EN ISO 535:2014

SLOVENSKI STANDARD
01-maj-2014
1DGRPHãþD
SIST EN 20535:2000
3DSLUNDUWRQLQOHSHQND'RORþHYDQMHDEVRUSFLMHYRGH&REERYDPHWRGD,62

Paper and board - Determination of water absorptiveness - Cobb method (ISO 535:2014)
Papier und Pappe - Bestimmung des Wasserabsorptionsvermögens - Cobb-Verfahren
(ISO 535:2014)
Papier et carton - Détermination de l'absorption d'eau - Méthode de Cobb (ISO
535:2014)
Ta slovenski standard je istoveten z: EN ISO 535:2014
ICS:
85.060 Papir, karton in lepenka Paper and board
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 535
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2014
ICS 85.060 Supersedes EN 20535:1994
English Version
Paper and board - Determination of water absorptiveness - Cobb
method (ISO 535:2014)
Papier et carton - Détermination de l'absorption d'eau - Papier und Pappe - Bestimmung des
Méthode de Cobb (ISO 535:2014) Wasserabsorptionsvermögens - Cobb-Verfahren (ISO
535:2014)
This European Standard was approved by CEN on 23 December 2013.

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
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 535:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
This document (EN ISO 535:2014) 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 2014, and conflicting national standards shall be withdrawn at
the latest by August 2014.
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.
This document supersedes EN 20535:1994.
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 535:2014 has been approved by CEN as EN ISO 535:2014 without any modification.

INTERNATIONAL ISO
STANDARD 535
Third edition
2014-02-01
Paper and board — Determination of
water absorptiveness — Cobb method
Papier et carton — Détermination de l’absorption d’eau — Méthode
de Cobb
Reference number
ISO 535:2014(E)
©
ISO 2014
ISO 535:2014(E)
© ISO 2014
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
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the requester.
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Published in Switzerland
ii © ISO 2014 – All rights reserved

ISO 535:2014(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents and materials . 1
6 Apparatus . 2
7 Sampling . 2
8 Conditioning . 2
9 Preparation of test pieces . 2
10 Procedure. 3
10.1 Mounting of the test piece . 3
10.2 Exposure to water and blotting . 3
10.3 Times of test . 3
10.4 Rejection of test pieces . 4
11 Expression of results . 4
12 Test report . 5
Annex A (informative) Precision . 6
Bibliography . 8
ISO 535:2014(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 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
The committee responsible for this document is ISO/TC 6, Paper, board and pulps, Subcommittee SC 2,
Test methods and quality specifications for paper and board.
This third edition cancels and replaces the second edition (ISO 535:1991), which has been technically
revised to include precision data.
iv © ISO 2014 – All rights reserved

ISO 535:2014(E)
Introduction
The test described in this International Standard permits the determination of the quantity of water
that can be absorbed by the surface of paper or board in a given time. Water absorptiveness is a function
of various paper and board characteristics such as sizing, porosity, etc.
INTERNATIONAL STANDARD ISO 535:2014(E)
Paper and board — Determination of water absorptiveness
— Cobb method
1 Scope
This International Standard specifies a method of determining the water absorptiveness of sized paper
and board, including corrugated fibreboard, under standard conditions. It may not be suitable for paper
of grammage less than 50 g/m or embossed paper. It is not suitable for porous papers such as newsprint
or unsized papers such as blotting paper or other papers having a relatively high water absorptiveness
[2]
for which ISO 8787 is more suitable.
This method is not intended to be used for precise evaluation of the writing properties of paper although
it does give a general indication of suitability for use with aqueous inks.
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 5269-1, Pulps — Preparation of laboratory sheets for physical testing — Part 1: Conventional sheet-
former method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
water absorptiveness (Cobb value)
calculated mass of water absorbed in a specified time by 1 m of paper or board under specified
conditions
Note 1 to entry: The test area is normally 100 cm .
4 Principle
A test piece is weighed immediately before and immediately after exposure for a specified time of one
surface to water, followed by blotting. The result of the increase in mass is expressed in grams per
square metre (g/m ).
5 Reagents an
...