ISO INTERNATIONAL STANDARD 21475 First edition 2019-05 Plastics Methods of exposure to determine the wavelength dependent degradation using spectrally dispersed radiation Plastiques Méthodes d'exposition pour determiner la dégradation dépendante de la longueur d'onde en utilisant un rayonnement dispersé spectralement Reference number ISO 21475:2019(E) rso @IS02019 IS0 21475:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 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: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 21475:2019(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions ..1 4 Principle ..2 5 Apparatus .2 5.1 Exposure device. .2 5.2 Spectroradiometer. .3 5.3 Measuring device for property change .3 6 Test specimens. .3 6.1 Specimen preparation and conditioning .3 6.2 Specimen conditioning. 4 7 Exposure parameter. 4 7.1 Radiation. ..4 7.2 Specimen temperature .4 7.3 Testduration .5 8 Procedure ..5 8.1 Specimen optical and mechanical properties measurements .5 8.2 Mounting test specimens .5 8.3 Exposure .5 9 Test report 6 Annex A (informative) General information on the test method using spectrally dispersed radiation 7 Annex B (informative) Examples of devices for spectrally dispersed irradiation .9 Annex C (informative) Examples of test results ..11 Bibliography .18 @ IS0 2019 - All rights reserved ii