ISO INTERNATIONAL STANDARD 22891 Second edition 2013-03-01 Paper Determination of transmittance by diffuse reflectance measurement Papier- Détermination de la transmittance par le mesurage de la reflectance diffuse Reference number IS0 22891:2013(E) LSO IS02013 IHS under ted without license from IHS Not for Resale IS0 22891:2013(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2013 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2013 - All rights reserved networking permitted without license from IHS Not for Resale IS0 22891:2013(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normativereferences 3 Terms and definitions 4 Principle .3 5 Apparatus ..3 6 Sampling. ..4 7 Preparation oftest pieces ..4 8 Procedure ..4 9 Calculation ..4 10 Test report .5 Annex A (normative) Spectral characteristics of reflectometers for measuring luminous .6 reflectancefactors Annex B (informative) Relationship between transmittance and opacity ...8 Annex C (informative) Precision 9 Bibliography .11 iii se with IS thout license from IHS Not for Resale