EN ISO 7783:2011

SLOVENSKI STANDARD
01-januar-2012
1DGRPHãþD
SIST EN ISO 7783-1:1999
SIST EN ISO 7783-2:1999
%DUYHLQODNL8JRWDYOMDQMHSUHSXVWQRVWLYRGQHSDUH0HWRGDVþDãR,62

Paints and varnishes - Determination of water-vapour transmission properties - Cup
method (ISO 7783:2011)
Beschichtungsstoffe - Bestimmung der Wasserdampfdurchlässigkeit - Schalenverfahren
(ISO 7783:2011)
Peintures et vernis - Détermination du coefficient de transmission de la vapeur d'eau -
Méthode au cylindre (ISO 7783:2011)
Ta slovenski standard je istoveten z: EN ISO 7783:2011
ICS:
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 7783
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2011
ICS 87.040 Supersedes EN ISO 7783-1:1999, EN ISO 7783-2:1999
English Version
Paints and varnishes - Determination of water-vapour
transmission properties - Cup method (ISO 7783:2011)
Peintures et vernis - Détermination des propriétés de Beschichtungsstoffe - Bestimmung der
transmission de la vapeur d'eau - Méthode de la coupelle Wasserdampfdurchlässigkeit - Schalenverfahren (ISO
(ISO 7783:2011) 7783:2011)
This European Standard was approved by CEN on 21 November 2011.

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7783:2011: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 7783:2011) has been prepared by Technical Committee ISO/TC 35 "Paints and
varnishes" in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” 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 2012, and conflicting national standards shall be withdrawn at the
latest by May 2012.
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 ISO 7783-1:1999, EN ISO 7783-2:1999.
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, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 7783:2011 has been approved by CEN as a EN ISO 7783:2011 without any modification.

INTERNATIONAL ISO
STANDARD 7783
First edition
2011-11-01
Paints and varnishes — Determination of
water-vapour transmission properties —
Cup method
Peintures et vernis — Détermination des propriétés de transmission de
la vapeur d’eau — Méthode de la coupelle
Reference number
ISO 7783:2011(E)
©
ISO 2011
ISO 7783:2011(E)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing 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 2011 – All rights reserved

ISO 7783:2011(E)
Contents Page
Foreword .iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Apparatus and materials . 3
5.1 Substrate for non-self-supporting coatings . 3
5.2 Test cup . 3
5.3 Ammonium dihydrogen phosphate (NH H PO ) solution for wet-cup method . 3
4 2 4
5.4 Desiccant for dry-cup method . 3
5.5 Sealing material . 4
5.6 Test enclosure . 4
5.7 Balance . 4
6 Preparation for the test . 4
6.1 Sampling of coating material . 4
6.2 Preparation of test pieces . 4
6.3 Determination of the thickness of the coating . 5
6.4 Preparation of the test assemblies . 6
7 Procedure . 6
8 Expression of results . 7
8.1 Water-vapour transmission rate, �, of self-supporting coatings . 7
8.2 Water-vapour transmission rate, �, of non-self-supporting coatings . 7
8.3 Water-vapour diffusion-equivalent air layer thickness, � . 9
d
8.4 Water-vapour resistance factor, � . 9
9 Precision .10
9.1 Repeatability, (� .) .10
9.2 Reproducibility, (� ).10
10 Test report .10
Annex A (informative) Derivation of Equation (8) in Subclause 8.3 for the calculation of the water-
vapour diffusion-equivalent air layer thickness, � .12
d
Annex B (normative) Use of molten wax for sealing the test assembly .14
Bibliography .18
ISO 7783:2011(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 7783 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9,
General test methods for paints and varnishes.
This first edition of ISO 7783 cancels and replaces ISO 7783-1:1996 and ISO 7783-2:1999, which have been
merged and technically revised. It also incorporates the Technical Corrigendum ISO 7783-1:1996/Cor.1:1998.
iv © ISO 2011 – All rights reserved

ISO 7783:2011(E)
Introduction
ISO 7783 is one of a series of standards dealing with the sampling and testing of paints, varnishes and related
products. It describes a method for determining the water-vapour transmission rate of self-supporting and non-
self-supporting coatings.
The water-vapour transmission rate is not necessarily a linear function of film thickness, temperature or relative-
humidity difference. A determination carried out under one set of conditions will not necessarily be comparable
with one carried out under other conditions. Therefore, it is essential that the conditions of test are chosen to
be as close as possible to the conditions of use.
Water-vapour transmission is of greatest interest under conditions of high humidity. For this reason, the wet-
cup method has been adopted as the reference method. By agreement, other procedures and conditions, like
the dry-cup method, may be used.
INTERNATIONAL STANDARD ISO 7783:2011(E)
Paints and varnishes — Determination of water-vapour
transmission properties — Cup method
1 Scope
This International Standard specifies a method for determining the water-vapour transmission properties of
coatings of paints, varnishes and related products.
It supplements ISO 12572. As far as possible, the procedure, the definitions and the calculations have been
taken over from ISO 12572. It is recommended that ISO 12572 be consulted, if necessary, to obtain a better
understanding of the procedure specified in this International Standard.
Water-vapour transmission rates of more than 680 g/(m�d) (i.e. water-vapour diffusion-equivalent air layer
thicknesses, �, of less than 0,03 m) will not be accurately quantified by the test method described in this
d
International Standard.
2 Normative references
The following referenced documents are indi
...