ISO INTERNATIONAL STANDARD 2471 Fourth edition 2008-12-15 Paper and board Determination of opacity (paper backing) Diffuse reflectance method Papier et carton -Détermination de I'opacite sur fond papier- Methodederéflexionenlumierediffuse Reference number ISO 2471:2008(E) @ ISO 2008 yIHS under Not for Resale ISO 2471:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either isO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 . CH-1211 Geneva 20 Tel. + 4122 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @ ISO 2008 - All rights reserved I without license from IHS Not for Resale ISO 2471:2008(E) Contents Page Foreword Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Principle.. 5 Apparatus. 6 Sampling and conditioning 7 Preparation of test pieces.. 8 Procedure.... 9 Calculation of results 10 Precision. 11 Test report. AnnexA(normative)Spectralcharacteristicsof reflectometersformeasuring luminancefactor...........6 Bibliography. Copyright International Organization forStandardizalonghts reserved ii from IHS Not for Resi