EN ISO 187:2022

SLOVENSKI STANDARD
01-januar-2023
Nadomešča:
SIST EN 20187:2000
Papir, karton, lepenka in vlaknine - Standardna atmosfera za kondicioniranje in
preskušanje ter postopek za nadzor atmosfere in kondicioniranje vzorcev (ISO
187:2022)
Paper, board and pulps - Standard atmosphere for conditioning and testing and
procedure for monitoring the atmosphere and conditioning of samples (ISO 187:2022)
Papier, Pappe und Zellstoff - Normalklima für die Vorbehandlung und Prüfung und
Verfahren zur Überwachung des Klimas und der Probenvorbehandlung (ISO 187:2022)
Papier, carton et pâtes - Atmosphère normale de conditionnement et d'essai et méthode
de surveillance de l'atmosphère et de conditionnement des échantillons (ISO 187:2022)
Ta slovenski standard je istoveten z: EN ISO 187:2022
ICS:
85.040 Vlaknine Pulps
85.060 Papir, karton in lepenka Paper and board
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 187
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 85.040; 85.060 Supersedes EN 20187:1993
English Version
Paper, board and pulps - Standard atmosphere for
conditioning and testing and procedure for monitoring the
atmosphere and conditioning of samples (ISO 187:2022)
Papier, carton et pâtes - Atmosphère normale de Papier, Pappe und Zellstoff - Normalklima für die
conditionnement et d'essai et méthode de surveillance Vorbehandlung und Prüfung und Verfahren zur
de l'atmosphère et de conditionnement des Überwachung des Klimas und der
échantillons (ISO 187:2022) Probenvorbehandlung (ISO 187:2022)
This European Standard was approved by CEN on 23 September 2022.

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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 187:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 187:2022) 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 May 2023, and conflicting national standards shall be
withdrawn at the latest by May 2023.
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 20187:1993.
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 187:2022 has been approved by CEN as EN ISO 187:2022 without any modification.

INTERNATIONAL ISO
STANDARD 187
Third edition
2022-10
Paper, board and pulps — Standard
atmosphere for conditioning and
testing and procedure for monitoring
the atmosphere and conditioning of
samples
Papier, carton et pâtes — Atmosphère normale de conditionnement
et d'essai et méthode de surveillance de l'atmosphère et de
conditionnement des échantillons
Reference number
ISO 187:2022(E)
ISO 187:2022(E)
© ISO 2022
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 187:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Standard atmosphere . 1
6 Conditioning procedure . 2
6.1 Preconditioning of the sample . 2
6.2 Conditioning. 2
6.3 Testing . 2
7 Test report . 2
Annex A (normative) Measurement of temperature and relative humidity .3
Annex B (informative) Interdependence of temperature and relative humidity .4
Bibliography . 7
iii
ISO 187:2022(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).
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 third edition cancels and replaces the second edition (ISO 187:1990), which has been technically
revised.
The main changes are as follows:
— introduction has been revised;
— normative references have been removed;
— definition of conditioning has been revised;
— content has been added to Clause 5 and Clause 6;
— Annex A has been simplified.
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 187:2022(E)
Introduction
The physical properties of paper are affected by its moisture content which, in turn, is dependent on the
relative humidity (RH) of the surrounding atmosphere and its history. In order that tests can be made
on paper in a defined physical state, it is brought into equilibrium in an atmosphere of standardized
temperature and relative humidity.
The moisture content of a given paper in equilibrium with a given atmosphere varies according to
whether the equilibrium is reached by sorption or by desorption of moisture and how far the moisture
content is from its equilibrium value. This hysteresis influences those physical properties that change
with moisture content. Preconditioning paper from low relative humidity and then bringing it into the
standard atmosphere will avoid most of the hysteresis effect. Typically, the variation in the moisture
content of a given sample is less than 0,15 % when the sample is later conditioned to 50 % RH and 23 °C.
Unless otherwise specified, the equilibrium condition should be attained from a low relative humidity.
For a number of years, three standard test atmospheres have been in common use:
20 °C/65 % RH;
23 °C/50 % RH;
27 °C/65 % RH.
Since 1993, the atmosphere of 23 °C /50 % RH has been considered the ISO standard test atmosphere for
testing of pulp, paper, and board. However, this atmosphere can be difficult to attain in some countries
located in tropical zones, and in such countries the 27 °C /65 % RH atmosphere is permitted.
v
INTERNATIONAL STANDARD ISO 187:2022(E)
Paper, board and pulps — Standard atmosphere for
conditioning and testing and procedure for monitoring the
atmosphere and conditioning of samples
1 Scope
This document specifies the standard atmospheres for conditioning and testing pulp, paper and board,
the conditioning procedure and the procedures for measuring the temperature and relative humidity.
...