment – Drying .4
5 Preliminary analyses . 5
6 Expression of results . 5
7 Test report . 5
Bibliography . 6

iii
ISO 21068-1:2024(en)
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,
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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.
This document was prepared by Technical Committee ISO/TC 33, Refractories, in collaboration with the
European Committee for Standardization (CEN) Technical Committee CEN/TC 187, Refractory products
and materials, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This second edition cancels and replaces the first edition (ISO 21068-1:2008), which has been editorially
and technically revised.
The main changes are as follows:
— The Scope was adjusted according to the Scope of the revised versions of ISO 21068-2, ISO 21068-3 and
ISO 21068-4;
— Table 1 was removed as this is now part of the revised versions of ISO 21068-2, ISO 21068-3 and
ISO 21068-4;
— The list of documents in Clause 2 has been adjusted;
— Clause 3 was adjusted to the revised versions of ISO 21068-2, ISO 21068-3 and ISO 21068-4;
— The weighing procedure has been removed as it can be assumed as general knowledge of the user of the
ISO 21068 series;
— Bibliography was adjusted to this document.
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
ISO 21068-1:2024(en)
Introduction
[1]
The ISO 21068 series has been developed from the combination of EN 12698-1:2007 and EN 12698-
[2] [3] [4] [5]
2:2007 and ISO 21068-1:2008 , ISO 21068-2:2008 and ISO 21068-3:2008 . The last three standards
[6]
have been originally developed from the combination of Japanese standard JIS R 2011:2007 and work items
developed within CEN. Because there is a wide variety of laboratory equipment in use, the most commonly
used methods are described.
[2]
ISO 21068-4 is derived from EN 12698-2:2007 describing XRD methods for the determination of
mineralogical phases typically apparent in nitride and oxynitride bonded silicon carbide refractory produ
...