EN ISO 7783-1:1999

Paints and varnishes - Determination of water-vapour transmission rate - Part 1: Dish method for free films (ISO 7783-1:1996, including Technical Corrigendum 1:1998)

This international standard specifies a method for the determination of the water vapour transmission rate of an unsupported film of paint, varnish or related product. The test method is applicable to the transmission of water vapour in either direction through a paint film.

Beschichtungsstoffe - Bestimmung der Wasserdampf-Diffusionsstromdichte - Teil 1: Schalenverfahren für freie Filme (ISO 7783-1:1996, einschließlich Technische Korrektur 1:1998)

Dieser Teil von ISO 7783 legt ein Verfahren zum Bestimmen der Wasserdampf-Diffusionsstromdichte 2) eines freien Films aus einem Beschichtungsstoff fest. Das Prüfverfahren ist für den Durchgang von Wasserdampf durch eine Beschichtung in beiden Richtungen anwendbar.

Peintures et vernis - Détermination du coefficient de transmission de la vapeur d'eau - Partie 1: Méthode de la capsule pour feuils libres (ISO 7783-1:1996, Rectificatif Technique 1:1998 inclus)

La présente partie de l'ISO 7783 prescrit une méthode pour la détermination du coefficient de transmission de la vapeur d'eaupuissance 2

Barve in laki - Določevanje prepustnosti za vodno paro - 1. del: Metoda z merilno posodico za suhe premazne sloje brez nosilne podlage (ISO 7783-1:1996, vključno s tehničnim popravkom 1:1998)

General Information

• Status: Withdrawn
• Publication Date: 20-Apr-1999
• Withdrawal Date: 31-Oct-2011
• ICS: 87.040 - Paints and varnishes
• Technical Committee: CEN/TC 139 - Paints and varnishes
• Drafting Committee: CEN/TC 139 - Paints and varnishes
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 01-Nov-2011
• Completion Date: 01-Nov-2011
• Ref Project: SIST EN ISO 7783-1:1999 - Paints and varnishes - Determination of water-vapour transmission rate - Part 1: Dish method for free films (ISO 7783-1:1996, including Technical Corrigendum 1:1998)

Relations

• Replaced By: EN ISO 7783:2011 - Paints and varnishes - Determination of water-vapour transmission properties - Cup method (ISO 7783:2011)
• Effective Date: 12-Nov-2011

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-1999
%DUYHLQODNL'RORþHYDQMHSUHSXVWQRVWL]DYRGQRSDURGHO0HWRGD]PHULOQR
SRVRGLFR]DVXKHSUHPD]QHVORMHEUH]QRVLOQHSRGODJH,62YNOMXþQR
VWHKQLþQLPSRSUDYNRP
Paints and varnishes - Determination of water-vapour transmission rate - Part 1: Dish
method for free films (ISO 7783-1:1996, including Technical Corrigendum 1:1998)
Beschichtungsstoffe - Bestimmung der Wasserdampf-Diffusionsstromdichte - Teil 1:
Schalenverfahren für freie Filme (ISO 7783-1:1996, einschließlich Technische Korrektur
1:1998)
Peintures et vernis - Détermination du coefficient de transmission de la vapeur d'eau -
Partie 1: Méthode de la capsule pour feuils libres (ISO 7783-1:1996, Rectificatif
Technique 1:1998 inclus)
Ta slovenski standard je istoveten z: EN ISO 7783-1:1999
ICS:
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL
ISO
STANDARD
7783-1
First edition
1996-06-15
Paints and varnishes - Determination of
water-vapour transmission rate -
Part 1:
Dish method for free films
Pein tures et vernis - Dktermina tion du coefficien t de transmission de
Ia vapeur d ’eau -
Partiel: Methode de Ia capsule pour feuils libres
Reference number
ISO 7783-1:1996( E)
ISO 77834:1996(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide fed-
eration of national Standards bodies (ISO member bodies). The work of
preparing International Standards is normally carried out through ISO
technical committees. Esch member body interested in a subject for
which a technical committee has been established has the right to be rep-
resented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO col-
laborates closely with the International Electrotechnical Commission (IEC)
on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are cir-
culated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 7783-1 was prepared by Technical Committee
ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test meth-
ods for paints and varnishes.
L ’ISO 7783 consists of the following Parts, under the general title Paints
and varnishes - De termina tjon of wa ter-vapour transmission rate:
- Part 7: Dish me thod for free films
- Part 2: Method for films supported by a porous Substrate
Annexes A to D form an integral part of this part of ISO 7783.
0 ISO 1996
All rights reserved. Unless otherwise specified, no part of this publication may be repro-
duced or utilized in any form or by any means, electronie or mechanrcal, includrng photo-
copying and mrcrofilm, without Permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-l 21 IG eneve 20 l Switzerland
Printed in Switzerland
@ ISO ISO 778301:1996(E)
Introduction
This part of ISO 7783 is one sf a series of Standards dealing with the
sampling and testing of paints, varnishes and related products. lt describes
a method for determining the water-vapour transmission rate of an unsup-
ported paint film. ISO 7783-21) describes a method for determining the
water-vapour transmission rate of a paint film supported by a porous sub-
strate.
Water-vapour transmission rate is most commonly of interest when the
coating is applied to a porous Substrate. Depending on the conditions of
use, water vapour may be expected to pass in either direction through the
coating.
The procedure is commonly used to compare the transmission rates of
two or more different paint films and not to obtain absolute results. In the
latter case, it may be preferable to carry out the determination on a coated
test piece of the appropriate permeable Substrate. The procedure for carry-
ing out that determination forms the subject of ISO 7783-2.
1) To be published.
This page intentionally left blank

