EN IS0 21068-2 EUROPEANSTANDARD NORME EUROPEENNE EUROPAISCHE NORM June 2024 ICS 81.080 Supersedes EN IS0 21068-2:2008 English Version Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon- oxynitride and sialon - Part 2: Determination of volatile components, total carbon, free carbon, silicon carbide, total and free silicon. free and surface silica (Is0 21068 2:2024) Analyse chimique des matieres premieres et des Chemische Analyse von Rohstoffen und feuerfesten produits réfractaires contenant du carbure de silicium, Erzeugnissen, die Siliciumcarbid, Siliciumnitrid, du nitrure de silicium, de I'oxynitrure de silicium et du Siliciumoxinitrid und Sialon enthalten - Teil2: SiAlON - Partie 2: Dosage des composés volatils, du Bestimmung des Gehaltes an fluichtigen Bestandteilen, carbone total, du carbone libre, du carbure de silicium, Gesamtkohlenstoff,freiemKohlenstoff, Siliziumcarbid, du silicium total et libre et de la silice libre et gesamtem und freiem Silizium, freiem und superficielle (IS0 21068-2:2024) anhaltendem Siliziumdioxid (IS0 21068-2:2024) This European Standard was approved by CEN on 24 May 2024. 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. ThisEuropean Standard exists in three official versions (English,French, German).Aversion inany otherlanguage made by Centrehas the same status as the officialversions. 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 NorthMacedonia,Romania, Serbia,Slovakia,Slovenia,Spain, Sweden,Switzerland,Turkiyeand United Kingdom. cen EUROPEAN COMMITTEE FOR STANDARDIZATION COMITEEUROPEENDE NORMALISATION EUROPAISCHES KOMITEE FUR NORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels @2024CEN All rights of exploitation in any form and by any means reserved Ref. No. EN IS0 21068-2:2024 E worldwide for CEN national Members. EN IS0 21068-2:2024 (E) Contents Page European foreword... 2 EN IS0 21068-2:2024 (E) European foreword This document (EN IS0 21068-2:2024) has been prepared by Technical Committee IS0/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 December 2024, and conflicting national standards shall be withdrawn at the latest by December 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 IS0 21068-2:2008. 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, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkiye and the United Kingdom. Endorsement notice The text of IS0 21068-2:2024 has been approved by CEN as ENIS0 21068-2:2024 without any modification. 3