BS ISO BRITISH STANDARD 8008:2005 Aluminium oxide primarily used for the production of aluminium : Determination of Specific surface area by nitrogen adsorption ICS 71.100.10 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BSISO8008:2005 National foreword This British Standard reproduces verbatim IS0 8008:2005 and implements it as the UK national standard. It supersedes BS 4140-23:1987 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee CII/24, Raw materials for the aluminium industry, which has the responsibility to: aid enquirers to understand the text; present to theresponsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Alistoforganizationsrepresentedonthiscommitteecanbeobtainedon request to its secretary. Cross-references TheBritishStandardswhichimplementinternationalpublicationsreferredto in thisdocument maybefoundin theBSI Catalogueunder the sectionentitled "International Standards Correspondence Index", or by using the “Search" facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was lastissued. This British Standard was Amendmentsissuedsincepublication published under the authority of the Standards Policy and Amd. No. Date Comments Strategy Committee on23January2006 C BSI 23 January 2006 ISBN 0580472981 BS ISO 8008:2005 ISO INTERNATIONAL STANDARD 8008 Second edition 2005-10-15 Aluminium oxide primarily usedfor the production of aluminium Determination of specific surface area by nitrogen adsorption Oxyded'aluminiumprincipalementutilisepourlaproduction de I'aluminium-Determinationdela surface specifiqueparadsorption d'azote Reference number ISO 8008:2005(E) ISO ii BSIS08008:2005 Contents Page 1 Scope 2 Normativereferences 3 Principle ... 4 Reagents 5 Apparatus 2 6 Samplingandsamplepreparation 2 7 Procedure. 3 8 Calculation and reporting of results ..... 4 9 Precision 4 10 Qualitycontrol... 4 11 Test report 4 Annex A (informative)Difference between single-and multi-point-determined BET SSA ... 6 Annex B(informative) Results of test programme 7 ili BSIS08008:2005 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies 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 main task of technical committees is to prepare International Standards.Draft International Standards 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 memberbodies casting a vote. rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO8008 was prepared by Technical Committee ISO/TC226,Materials for the production of primary aluminium This second edition cancels and replaces the first edition (ISO 8008:1986), which has been technically revised iv BSIS08008:2005 Introduction This International Standard is based on Australian Standard AS2879.4-2003,Alumina Determination of specificsurfaceareabynitrogenadsorption. >