ISO 7783=1:1996(E)
INTERNATIONAL STANDARD o ISO
Paints and varnishes - Determination of water-vapour
transmission rate
Part 1:
Dish method for free films
ISO 1513:1992, Paints and varnishes - Examination
1 Scope
and preparation of samples for testing.
This part of ISO 7783 specifies a method for the de-
ISO 2528:1995, Sheet materials - Determination of
termination of the water-vapour transmission rate21 of
water vapour transmission rate - Gravimetric (dish)
an unsupported film of paint, varnish or related prod-
method.
uct. The test method is applicable to the transmission
of water vapour in either direction through a paint film.
ISO 2808:-31, Paints and varnishes - Determination
of film thickness.
ISO 3270:1984, Paints and varnishes and their raw
2 Normative references
ma terials - Temperatures and humidities for condi-
tioning and tes ting.
The following Standards contain provisions which,
through reference in this text, constitute provisions of
ISO 3696: 1987, Water for analytical laboratory use -
this part of ISO 7783. At the time of publication, the
Specifica tion and tes t me thods.
editions indicated were valid. All Standards are subject
to revision, and Parties to agreements based on this
part of ISO 7783 are encouraged to investigate the
possibility of applying the most recent editions of the
3 Definition
Standards indicated below. Members of IEC and ISO
maintain registers of currently valid International Stan-
For the purposes of this part of ISO 7783, the follow-
dards.
ing definition applies.
ISO 209-1: 1989, Wrought aluminium and aluminium
alloys - Chemical composition and forms of prod- 3.1 water-vapour transmission rate (of a coating):
ucts - Part 1: Chemical composition. The mass of water vapour that is transmitted over a
given period through a test piece of a given surface
ISO 483:1988, Plastics - Small enclosures for con-
area under specified constant conditions of relative
ditioning and testing using aqueous solutions to main-
humidity at each face of the test piece.
tain relative humidity at cons tan t value.
NOTE 1 Water-vapour transmission rate is expressed in
grams per Square metre per day [g/(mz.d)] at the conditions
ISO 1512:1991, Paints and varnishes - Sampling of
of relative humidity defined at the two faces of the coating.
products in liquid or Paste form.
2) This term is often confused with permeability or permeance, which have distinct definitions (see note 9 in subclause 11.3).
3) To be published. (Revision of ISO 2808:1991)

