IEC ISO/EC80079-20-1 OSI Edition 1.0 2017-12 NTERNATIONAL STANDARD NORME NTERNATIONALE colour inside Part 20-1: Material characteristics for gas and vapour classification - Test nethods and data Atmospheres explosives Partie 20-1: Caracteristiques des produits pour le classement des gaz et des vapeurs - Methodes et données d'essai THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright @ 2017 ISO/IEC, Geneva, Switzerland either IEc or IEC's member National Commitee in the country of the requester. If you have any questions about IsO/lEc copyright or have an enquiry about obtaining additionai rights to this publication, please contact the address beloworyourlocalIEC memberNational Committeeforfurther information. et les microfilms, sans I'accord écrit de I'IEc ou du Comite national de I'IEC du pays du demandeur. Si vous avez des questions sur le copyright de I'lSO/lEC ou si vous désirez obtenir des droits supplementaires sur cette publication, utilisez les coordonnees ci-apres oucontactez le Comitenational de I'lEC de votre pays de résidence. IEC Central Office Tel.: +4122 919 02 11 3, rue de Varembé Fax: +4122 919 03 00 CH-1211 Geneva 20 [email protected] Switzerland www.iec.ch About the IEC International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda oran amendment might have been published. IECCatalogue-webstore.iec.ch/catalogue Electropedia-www.electropedia.org The stand-alone application for consulting theentire The world's leading online dictionary of electronic and bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in Technical Specifications, Technical, Reports _and , other English and French, with equivalent terms in 16 additional documents.Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical iPad. Vocabulary (IEV) online. IECpublicationssearch-www.iec.ch/searchpub IECGlossary-std.iec.ch/glossary The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and varietyofcriteria(reference number, text, technical French extracted from the Terms and Definitions clause of committee,...). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and CISPR. IEc JustPublished-webstore.iec.ch/justpublished Stay up to date on all new IEC publications. Just Published IEc Customer Service Centre - webstore.iec.ch/csc details all new publications released.Available online and If you wish to give us your feedback on this publication or also once a month by email. need further assistance,please contact theCustomer Service Centre: [email protected]. A propos de I'IEC La Commission Electrotechnique Internationale (IEC) est la premiere organisation mondiale qui éelabore et publie des Normes internationales pour tout ce qui a trait a 'electricite, a i'electronique et aux technologies apparentees. AproposdespublicationsIEc Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez I'edition la plus recente, un corrigendum ouamendement peut avoir éte publié. Catalogue IEC-webstore.iec.ch/catalogue Electropedia-www.electropedia.org Application autonome pour consulter tous les renseignements Le premier dictionnaire en ligne de termes electroniques et bibliographiques sur les Normes internationales, Specifications techniques, Rapports techniques et autres électriques. Il contient 20 000 termes et definitions en anglais documents de I'EC. Disponible pour PC, Mac Os, tablettes et en francais,ainsi que les termes équivalents dans 16 Android et iPad. languesadditionnelles. EgalementappeleVocabulaire Electrotechnique International (I