Hygrothermal performance of building materials and products - Determination of water vapour transmission properties - Cup method (ISO 12572:2016)

ISO 12572:2016 specifies a method based on cup tests for determining the water vapour permeance of building products and the water vapour permeability of building materials under isothermal conditions. Different sets of test conditions are specified.
The general principles are applicable to all hygroscopic and non-hygroscopic building materials and products, including insulation materials and including those with facings and integral skins. Annexes give details of test methods suitable for different material types.
The results obtained by this method are suitable for design purposes, production control and for inclusion in product specifications.

Wärme- und feuchtetechnisches Verhalten von Baustoffen und Bauprodukten - Bestimmung der Wasserdampfdurchlässigkeit - Verfahren mit einem Prüfgefäß (ISO 12572:2016)

Diese Internationale Norm legt ein Verfahren zur Bestimmung des Wasserdampf-diffusions Durchlasskoeffizienten von Bauprodukten und des Wasserdampfdiffusionsleitkoeffizienten von Baustoffen unter isothermischen Bedingungen fest, das auf Prüfungen mit Prüfgefäßen basiert. Verschiedene Prüfbedingungen werden festgelegt.
Die allgemeinen Prinzipien gelten für alle hygroskopischen und nicht hygroskopischen Baustoffe und  produkte einschließlich Wärmedämmstoffen und Baustoffen mit Beschichtungen oder Häuten. Einzelheiten zu Prüfverfahren, die für einzelne Stoffarten geeignet sind, sind in den Anhängen angegeben.
Die Ergebnisse, die nach diesem Verfahren erhalten werden, sind geeignet für die Bemessung, zur Produktionskontrolle und zur Aufnahme in Produktspezifikationen.

Performance hygrothermique des matériaux et produits pour le bâtiment - Détermination des propriétés de transmission de la vapeur d'eau - Méthode de la coupelle (ISO 12572:2016)

ISO 12572:2016 spécifie une méthode basée sur des essais en coupelle pour déterminer la perméance à la vapeur d'eau des produits pour le bâtiment ainsi que la perméabilité à la vapeur d'eau des matériaux pour le bâtiment dans des conditions isothermes. Différentes séries de conditions d'essai sont spécifiées.
Les principes généraux sont applicables à tous les matériaux et produits de bâtiment hygroscopiques et non hygroscopiques, y compris les matériaux isolants et ceux qui possèdent des parements et des revêtements intégrés. Les annexes fournissent des détails sur des méthodes d'essai convenant pour différents types de matériaux.
Les résultats obtenus par cette méthode peuvent être utilisés pour la conception, pour le contrôle de la production et pour insertion dans les spécifications de produits.

Higrotermalno obnašanje gradbenih materialov in proizvodov - Ugotavljanje lastnosti za prehod vodne pare - Metoda s čašami (ISO 12572:2016)

Ta dokument določa metodo, ki temelji na preskušanju v posodi za določanje prepustnosti vodne pare gradbenih proizvodov in prepustnosti vodne pare gradbenih materialov pri izotermnih pogojih.
Navedeni so različni sklopi preskusnih pogojev.
Splošna načela veljajo za vse higroskopske in nehigroskopske gradbene materiale in proizvode, vključno z izolacijskimi materiali in tistimi z dodanimi sloji ter vgrajenimi plašči. Dodatki podajajo podrobnosti preskusnih metod, ki so primerne za različne vrste materialov.
Rezultati, pridobljeni s to metodo, so primerni za potrebe projektiranja, kontrolo proizvodnje in vključitev v specifikacije izdelkov.

