ISO/TR TECHNICAL REPORT 18486 Second edition 2018-12 Plastics Parameters comparing the spectral irradiance of a laboratory light source for weathering applications to a reference solar spectral irradiance Plastiques - Parametres de comparaison de la distribution spectrale d'une source de lumiere de laboratoire pour les applications de vieillissement et d'une distribution spectrale solaire de reference Reference number ISO/TR 18486:2018(E) os1 @IS02018 IS0/TR 18486:2018(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2018 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 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: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2018 - All rights reserved IS0/TR 18486:2018(E) Contents Page Foreword .iv Introduction .V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Symbols. ..1 5 Significance 6 Requirements ? 7 Calculation methods .2 7.1 Characterizing parameter for a wavelength range .2 7.1.1 Choice of the wavelength range .2 7.1.2 Scaling condition 3 7.1.3 Characterizing parameter fi1-α2 for a wavelength range 4 7.2 Characterizing parameter for a known action spectrum 4 7.2.1 Choice of the wavelength range with action spectrum. ..4 7.2.2 Scaling condition with action spectrum. 4 7.2.3 Characterizing parameter fs(a)1-s(a)2 with action spectrum 5 Annex A (informative) Examples for parameters of some commercially available solar simulators. 6 Bibliography 8 @ IS0 2018 - All rights reserved ii