SIST EN ISO 12625-15:2015

SLOVENSKI STANDARD
SIST EN ISO 12625-15:2015
01-junij-2015
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Tissue paper and tissue products - Part 15: Determination of optical properties -
Measurement of brightness and colour with C/2° (indoor daylight) illuminant (ISO 12625-
15:2015)
Tissue-Papier und Tissue-Produkte - Teil 15: Bestimmung von optischen Eigenschaften -
Messung von Brightness und Farbe unter Lichtart C/2° (Tageslichtbedingungen in
Innenräumen) (ISO 12625-15:2015)
Papier tissue et produits tissues - Partie 15: Détermination des propriétés optiques -
Mesurage du degré de blancheur et de la coleur avec l'illuminant C/2° lumière du jour à
l'intérieur) (ISO 12625-15:2015)
Ta slovenski standard je istoveten z: EN ISO 12625-15:2015
ICS:
85.080.20 Tissue papir Tissue paper
SIST EN ISO 12625-15:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 12625-15:2015

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SIST EN ISO 12625-15:2015

EUROPEAN STANDARD
EN ISO 12625-15

NORME EUROPÉENNE

EUROPÄISCHE NORM
February 2015
ICS 85.060
English Version
Tissue paper and tissue products - Part 15: Determination of
optical properties - Measurement of brightness and colour with
C/2° (indoor daylight) illuminant (ISO 12625-15:2015)
Papier tissue et produits tissue - Partie 15: Détermination Tissue-Papier und Tissue-Produkte - Teil 15: Bestimmung
des propriétés optiques - Mesurage du degré de blancheur von optischen Eigenschaften - Messung von Brightness und
et de la couleur avec l'illuminant C/2° (lumière du jour à Farbe unter Lichtart C/2° (Tageslichtbedingungen in
l'intérieur) (ISO 12625-15:2015) Innenräumen) (ISO 12625-15:2015)
This European Standard was approved by CEN on 3 January 2015.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12625-15:2015 E
worldwide for CEN national Members.

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SIST EN ISO 12625-15:2015
EN ISO 12625-15:2015 (E)
Contents Page
Foreword .3

2

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SIST EN ISO 12625-15:2015
EN ISO 12625-15:2015 (E)
Foreword
This document (EN ISO 12625-15:2015) 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 August 2015, and conflicting national standards shall be withdrawn at
the latest by August 2015.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 12625-15:2015 has been approved by CEN as EN ISO 12625-15:2015 without any
modification.
3

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SIST EN ISO 12625-15:2015

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SIST EN ISO 12625-15:2015
INTERNATIONAL ISO
STANDARD 12625-15
First edition
2015-02-15
Tissue paper and tissue products —
Part 15:
Determination of optical properties —
Measurement of brightness and colour
with C/2° (indoor daylight) illuminant
Papier tissue et produits tissue —
Partie 15: Détermination des propriétés optiques — Mesurage du
degré de blancheur et de la couleur avec l’illuminant C/2° (lumière du
jour à l’intérieur)
Reference number
ISO 12625-15:2015(E)
©
ISO 2015

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SIST EN ISO 12625-15:2015
ISO 12625-15:2015(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2015
All rights reserved. Unless otherwise specified, 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
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
ii © ISO 2015 – All rights reserved

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SIST EN ISO 12625-15:2015
ISO 12625-15:2015(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Apparatus . 3
5.1 Reflectometer or spectrophotometer . 3
5.2 Reference standard for calibration of the instrument . 3
5.3 Working standards . 3
6 Calibration . 4
7 Sampling . 4
8 Conditioning . 4
9 Preparation of test pieces . 5
10 Procedure. 5
10.1 General . 5
10.2 Measurement of C/2° brightness . 5
10.3 Measurement of (C/2°) colour . 5
11 Calculation . 6
11.1 C/2° brightness . 6
11.2 C/2° Colour. 6
11.2.1 Single values . 6
11.2.2 Mean value . 6
11.2.3 Dispersion of the results . 7
12 Test report . 7
Annex A (informative) Precision . 8
Bibliography .11
© ISO 2015 – All rights reserved iii

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SIST EN ISO 12625-15:2015
ISO 12625-15:2015(E)