General Information

Status
Published
Publication Date
23-Aug-2016
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
24-Aug-2016
Completion Date
24-Aug-2016

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SLOVENSKI STANDARD
SIST EN ISO 12572:2016
01-november-2016
1DGRPHãþD
SIST EN ISO 12572:2002
+LJURWHUPDOQRREQDãDQMHJUDGEHQLKPDWHULDORYLQSURL]YRGRY8JRWDYOMDQMH
ODVWQRVWL]DSUHKRGYRGQHSDUH0HWRGDVþDãDPL ,62

Hygrothermal performance of building materials and products - Determination of water

vapour transmission properties - Cup method (ISO 12572:2016)
Wärme- und feuchtetechnisches Verhalten von Baustoffen und Bauprodukten -
Bestimmung der Wasserdampfdurchlässigkeit - Verfahren mit einem Prüfgefäß (ISO
12572:2016)

Performance hygrothermique des matériaux et produits pour le bâtiment - Détermination

des propriétés de transmission de la vapeur d'eau - Méthode de la coupelle (ISO
12572:2016)
Ta slovenski standard je istoveten z: EN ISO 12572:2016
ICS:
91.100.01 Gradbeni materiali na Construction materials in
splošno general
91.120.30 =DãþLWDSUHGYODJR Waterproofing
SIST EN ISO 12572:2016 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 12572:2016
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SIST EN ISO 12572:2016
EN ISO 12572
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2016
EUROPÄISCHE NORM
ICS 91.120.10 Supersedes EN ISO 12572:2001
English Version
Hygrothermal performance of building materials and
products - Determination of water vapour transmission
properties - Cup method (ISO 12572:2016)

Performance hygrothermique des matériaux et Wärme- und feuchtetechnisches Verhalten von

produits pour le bâtiment - Détermination des Baustoffen und Bauprodukten - Bestimmung der

propriétés de transmission de la vapeur d'eau - Wasserdampfdurchlässigkeit - Verfahren mit einem

Méthode de la coupelle (ISO 12572:2016) Prüfgefäß (ISO 12572:2016)
This European Standard was approved by CEN on 16 July 2016.

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

© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12572:2016 E

worldwide for CEN national Members.
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SIST EN ISO 12572:2016
EN ISO 12572:2016 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 12572:2016
EN ISO 12572:2016 (E)
European foreword

This document (EN ISO 12572:2016) has been prepared by Technical Committee CEN/TC 89 “Thermal

performance of buildings and building components” the secretariat of which is held by SIS, in

collaboration with Technical Committee ISO/TC 163 “Thermal performance and energy use in the built

environment”.

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 February 2017, and conflicting national standards

shall be withdrawn at the latest by February 2017.

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 12572:2001.

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 12572:2016 has been approved by CEN as EN ISO 12572:2016 without any modification.

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SIST EN ISO 12572:2016
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SIST EN ISO 12572:2016
INTERNATIONAL ISO
STANDARD 12572
Second edition
2016-08-01
Hygrothermal performance of
building materials and products —
Determination of water vapour
transmission properties — Cup method
Performance hygrothermique des matériaux et produits pour le
bâtiment — Détermination des propriétés de transmission de la
vapeur d’eau — Méthode de la coupelle
Reference number
ISO 12572:2016(E)
ISO 2016
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SIST EN ISO 12572:2016
ISO 12572:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland

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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
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SIST EN ISO 12572:2016
ISO 12572:2016(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms, definitions, symbols, units and subscripts ............................................................................................................ 1

3.1 Terms and definitions ....................................................................................................................................................................... 1

3.2 Symbols and units ................................................................................................................................................................................ 2

3.3 Subscripts .................................................................................................................................................................................................... 3

4 Principle ........................................................................................................................................................................................................................ 3

5 Apparatus ..................................................................................................................................................................................................................... 3

6 Test specimens........................................................................................................................................................................................................ 4

6.1 General principles for preparation of test specimens ........................................................................................... 4

6.2 Dimensions of test specimens ................................................................................................................................................... 4

6.2.1 Shape and fit ........................................................................................................................................................................ 4

6.2.2 Exposed area ....................................................................................................................................................................... 4

6.2.3 Thickness of test specimens .................................................................................................................................. 4

6.3 Number of test specimens ............................................................................................................................................................. 5

6.4 Conditioning of test specimens ................................................................................................................................................. 5

