ISO INTERNATIONAL 13837 STANDARD Second edition 2021-09 Road vehicles - Safety glazing materials Method for the determination of solar transmittance Vehiculesroutiers-Vitrages desecurité-Methodede détermination du facteur de transmission du rayonnement solaire Referencenumber IS0 13837:2021(E) ISO @IS0 2021 IS0 13837:2021(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 any form or by any means, electronic or mechanical, including photocopying, or posting below or Iso's member body in the country of the requester. ISO copyright office CP 40i: Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland i IS0 2021-All rights reserved IS013837:2021(E) Contents Page Foreword ..iv Introduction .. i 1 Scope. ..1 2 Normative references ..1 3 Terms,definitions and symbols ..1 3.1 Terms and definitions ..1 3.2 Symbols. ..1 4 Apparatus. .2 5 Procedure. .2 5.1 Samplepreparation .2 5.2 Measurement .3 5.3 Calculation method .3 5.3.1 Luminoustransmittance[T] .3 5.3.2 Solar UV transmittance [Tuv(380) ] 3 5.3.3 SolarUV transmittance [Tuv(400) ] .3 5.3.4 Solar direct transmittance [Te] .3 5.3.5 Solar direct reflectance [ Re] .3 5.3.6 Solardirectabsorbance[ae] .4 5.3.7 Total solar transmittance [Trs]. 4 5.3.8 Colorimetry. ..5 6 Expression of results .6 AnnexA (informative)Derivation of solar weighttable .10 Bibliography. .12 @ IS0 2021 - All rights reserved iii