ISO INTERNATIONAL STANDARD 18757 First edition 2003-12-01 Fine ceramics (advanced ceramics, advanced technical ceramics) - Determination of specific surface area of ceramic powders by gas adsorption using the BET method Poudrescéramiques-DeterminationdeI'airemassique (surface specifique)paradsorptionde gaz a I'aidede lamethode BET Reference number ISO18757:2003(E) ISO @ISO 2003 ISO18757:2003(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and instailed on the computer performing the editing.In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the @ISO2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IsO at the address below or ISO's member body in the country of the requester. ISO copyright office Casepostale56·CH-1211Geneva20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ ISO 2003 -All rights reserved ISO18757:2003(E) Contents Page 1 Scope 2 Normativereferences Terms and definitions 3 4 Symbolsandabbreviatedterms 2 5 Principle 2 6 Procedure 3 6.1 General procedure 3 6.2 Sample preparation . 3 Experimental conditions ... 5 6.4 Evaluation of data ... 6 7 7 AnnexA(informative)Sample preparation-Outgassing 8 AnnexB(informative)Referencematerials 9 Bibliography 10 @ ISO 2003 - All rights reserved ili ISO18757:2003(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees.Each member body interested in a subject forwhich a technical committee has been 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. adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. 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 ISO18757waspreparedbyTechnical CommitteeISO/TC206,Fineceramics. iv ISO2003All rights reserved ISO 18757:2003(E) INTERNATIONALSTANDARD Fineceramics(advancedceramics,advancedtechnical ceramics)Determinationof specific surface area ofceramic 1 Scope This International Standard provides guidelines for the determination of the total specific external and internal surface area of disperse orporous (pore diameter>2 nm) fine ceramic materials by measuringthe amount of 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO9277:1995,Determinationof the specific surfaceareaofsolidsbygasadsorptionusingtheBETmethod 3Termsanddefinitions For the purposes of this document, the following terms and definitions apply 3.1 enrichment of the adsorbate at the external and accessible internal surfaces of a solid 3.2 physisorption weak bonding of the adsorbate, reversible by small changes in pressure or temperature 3.3 adsorbate measuring gas to be adsorbed 3.4 adsorbent solid, which ad