6.5 Testing low resistance specimens .......................................................................................................................................... 5

7 Procedure..................................................................................................................................................................................................................... 5

7.1 Test conditions ........................................................................................................................................................................................ 5

7.2 Preparation of specimen and test assembly .................................................................................................................. 7

7.3 Test procedure ......................................................................................................................................................................................... 7

8 Calculation and expression of results ............................................................................................................................................. 8

8.1 Mass change rate ................................................................................................................................................................................... 8

8.2 Density of water vapour flow rate .......................................................................................................................................... 9

8.3 Water vapour permeance .............................................................................................................................................................. 9

8.4 Water vapour resistance ..............................................................................................................................................................10

8.5 Water vapour permeability .......................................................................................................................................................10

8.6 Water vapour resistance factor..............................................................................................................................................10

8.7 Water vapour diffusion-equivalent air layer thickness .....................................................................................11

9 Accuracy of measurement .......................................................................................................................................................................11

9.1 General ........................................................................................................................................................................................................11

9.2 Specimen area .......................................................................................................................................................................................11

9.3 Specimen thickness ..........................................................................................................................................................................11

9.4 Sealants ......................................................................................................................................................................................................12

9.5 Weighing precision ...........................................................................................................................................................................12

9.6 Control of environmental conditions ................................................................................................................................12

9.7 Variations in barometric pressure during test .........................................................................................................12

10 Test report ................................................................................................................................................................................................................12

Annex A (normative) Methods suitable for self-supporting materials ..........................................................................14

Annex B (normative) Methods suitable for loose fills .....................................................................................................................16

Annex C (normative) Methods suitable for membranes and foils ......................................................................................18

Annex D (normative) Methods suitable for mastics and sealants ......................................................................................19

Annex E (normative) Methods suitable for paint, varnishes, etc.........................................................................................21

Annex F (normative) Correction for the effect of a masked edge of a specimen .................................................22

Annex G (normative) Correction for resistance of air layers ...................................................................................................24

© ISO 2016 – All rights reserved iii
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SIST EN ISO 12572:2016
ISO 12572:2016(E)

Annex H (normative) Method for calculating the water vapour resistance of the air layer in

the cup ..........................................................................................................................................................................................................................25

Annex I (informative) Weighing repeatability, weighing interval and specimen size needed

to achieve desired accuracy ...................................................................................................................................................................26

Annex J (informative) Conversion table for water vapour transmission units......................................................27

Bibliography .............................................................................................................................................................................................................................28

iv © ISO 2016 – All rights reserved
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SIST EN ISO 12572:2016
ISO 12572:2016(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 World Trade Organization (WTO) principles in the

Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html

ISO 12572 was prepared by the European Committee Standardization (CEN) Technical Committee

CEN/TC 89, Thermal performance of buildings and building components, in collaboration with ISO

Technical Committee ISO/TC 163, Thermal performance and energy use in the built environment,

Subcommittee SC 1, Test and measurement methods, in accordance with the agreement on technical

cooperation between ISO and CEN (Vienna Agreement).

This second edition cancels and replaces the first edition (ISO 12572:2001), which has been technically

revised with the following changes:
— addition of insulation materials in the Scope;
— addition of e) humidity chamber in Clause 5;

— addition of requirements regarding thickness of test specimen to measure the permeability of core

materials in 6.2.3;
— change of specimen area size in 6.3;

— addition of requirements for storage time and relative humidity for condition D in 6.4;

— new clause with requirements in 6.5;

— change of requirements for temperature and relative humidity for test conditions in 7.1;

— change of the calculation of mass change rate in 8.1;
— removal of 9.8.
© ISO 2016 – All rights reserved v
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SIST EN ISO 12572:2016
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SIST EN ISO 12572:2016
INTERNATIONAL STANDARD ISO 12572:2016(E)
Hygrothermal performance of building materials and
products — Determination of water vapour transmission
properties — Cup method
1 Scope

This document specifies a method based on cup tests for determining the water vapour permeance of

building products and the water vapour permeability of building materials under isothermal conditions.

