ISO INTERNATIONAL STANDARD 12625-16 First edition 2015-02-15 Tissue paper and tissue products Part 16: Determination of optical properties 一 Opacity (paper backing) — Diffuse reflectance method Papiertissueetproduitstissue Partie 16: Determination des propriétés optiques - Opacité sur fond papier -Méthode par reflexion en lumiere diffuse Reference number IS0 12625-16:2015(E) SO International Organization for Standardization @ IS0 2015 andardization5956617 ed without license from IHS IS0 12625-16:2015(E) COPYRIGHTPROTECTEDDOCUMENT ISO2015 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 copyright@iso.org Web www.iso.org Published in Switzerland Prganizationfor Standardization Not for Resale, 2015/6/2 06:24:15 networking permitted without license from IHS IS0 12625-16:2015(E) Contents Page Foreword ..iv Introduction. .. 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions 4 Principle ..2 5 Apparatus .2 5.1 Reflectometer. .2 5.2 Reference standards .3 5.3 Working standards .3 5.4 Black cavity .3 6 Sampling. 7 Conditioning. ..3 8 Preparation oftestpieces 9 Procedure ..4 10 Calculation ..5 11 Test report. ..5 Annex A (normative) Spectral characteristics of reflectometers for measuring luminous factor....6 Annex B (informative) Precision. .8 Bibliography .10 iii vided by IHS underI vithoutlicense from IHS