SIST EN ISO 12571:2013

SLOVENSKI STANDARD
SIST EN ISO 12571:2013
01-november-2013
1DGRPHãþD
SIST EN ISO 12571:2001
Higrotermalno obnašanje gradbenih materialov in proizvodov - Ugotavljanje
higroskopnosti (ISO12571:2013)
Hygrothermal performance of building materials and products - Determination of
hygroscopic sorption properties (ISO 12571:2013)
Wärme- und feuchtetechnisches Verhalten von Baustoffen und Bauprodukten -
Bestimmung der hygroskopischen Sorptionseigenschaften (ISO 12571:2013)
Performance hygrothermique des matériaux et produits pour le bâtiment - Détermination
des propriétés de sorption hygroscopique (ISO 12571:2013)
Ta slovenski standard je istoveten z: EN ISO 12571:2013
ICS:
91.100.01 Gradbeni materiali na Construction materials in
splošno general
91.120.30 =DãþLWDSUHGYODJR Waterproofing
SIST EN ISO 12571:2013 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 12571:2013

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SIST EN ISO 12571:2013


EUROPEAN STANDARD
EN ISO 12571

NORME EUROPÉENNE

EUROPÄISCHE NORM
August 2013
ICS 91.100.01 Supersedes EN ISO 12571:2000
English Version
Hygrothermal performance of building materials and products -
Determination of hygroscopic sorption properties (ISO
12571:2013)
Performance hygrothermique des matériaux et produits Wärme- und feuchtetechnisches Verhalten von Baustoffen
pour le bâtiment - Détermination des propriétés de sorption und Bauprodukten - Bestimmung der hygroskopischen
hygroscopique (ISO 12571:2013) Sorptionseigenschaften (ISO 12571:2013)
This European Standard was approved by CEN on 26 July 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
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12571:2013: E
worldwide for CEN national Members.

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SIST EN ISO 12571:2013
EN ISO 12571:2013 (E)
Contents Page
Foreword .3
2

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SIST EN ISO 12571:2013
EN ISO 12571:2013 (E)
Foreword
This document (EN ISO 12571:2013) has been prepared by Technical Committee ISO/TC 163 "Thermal
performance and energy use in the built environment" in collaboration with Technical Committee CEN/TC 89
“Thermal performance of buildings and building components” the secretariat of which is held by SIS.
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 2014, and conflicting national standards shall be withdrawn
at the latest by February 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 ISO 12571:2000.
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 12571:2013 has been approved by CEN as EN ISO 12571:2013 without any modification.

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SIST EN ISO 12571:2013

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SIST EN ISO 12571:2013
INTERNATIONAL ISO
STANDARD 12571
Second edition
2013-08-01
Hygrothermal performance of
building materials and products —
Determination of hygroscopic
sorption properties
Performance hygrothermique des matériaux et produits pour le
bâtiment — Détermination des propriétés de sorption hygroscopique
Reference number
ISO 12571:2013(E)
©
ISO 2013

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SIST EN ISO 12571:2013
ISO 12571:2013(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2013
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
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 2013 – All rights reserved

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SIST EN ISO 12571:2013
ISO 12571:2013(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions, symbols and units . 1
3.1 Terms and definitions . 1
3.2 Symbols and units . 2
4 Principle . 2
4.1 Sorption curve . 2
4.2 Desorption curve . 2
5 Apparatus . 3
5.1 Desiccator method . 3
5.2 Climatic chamber method . 3
6 Test specimens. 3
6.1 Specification of the test specimens . 3
6.2 Number of test specimens . 3
7 Procedure. 3
7.1 Test conditions . 3
7.2 Desiccator method . 4
7.3 Climatic chamber method . 5
8 Calculation and expression of results . 6
8.1 Hygroscopic sorption . 6
8.2 Equilibrium moisture content curves . 6
9 Accuracy of measurement . 7
9.1 Error in moisture content . 7
9.2 Control of environmental conditions . 7
10 Test report . 8
Annex A (informative) Air relative humidities above saturated solutions in equilibrium .9
Annex B (informative) Preparation of saturated solutions .12
Annex C (informative) Example of the procedure for determining a point on a sorption curve .15
Annex D (informative) Method using a glass jar .16
Bibliography .18
© ISO 2013 – All rights reserved iii

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SIST EN ISO 12571:2013
ISO 12571:2013(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 12571 was prepared by the European Committee for Standardization (CEN) in collaboration
with 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 12571:2000), which has been
technically revised.
Annexes A to D of this International Standard are for information only.
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SIST EN ISO 12571:2013
INTERNATIONAL STANDARD ISO 12571:2013(E)
Hygrothermal performance of building materials and
products — Determination of hygroscopic sorption
properties
1 Scope
This International Standard specifies two alternative methods for determining hygroscopic sorption
properties of porous building materials and products:
a) using desiccators and weighing cups (desiccator method);
b) using a climatic chamber (climatic chamber method).
The desiccator method is the reference method.
This International Standard does not specify the method for sampling.
The methods specified in this International Standard can be used to determine the moisture content of
a sample in equilibrium with air at a specific temperature and humidity.
2 Normative references
The following referenced documents are indispensable for the application 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.
ISO 9346, Hygrothermal performance of buildings and building materials — Physical quantities for mass
transfer — Vocabulary
ISO 12570, Hygrothermal performance of building materials and products — Determination of moisture
content by drying at elevated temperature
3 Terms and definitions, symbols and units
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9346 and the following apply.
3.1.1
equilibrium moisture content
moisture content of a porous material in equilibrium with the environment and the relative humidity of
the ambient air, at a specified temperature
3.1.2
moisture content mass by mass
mass of evaporable water divided by mass of dry material
3.1.3
moisture content volume by volume
volume of evaporable water divided by volume of dry material
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SIST EN ISO 12571:2013
ISO 12571:2013(E)