Different sets of test conditions are specified.

The general principles are applicable to all hygroscopic and non-hygroscopic building materials and

products, including insulation materials and including those with facings and integral skins. Annexes

give details of test methods suitable for different material types.

The results obtained by this method are suitable for design purposes, production control and for

inclusion in product specifications.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

There are no normative references in this document.
3 Terms, definitions, symbols, units and subscripts
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 9346 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
density of water vapour flow rate
mass of water vapour transferred through the specimen per area and per time
3.1.2
homogeneous material

material with properties likely to affect the transmission of water vapour which do not vary on a

macroscopic scale
3.1.3
impermeable material

material with a measured water vapour diffusion-equivalent air layer thickness (3.1.8) greater than 1 500 m

3.1.4
water vapour permeance

density of water vapour flow rate (3.1.1) divided by the water vapour pressure difference between the

two specimen faces
© ISO 2016 – All rights reserved 1
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SIST EN ISO 12572:2016
ISO 12572:2016(E)
3.1.5
water vapour resistance
reciprocal of water vapour permeance (3.1.4)
3.1.6
water vapour permeability

product of the water vapour permeance (3.1.4) and the thickness of a homogeneous specimen

Note 1 to entry: Water vapour permeability can only be calculated for specimens of a homogeneous material

(3.1.2).
3.1.7
water vapour resistance factor

water vapour permeability (3.1.6) of air divided by that of the material concerned

Note 1 to entry: The water vapour resistance factor indicates how much greater the resistance of the material is

compared to an equally thick layer of stationary air at the same temperature.
3.1.8
water vapour diffusion-equivalent air layer thickness

thickness of a motionless air layer which has the same water vapour resistance (3.1.5) as the specimen

3.2 Symbols and units
Symbol Quantity Unit
A area of specimen m
G water vapour flow rate through specimen kg/s
R gas constant for water vapour = 462 N·m/(kg⋅K)
S hydraulic diameter of specimen m
T thermodynamic temperature K
W water vapour permeance with respect to partial vapour kg/(m ⋅s⋅Pa)
pressure
Z water vapour resistance with respect to partial vapour m ⋅s⋅Pa/kg
pressure
d mean thickness of specimen m
g density of water vapour flow rate kg/(m ⋅s)
l diameter of circle or side of square specimen m
m mass of specimen and cup assembly kg
p barometric pressure hPa
p standard barometric pressure = 1 013,25 hPa
S water vapour diffusion-equivalent air layer thickness m
t time s
Δp water vapour pressure difference across specimen Pa
δ water vapour permeability kg/(m⋅s⋅Pa)
δ water vapour permeability of air kg/(m⋅s⋅Pa)
μ water vapour resistance factor —
θ celsius temperature °C
φ relative humidity —

NOTE The above units comply with ISO 9346; a conversion table to other units commonly used in

permeability measurements is given in Annex J.
2 © ISO 2016 – All rights reserved
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SIST EN ISO 12572:2016
ISO 12572:2016(E)
3.3 Subscripts
Subscript Denoting
I interval
r repeatability
a air
c corrected for air layer
f film
j joint
m membrane
me masked edge
s specimen
t total
4 Principle

The test specimen is sealed to the open side of a test cup containing either a desiccant (dry cup) or

an aqueous saturated solution (wet cup). The assembly is then placed in a temperature and humidity

controlled test chamber. Because of the different partial vapour pressure between the test cup and the

chamber, a vapour flow occurs through permeable specimens. Periodic weighings of the assembly are

made to determine the rate of water vapour transmission in the steady-state.
5 Apparatus

a) Test cups resistant to corrosion from the desiccant or salt solutions they contain; typically cups are

made of glass or metal.

The design of cups suitable for testing various different types of materials is described in

Annexes A to E.

