ISO INTERNATIONAL STANDARD 20804 First edition 2022-05 Determination of the specific surface area of porous and particulate systems by small-angle X-ray scattering (SAXS) Détermination de la surface spécifique pour des systemes poreux et particulaires pardiffusion desrayonsXauxpetitsangles (SAxs) Referencenumber IS020804:2022(E) ISO @ISO2022 IS0 20804:2022(E) COPYRIGHTPROTECTEDDOCUMENT IS02022 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 anyform or by anymeans, electronic or mechanical, including photocopying, orposting on theinternetoran intranet,withoutpriorwrittenpermission.Permissioncanberequestedfrom eitherIsoattheaddressbelow or ISO's member body in the country of the requester. ISO copyright office CP401 : Ch.de Blandonnet 8 CH-1214 Vernier,Geneva Phone: +4122 749 0111 Email: copyright@iso.org Website:www.iso.org Published in Switzerland ii @IS0 2022-All rights reserved