3.1.4
moisture content mass by volume
mass of evaporable water divided by volume of dry material
Note 1 to entry: The mass of water is determined by weighing the specimen before and after drying at the
appropriate drying temperature until constant mass is reached.
3.1.5
sorption curve
curve established at a series of increasing equilibrium relative humidities at a given temperature
3.1.6
desorption curve
curve established at a series of decreasing equilibrium relative humidities at a given temperature
3.2 Symbols and units
Symbol Quantity Unit
m mass of test specimen kg
m mass of dried test specimen kg
0
u moisture content mass by mass kg/kg
3 3
ψ moisture content volume by volume m /m
3
w moisture content mass by volume kg/m
4 Principle
4.1 Sorption curve
The specimen is dried to constant mass. While maintaining a constant temperature, the specimen is
placed consecutively in a series of test environments, with relative humidity increasing in stages. The
moisture content is determined when equilibrium with each environment is reached. Equilibrium with
the environment is established by weighing the specimen until constant mass is reached. A minimum of
four test atmospheres shall be selected in the humidity range under consideration.
After establishing the moisture content at each relative humidity the sorption curve can be drawn.
4.2 Desorption curve
The starting point for desorption is a relative humidity of at least 95 %. This might be the last point
of the sorption curve or might be reached by sorption from a dried test specimen. While maintaining
a constant temperature, the specimen is placed consecutively in a series of test environments, with
relative humidity decreasing in stages. The moisture content is determined when equilibrium with each
environment is reached. Equilibrium with the environment is established by weighing the specimen
until constant mass is reached. A minimum of four test atmospheres shall be selected in the humidity
range under consideration. Finally, the specimen is dried to constant mass.
After establishing the moisture content at each relative humidity the desorption curve can be drawn.
NOTE A defined starting point for desorption has been chosen for better reproducibility.
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SIST EN ISO 12571:2013
ISO 12571:2013(E)

5 Apparatus
5.1 Desiccator method
The test apparatus shall include:
a) weighing cups which do not absorb water and with tight-fitting lids;
b) balance, capable of weighing to an accuracy of ± 0,01 % of the mass of the test specimen;
NOTE If larger weighing cups are used, the weighing accuracy can be determined with respect to the
total mass and the required accuracy of the test results.
c) drying oven, in accordance with ISO 12570;
d) desiccator, capable of maintaining the relative humidity within ± 2 % relative humidity;
e) constant-temperature chamber, capable of maintaining the specified test temperature to an
accuracy of ± 0,5 K.
5.2 Climatic chamber method
The test apparatus shall include:
a) weighing cups which do not absorb water;
b) balance, capable of weighing to an accuracy of ± 0,01 % of the mass of the test specimen;
NOTE If larger weighing cups are used, the weighing accuracy can be determined with respect to the
total mass and the required accuracy of the test results.
c) drying oven, in accordance with ISO 12570;
d) climatic chamber, capable of maintaining the relative humidity within ± 5 % relative humidity and
the temperature within ± 2 K over the whole test area.
6 Test specimens
6.1 Specification of the test specimens
A test specimen shall be representative of the product and have a mass of at least 10 g. Specimens of
3
materials with a dry density less than 300 kg/m shall have an area of at least 100 mm × 100 mm. If it
can be demonstrated from other references that the result will not be affected, a test specimen can be
cut or crushed into smaller pieces to reduce the time to reach equilibrium with the environment.
6.2 Number of test specimens
A minimum of three specimens shall be tested. The procedure in Clause 7 shall be applied to each specimen.
7 Procedure
7.1 Test conditions
Reference sorption curves shall be established at a temperature of (23 ± 0,5) °C or (27 ± 0,5) °C in tropical
countries. If agreed between the parties, sorption curves can be established at other temperatures for
specific applications.
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SIST EN ISO 12571:2013
ISO 12571:2013(E)

7.2 Desiccator method
7.2.1 General
Make up the appropriate saturated aqueous solution to achieve the necessary relative humidity in
the desiccator.
Standard air relative humidities to be selected for measuring sorption curves are shown in Table 1.
Choose 5 or more conditions that include No.2, No.4 and No.6 in Table 1.
NOTE Annex A gives the air relative humidities of various saturated solutions in equilibrium, and Annex B
describes the preparation of various solutions.
Place the desiccator in the constant-temperature chamber (see Figure 1). The depth of saturated aqueous solution
shall be 30 mm–50 mm.
Table 1 — Standard air relative humidities above saturated solutions in equlibrium
Relative humidity
No. Substance
a
(%)
1 KOH 9 8
2 MgCl ·6H O 33 33
2 2
3 Mg(NO ) ·6H O 53 52
3 2 2
4 NaCl 75 75
5 KCl 85 84
6 KNO 93 93
3
a Relative humidities in left column correspond to air temperature 23 °C. Relative
humidities in right column correspond to air temperature 27 °C.
7.2.2 Sorption curve
Weigh the weighing cup and lid when empty and dry. Put the test specimen into the weighing cup without
the lid and dry it until constant mass in the drying oven at the temperature specified
...