NOTE Circular cups can be easier to seal and transparent cups allow better control of salt solutions.

b) For certain cups and sealing methods (see Annex A), a template, with shape and size corresponding

to that of the test cup, is used when applying the sealant to give a sharply defined, reproducible test

area. The template shall have an area of at least 90 % of the specimen to limit nonlinear vapour flow.

c) Measuring instruments capable of determining specimen thickness with accuracy required in 7.2.

d) Analytical balance, capable of weighing the test assembly with the repeatability needed for the

required accuracy. Wherever possible, a balance of 0,001 g resolution shall be used. For heavy test

assemblies, a balance resolution of 0,01 g may be sufficient (see Annex I for information linking the

balance resolution to the duration of test).

NOTE The factors that affect the necessary accuracy of measurement are discussed in Annex I.

e) Constant temperature, constant humidity chamber, capable of being maintained within ±5 %

relative humidity around the set point relative humidity and ±1,0 K around the set point

temperature. In order to ensure uniform conditions throughout the chamber, the air shall be

stirred so as to obtain velocities between 0,02 m/s and 0,3 m/s. If highly permeable materials are

being tested, means should be provided to measure the air speed directly over the upper surface of

the specimen (see Annex G).

f) Suitable sensors and a logging system to continuously record the temperature, relative humidity

and, if necessary, the barometric pressure within the test chamber. The sensors shall be calibrated

at regular intervals.
© ISO 2016 – All rights reserved 3
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SIST EN ISO 12572:2016
ISO 12572:2016(E)

g) Sealant, which is impermeable to water vapour, does not undergo physical or chemical changes

during the test and does not cause physical or chemical changes to the specimen.

NOTE Examples of sealants suitable for specific materials, if necessary, are listed in the appropriate

Annex.
6 Test specimens
6.1 General principles for preparation of test specimens

The test specimens shall be representative of the product. If the product has natural skins or integral

facings, these may be included in the test specimen, but they shall be removed if it is intended to

measure the permeability of the core material. If the skins or facings are different on the two sides,

specimens shall be tested with vapour flow in the direction of the intended use. If the direction of flow

is not known, duplicate specimens shall be prepared and tests carried out for each direction of flow.

Unless the product to be tested is isotropic, the test specimens shall be cut so that the parallel faces are

normal to the direction of vapour flow of the product in use.

Specimen preparation shall not involve methods which damage the surface in ways which affect the

flow of water vapour.
6.2 Dimensions of test specimens
6.2.1 Shape and fit

Test specimens shall be cut to correspond with the dimensions of the chosen test assembly (see

Annexes A to E).
6.2.2 Exposed area

The diameter of a circular specimen or the side of a square specimen shall be at least twice the specimen

thickness. The exposed area (the arithmetic mean of the upper and lower free surface areas) shall be at

least 0,005 m . The upper and lower free surface areas shall not differ by more than 3 % of the mean in

the case of homogeneous materials and by no more than 10 % in the case of other materials.

6.2.3 Thickness of test specimens

Whenever possible, the thickness of the specimen shall be that of the product in use. In the case of

homogeneous materials, if the thickness exceeds 100 mm, this may be reduced by cutting. In the case

of non-homogeneous materials, such as concrete containing aggregates, the thickness should be at least

three times (and preferably five times) the largest particle size.

If a material contains macroscopic formed voids, the solid material should be tested and the resistance

of the whole material calculated from the proportions of solid to air space assuming one dimensional

vapour flow.

If it is necessary to test a product so thick that the available test cups do not have an area large enough

to comply with 6.2.2, the product may, only as a last resort, be sliced. In this case, all slices shall be

tested and the results reported.

If it is intended to measure the permeability of the core material, all skins and facings shall be removed

and the test specimens shall have a thickness of at least 20 mm.

NOTE There is a risk that this procedure leads to significant inaccuracies, especially when wet cup tests are

carried out on hygroscopic materials.
4 © ISO 2016 – All rights reserved
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SIST EN ISO 12572:2016
ISO 12572:2016(E)
6.3 Number of test specimens
If the specimen area is less than 0,05 m , a minimu
...

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