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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
ISO 12625-15 was prepared by European Committee for Standardization (CEN) Technical Committee
CEN/TC 172 Pulp, paper and board, in collaboration with Technical Committee ISO/TC 6, Paper, board
and pulps, Subcommittee SC 2, Test methods for quality specifications for paper and board, in accordance
with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
ISO 12625 consists of the following parts, under the general title Tissue paper and tissue products:
— Part 1: General guidance on terms
— Part 3: Determination of thickness, bulking thickness, apparent bulk density and bulk
— Part 4: Determination of tensile strength, stretch at break and tensile energy absorption
— Part 5: Determination of wet tensile strength
— Part 6: Determination of grammage
— Part 7: Determination of optical properties — Measurement of brightness and colour with D65/10°
(outdoor daylight)
— Part 8: Water-absorption time and water-absorption capacity, basket-immersion test method
— Part 9: Determination of ball burst strength
— Part 11: Determination of wet ball burst strength
— Part 12: Determination of tensile strength of perforated lines — Calculation of perforation efficiency
— Part 15: Determination of optical properties — Measurement of brightness and colour with C/2°
(indoor daylight)
— Part 16: Determination of optical properties — Opacity (paper backing) — Diffuse reflectance method
iv © ISO 2015 – All rights reserved

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SIST EN ISO 12625-15:2015
ISO 12625-15:2015(E)

Introduction
Brightness and colour measurement may be performed under various illumination and observation
conditions. This part of ISO 12625 deals with C/2° conditions, which refer to an indoor daylight.
D65/10° conditions (outdoor daylight) are considered in ISO 12625-7. Although both standards deal
with brightness and colour, results obtained are usually different and do not correlate.
Optical measurements are affected by the geometry of the instruments used and by the texture of the
material. The design of the instrument to be used according to this part of ISO 12625, and the routine to
be adopted for its calibration are specified in ISO 2469 and ISO 2470-1.
The optical properties are related to the visual appearance of the material in a specified illumination condition.
Although optical properties are intrinsic properties of tissue paper, they are not functional properties.
Brightness is not to be confused with the optical property called CIE-whiteness, which is based on
reflectance data obtained over the full visible spectral range (VIS). In contrast, brightness is limited to
the blue region of VIS (visible spectrum).
As preferences for the properties to be specified can vary by country/market, three different test
methods for the determination of optical properties were developed:
— Part 7: Determination of optical properties — Measurement of brightness and colour with D65/10°
(outdoor daylight);
— Part 15: Determination of optical properties — Measurement of brightness and colour with C/2°
(indoor daylight);
— Part 16: Determination of optical properties — Measurement of opacity (paper backing) — Diffuse
reflectance method.
© ISO 2015 – All rights reserved v

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SIST EN ISO 12625-15:2015

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SIST EN ISO 12625-15:2015
INTERNATIONAL STANDARD ISO 12625-15:2015(E)
Tissue paper and tissue products —
Part 15:
Determination of optical properties — Measurement of
brightness and colour with C/2° (indoor daylight) illuminant
1 Scope
This part of ISO 12625 specifies testing procedures for the instrumental determination of brightness
and colour of tissue paper and tissue products viewed in indoor daylight conditions. It also gives
specific instructions for the preparation of test pieces (single-ply, multi-ply products) and for the optical
measurements of products, where special precautions may be necessary.
NOTE The properties called D65 brightness and colour are measured with an instrument adjusted to a much
higher UV content than that specified in this part of ISO 12625. The measurements of D65 brightness and colour
are described in ISO 12625-7.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 186, Paper and board — Sampling to determine average quality
ISO 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples
ISO 2469, Paper, board and pulps — Measurement of diffuse radiance factor
ISO 2470-1:2009, Paper, board and pulps — Measurement of diffuse blue reflectance factor — Part 1: Indoor
daylight conditions (ISO brightness)
ISO 5631-1:2009, Paper and board — Determination of colour by diffuse reflectance — Part 1: Indoor
daylight conditions (C/2°)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
reflectance factor
R
ratio of the radiation reflected by a body to that reflected by the perfect diffuser under the same
conditions of illumination and detection
Note 1 to entry: The reflectance factor is expressed as a percentage.
Note 2 to entry: The reflectance factor is influenced by the backing if the body is translucent.
© ISO 2015 – All rights reserved 1

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SIST EN ISO 12625-15:2015
ISO 12625-15:2015(E)

3.2
diffuse reflectance radiance factor
R
ratio of the reflection from a body to that from the perfect reflecting diffuser under the same conditions
of diffuse illumination and normal detection
Note 1 to entry: The ratio is often expressed as a percentage.
[SOURCE: ISO 2469:2007]
3.3
intrinsic reflectance factor
R
∞
diff
...