ISO 24353:2008
(Main)Hygrothermal performance of building materials and products — Determination of moisture adsorption/desorption properties in response to humidity variation
Hygrothermal performance of building materials and products — Determination of moisture adsorption/desorption properties in response to humidity variation
ISO 24353:2008 specifies a test method for determining moisture adsorption/desorption properties of building materials in response to humidity variation. ISO 24353:2008 also defines the adsorption/desorption efficiency of building materials, measured as the change in mass of a specimen moved from a given space to another one of different relative humidity and equal temperature. Moisture adsorption/desorption properties of materials are measured under conditions of a single cycle and several cycles.
Performance hygrothermique des matériaux et produits pour le bâtiment — Détermination des propriétés d'adsorption/désorption de l'humidité en réponse à une fluctuation de l'humidité
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INTERNATIONAL ISO
STANDARD 24353
First edition
2008-09-15
Hygrothermal performance of building
materials and products — Determination
of moisture adsorption/desorption
properties in response to humidity
variation
Performance hygrothermique des matériaux et produits pour le
bâtiment — Détermination des propriétés d'adsorption/désorption de
l'humidité en réponse à une fluctuation de l'humidité
Reference number
©
ISO 2008
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ii © ISO 2008 – All rights reserved
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols. 1
3.1 Terms and definitions. 1
3.2 Symbols and units. 2
4 Test specimens . 3
4.1 General. 3
4.2 Size. 3
4.3 Thickness . 3
4.4 Number of specimens . 3
5 Test apparatus . 3
6 Setting of water vapour surface resistance . 4
7 Test method. 4
7.1 Test conditions . 4
7.2 Single cycle test of moisture adsorption/desorption content. 5
7.3 Cyclic test of regular moisture adsorption/desorption content . 6
8 Calculation. 7
8.1 Moisture adsorption/desorption content and the differences between them . 7
8.2 Moisture adsorption/desorption rates. 8
8.3 Fourth cycle moisture adsorption/desorption content. 8
9 Test report . 10
Annex A (normative) Setting of air flow on test specimen surface . 11
Annex B (informative) Apparatus using salt saturated aqueous solution . 13
Annex C (informative) Calculation procedure of moisture infiltration coefficient. 17
Bibliography . 18
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 24353 was prepared by Technical Committee ISO/TC 163, Thermal performance and energy use in the
built environment, Subcommittee SC 1, Test and measurement methods.
iv © ISO 2008 – All rights reserved
Introduction
This International Standard describes a test method that is applicable to materials used to inhibit fluctuation of
indoor relative humidity. Testing of sorption/desorption efficiency permits the evaluation of materials for
applications such as adjusting the relative humidity of museum storage and exhibition spaces.
Materials selected for their adsorption/desorption efficiency have recently come to be used in homes and
medical care facilities in the interest of creating healthy and comfortable indoor environments.
INTERNATIONAL STANDARD ISO 24353:2008(E)
Hygrothermal performance of building materials and
products — Determination of moisture adsorption/desorption
properties in response to humidity variation
1 Scope
This International Standard specifies a test method for determining moisture adsorption/desorption properties
of building materials in response to humidity variation. This International Standard also defines the
adsorption/desorption efficiency of building materials, measured as the change in mass of a specimen moved
from a given space to another one of different relative humidity and equal temperature.
Moisture adsorption/desorption properties of materials are measured under conditions of a single cycle and
several cycles.