ISO 7783=1:1996(E) 0 ISO
4 Principle The exact surface area of the test piece exposed is
defined by the design of the dish. The diameter of the
exposed surface shall be not greater than 113 mm
4.1 Dishes containing a saturated Solution of am-
(area = 100 cm*) and not less than 35,7 mm
monium dihydrogen Phosphate, producing an atmos-
10 cm*). The area shall be known to within
(area =
phere immediately above it of 93 % relative humidity,
1 %.
and closed by a film of the product to be tested are
placed in an enclosure at a controlled temperature.
The dish shall be so designed that an efficient seal
The relative humidity on the outside of the product
may be made between it and the test piece. The most
film is varied according to the requirements. The
usual arrangement is for the dish to be fitted with an
dishes are weighed at suitable intervals of time and
annular cap with a mechanical clamping or screw de-
the water-vapour transmission rate is determined
vice which may incorporate a sealing ring of a suitable
from the Change in mass when the Change has be-
impervious polymeric material. Alternatively, molten
come directly proportional to the time interval.
wax may be used as a sealant, a suitable procedure
being described in annex D.
4.2 In the referee method, the temperature of the
enclosure is maintained at (23 & 2) OC and its relative
NOTE 3 A mechanical sealing device is generally easier to
humidity at (50 & 5) % (see annex B).
use. It may not be suitable if the test piece has a rough sur-
face or if it is very fragile. In those cases, the use of molten
wax is more satisfactory, but it is necessary to ensure that
4.3 Alternative conditions, including placing a desic-
the wax is accurately contained. Spread of the molten wax
cant in the dish, which is then placed in the enclosure,
on to the measured test area will reduce the effective area
are permitted by agreement (see annex C).
of the test piece and lead to erroneous results.
The surface area of the bottom of the dish where it is
filled with the saturated Solution (7.2) shall be similar
5 Significance of the test
to that of the exposed surface and there shall be no
obstruction within the dish which might interfere with
The test is intended to give consistent values of the movement of water vapour. The internal depth of
water-vapour transmission rate by means of simple the dish below the plane of the test piece shall not be
less than 15 mm.
apparatus, but the use of the results for any particular
application will be based upon experience.
Esch dish shall be clearly identified and shall be pro-
vided with a lid to close the dish assembly sufficiently
Because the water-vapour transmission rate is not
well to allow it to be brought out from the enclosure
necessarily a linear function of film thickness, tem-
for weighing without loss of water vapour (see note 8
perature or relative-humidity differente, a determi-
in 10.1). The lids shall be identified to correspond with
nation carried out under one set of conditions may not
each dish.
necessarily be comparable with one carried out under
other conditions. Therefore, it is essential that the
7.2 Saturated solution of ammonium dihydrogen
conditions of test are Chosen so as to be as close as
Phosphate (analytical grade), prepared using water of
possible to the conditions of use.
at least grade 3 purity as defined in ISO 3696, to pro-
duce 93 % relative humidity.
7.3 Enclosure, in which both temperature and rela-
6 Required supplementary information
tive humidity tan be controlled at the levels required
for the test (see annex B).
For any particular application, the test method speci-
fied in this part of ISO 7783 needs to be completed by
The control shall be such that, when dishes have to be
supplementary information. The items of supplemen-
removed for weighing, the specified conditions are re-
tary information are given in annex A.
established not more than 15 min after the door of the
enclosure has been closed. The door shall be open for
the shortest possible time: this is specially important
with materials having high transmission rates.
7 Apparatus and equipment
NOTES
4 If a suitable controllable enclosure is not available, it may
7.1 Dishes, preferably made of glass or a light metal
be possible to achieve the specified conditions by means of
(see note 2) that is resistant to corrosion under the
equilibrium with selected aqueous solutions. Guidance on
test conditions. They shall be sufficiently rigid to with-
this procedure is given in ISO 483.
stand handling without undue distortion.
5 lt may be possible to achieve the specified conditions by
enclosing the dishes in a suitable closed vessel containing a
NOTE 2 Aluminium of grade Al 99,5 in accordance with
desiccant or the selected aqueous Solution and placing that
ISO 209-1, protected by Chemical or anodic Oxidation, is
vessel in a suitable temperature-controlled chamber or
suitable, and sheet aluminium of thickness 1 mm has been
room.
found to be satisfactory.
0 ISO
ISO 7783=1:1996(E)
7.4 Balance, capable of weighing to 0,l mg for Fill each dish with the saturated Solution (7.2) to ap-
dishes of area 50 cm* or less, or weighing to 1 mg for
proximately 10 mm below the final Position of the test
dishes with areas greater than 50 cm?
piece. Fit the test piece to the dish, with the appropri-
ate face exposed to the ambient atmosphere, as
7.5 Cutting template, suitable for the dish (see specified, and make a vapour-tight seal (see 7.1) be-
figure 0.1). This template may have a handle in the tween the test piece and the dish.
centre.
NOTE 8 If the dish assemblies are removed from the en-
closure for weighing, it may be necessary to cover the
asembly with a lid marked to correspond with the identifi-
8 Sampling
cation of the assembly.
Take a representative Sample of the product to be
10.2 Determination
tested (or of each product in the case of a multi-coat
System), as specified in ISO 1512.
10.21 Weigh the dish assemblies on the balance
(7.4). Place the dish assemblies in the enclosure main-
Examine and prepare each Sample for testing, as
specified in ISO 1513. tained at the conditions of the test (see 7.3 and an-
nex B).
10.2.2 Carry out successive weighings of the dish
9 Preparation of test pieces
assemblies at suitable intervals of time using the fol-
lowing procedure:
NOTE 6 The test pieces consist of a film of the material or
System under test, unsupported by any Substrate.
Remove the dish assemblies from the controlled en-
closure. Leave them to resch ambient temperature.
9.1 Choose a suitable Substrate [see annex A, item
Weigh the assemblies on the balance (7.4) and return
a)]. High-density polyethylene which is free from sur-
the assemblies to the enclosure.
face defects and from which the product under test
tan be easily detached when dry has been found to
Carry out the weighing without delay, taking the dish
be suitable.
assemblies in small groups of about the same num-
ber. Remove, weigh and replace each group of as-
NOTE 7 Other Substrate arrangements may be u
...