ISO INTERNATIONAL STANDARD 7203-4 First edition 2022-01 Fire extinguishing media Foam concentrates Part 4: Specification for Class A foam concentrates for application on Class A fires Agentsextincteurs-Emulseurs- Partie 4: Specifications pour les agents émulseurs destines a une application par les matieres solide combustible Reference number ISO 7203-4:2021(E) ISO @IS0 2021 Copyright Intemational Organization for Standardization IS0 7203-4:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 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 any means, electronic or mechanical, including photocopying,or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch.de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website:www.iso.org Published in Switzerland Cymaan IS02021-Allrightsreserved IS0 7203-4:2021(E) Contents Page Foreword. ..V Introduction. ..vi 1 Scope. 2 Normativereferences 3 Terms and definitions 4 Type and use of Class A foam concentrates ..3 4.1 .3 General 4.2 Use with sea water. .3 5 Toleranceofthefoam concentratetofreezing and thawing .3 6 Sediment in the foam concentrate .4 6.1 Sediment before ageing .4 6.2 Sediment after ageing. ..4 7 Determination ofviscosity .4 7.1 Newtonianfoam concentrates .4 7.2 Pseudo-plastic foam concentrates ..4 ..4 8 pH ofthefoam concentrate 8.1 pH limits.. .4 8.2 Sensitivityto temperature ..4 9 Surfacetensionofthefoamsolution 9.1 Before temperature conditioning .4 9.2 Temperature sensitivity .5 10 Expansion and drainage of foam .5 10.1 Expansion .5 ..5 10.1.1Limits 10.2 Drainage .5 10.2.1Limits .5 11 Test fire performance .5 12 Corrosion ..5 13 Toxicology and environmental information 14 Marking, packaging and specification sheet .5 14.1 Marking .5 14.2 Packaging. .6 14.3 Specification sheet .6 AnnexA (normative)Preliminarysamplingandconditioningofthefoamconcentrate .7 AnnexB (normative)Determinationoftolerancetofreezingandthawing .8 AnnexC(normative)Determinationofpercentageofsediment. ..10 AnnexD(normative)Determinationofviscosityforpseudo-plasticfoamconcentrates ..11 AnnexE(normative)Determinationofsurfacetension ..13 AnnexF (normative)Determination of expansion and drainagetime ..14 AnnexG(normative)Determinationoffiretestperformance ..20 ..22 Annex H (normative) Toxicology and environmental information AnnexI (informative)Compatibility. .23 AnnexJ (normative)Determinationofviscosityusingarotationalviscometerwith defined .24 shearrate iii Copyigh Intemainal orghIS0i292ara2Al1 rights reserved