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 12571:2000, Hygrothermal performance of building materials and products — Determination of
hygroscopic sorption properties
ISO 12572:2001, Hygrothermal performance of building materials and products — Determination of water
vapour transmission properties
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
moisture adsorption/desorption property
property of a material related to its capacity for and efficiency in moisture adsorption/desorption
3.1.2
moisture adsorption process
process by which moisture is adsorbed into a material from ambient air until equilibrium is reached
3.1.3
moisture desorption process
process by which moisture is desorbed from a material into ambient air until equilibrium is reached
3.1.4
moisture adsorption content
amount of moisture adsorbed into a specimen of a given material per unit of surface area of that material
3.1.5
moisture desorption content
amount of moisture desorbed by a specimen of a given material per unit of surface area of that material
3.1.6
water vapour surface resistance
resistance against the transfer of water vapour across the boundary layer between the ambient air and the
surface of a building component such as a wall
3.1.7
resistance of water vapour transmission
resistance against the transfer of water vapour through a building component, such as wall, from one surface
in contact with the water vapour in the air to the other
3.1.8
moisture adsorption rate
rate of adsorbing moisture of the material from the ambient air
3.1.9
moisture desorption rate
rate of desorbing moisture of the material to the ambient air
3.2 Symbols and units
Symbol Description Unit
A Surface area of adsorption/desorption m
G Adsorption/desorption rate at time n kg/(m ·h)
n
m Mass of the specimen after preconditioning kg
m Mass of the specimen at the time of completion of moisture adsorption process kg
a
m Mass of the specimen at the time of completion of moisture adsorption process of the kg
a4
4th adsorption/desorption cycle
m Mass of the specimen at the time of completion of moisture desorption process kg
d
m Mass of the specimen at the time of completion of moisture desorption process of the kg
d3
3rd adsorption/desorption cycle
m Mass of the specimen at the time of completion of moisture desorption process of the kg
d4
4th adsorption/desorption cycle
m Mass of specimen at time n kg
n
m Mass of specimen at time n−1 kg
n−1
R Resistance of water vapour on single-layered specimen m ·h·Pa/µg
R Resistance of water vapour on double-layered specimen m ·h·Pa/µg
∆t Elapsed time h
1/β Water vapour surface resistance of specimen m ·h·Pa/µg
ρ Change of moisture content at the time of completion of adsorption process kg/m
A,a
ρ Moisture adsorption content at the time of completion of moisture adsorption process of kg/m
A,ac
the 4th sorption/desorption cycle
ρ Moisture desorption content at the time of completion of desorption process kg/m
A,d
ρ Moisture desorption content at the time of completion of moisture desorption process of kg/m
A,dc
the 4th adsorption/desorption cycle
ρ Difference between moisture adsorption/desorption content at the time of completion of kg/m
A,s
the test
ρ Difference between moisture adsorption/desorption content at the time of completion of kg/m
A,sc
the 4th adsorption/desorption cycle
2 © ISO 2008 – All rights reserved
4 Test specimens
4.1 General
The specimen shall be representatives of the product. The size, the thickness and the number of specimens
shall be as specified in 4.2 to 4.4, or otherwise selected ensuring that their moisture adsorption/desorption
properties are properly evaluated.
4.2 Size
The size of a specimen shall be at most 250 mm × 250 mm but shall not be less than 100 mm × 100 mm.
4.3 Thickness
The thickness of a specimen shall be the same as the thickness of the product.
4.4 Number of specimens
The number of specimens shall be one piece for each test condition.
5 Test apparatus
The test apparatus consists of an electronic balance, a moisture-proof box with a programmable air
conditioner and a thermometer, as shown in Figure 1. An apparatus of any structure may be used as long as
the criteria of measurement precision described for the different pieces of equipment (5.1 to 5.4) are satisfied.
5.1 Electronic balance, capable of weighing to the nearest 0,01 g for test specimens up to 6 kg.
For test specimens exceeding 6 kg, an electronic balance capable of weighing to the nearest 0,1 g may be
used.
5.2 Moisture-proof box with thermostat and/or hygrostat, equipped with a programmable air conditioner
capable of being set at a specific temperature and humidity, having sufficient capacity to accommodate the
specimen and containing the elements listed in 5.2.1 to 5.2.4.
5.2.1 Temperature sensor, positioned about 50 mm from the centre of the adsorption/desorption surface
of the specimen and enabling the temperature to be maintained throughout the moisture-proof box to within
± 0,5 °C.
5.2.2 Humidity gauge, of which the sensor of the hygrometer is positioned about 50 mm from the centre of
the moisture adsorption/desorption surface of the specimen and enables the humidity to be maintained
throughout the moisture-proof box
...
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