EN ISO 12625-16:2024

SLOVENSKI STANDARD
01-julij-2024
Tissue (svileni) papir in proizvodi iz tissue papirja - 16. del: Ugotavljanje optičnih
lastnosti - Metoda razpršene odsevnosti za opaciteto (papirna podlaga) (ISO 12625
-16:2024)
Tissue paper and tissue products - Part 16: Determination of optical properties - Diffuse
reflectance method for opacity (paper backing) (ISO 12625-16:2024)
Tissue-Papier und Tissue-Produkte - Teil 16: Bestimmung der optischen Eigenschaften -
Opazität über Papierstapel - Diffuser Reflexionsfaktor (ISO 12625-16:2024)
Papier tissue et produits tissue - Partie 16: Détermination des propriétés optiques -
Méthode par réflectance diffuse de l'opacité sur fond papier (ISO 12625-16:2024)
Ta slovenski standard je istoveten z: EN ISO 12625-16:2024
ICS:
85.080.20 Tissue papir Tissue paper
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 12625-16
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2024
EUROPÄISCHE NORM
ICS 85.080.20 Supersedes EN ISO 12625-16:2015
English Version
Tissue paper and tissue products - Part 16: Determination
of optical properties - Diffuse reflectance method for
opacity (paper backing) (ISO 12625-16:2024)
Papier tissue et produits tissue - Partie 16: Tissue-Papier und Tissue-Produkte - Teil 16:
Détermination des propriétés optiques - Méthode par Bestimmung der optischen Eigenschaften - Opazität
réflectance diffuse de l'opacité sur fond papier (ISO über Papierstapel - Diffuser Reflexionsfaktor (ISO
12625-16:2024) 12625-16:2024)
This European Standard was approved by CEN on 4 May 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12625-16:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 12625-16:2024) has been prepared by Technical Committee ISO/TC 6 "Paper,
board and pulps" in collaboration with Technical Committee CEN/TC 172 “Pulp, paper and board” the
secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2024, and conflicting national standards
shall be withdrawn at the latest by November 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 12625-16:2015.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 12625-16:2024 has been approved by CEN as EN ISO 12625-16:2024 without any
modification.
International
Standard
ISO 12625-16
Second edition
Tissue paper and tissue products —
2024-05
Part 16:
Determination of optical properties
— Diffuse reflectance method for
opacity (paper backing)
Papier tissue et produits tissue —
Partie 16: Détermination des propriétés optiques — Méthode par
réflectance diffuse de l'opacité sur fond papier
Reference number
ISO 12625-16:2024(en) © ISO 2024

ISO 12625-16:2024(en)
© ISO 2024
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 12625-16:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 3
5.1 Reflectometer .3
5.2 Reference standards .3
5.3 Working standards .3
5.4 Black cavity . .3
6 Sampling . 3
7 Conditioning . 4
8 Preparation of test pieces . 4
9 Procedure . 4
10 Calculation . 5
11 Test report . 5
Annex A (informative) Spectral characteristics of reflectometers for measuring luminous factor . 6
Annex B (normative) Precision . 10
Bibliography .12

iii
ISO 12625-16:2024(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, Subcommittee SC 2,
Test methods and quality specifications for paper and board, in collaboration with the European Committee
for Standardization (CEN) Technical Committee CEN/TC 172, Pulp, paper and board, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 12625-16:2015), which has been technically
revised.
The main changes are as follows:
— Information has been added to Annex A to explain calculations for instruments with bandpass correction;
Table A.2 provides weighting functions needed for calculations related to instruments with bandpass
correction.
A list of all parts in the ISO 12625 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
ISO 12625-16:2024(en)
Introduction
Optical measurements are affected by the geometry of the instruments used and by the texture of the
material.
The optical properties are related to the visual appearance of the material. Although optical properties are
intrinsic properties of tissue paper, they are not function
...