ISO 20393:2007
(Main)Thermal-insulating materials — Determination of long-term water absorption by diffusion
Thermal-insulating materials — Determination of long-term water absorption by diffusion
ISO 20393:2007 specifies equipment and procedures for determining the long-term water absorption of test specimens by diffusion. It is intended for use with thermal-insulation products. It is designed to simulate the absorption of water by products subjected for a long period of time not only to high relative humidity, approximating to 100 %, on both sides but also to a water vapour pressure gradient, as experienced by e.g. inverted roof or unprotected ground insulation. The test is not applicable to all types of thermal-insulation product. The product standard should normally state whether this test is applicable to a particular product.
Matériaux d'isolation thermique — Détermination de l'absorption d'eau à long terme par diffusion
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 20393
First edition
2007-06-15
Thermal-insulating materials —
Determination of long-term water
absorption by diffusion
Matériaux d'isolation thermique — Détermination de l'absorption d'eau à
long terme par diffusion
Reference number
ISO 20393:2007(E)
©
ISO 2007
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ISO 20393:2007(E)
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ISO 20393:2007(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
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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 20393 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular plastics.
© ISO 2007 – All rights reserved iii
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INTERNATIONAL STANDARD ISO 20393:2007(E)
Thermal-insulating materials — Determination of long-term
water absorption by diffusion
1 Scope
This International Standard specifies equipment and procedures for determining the long-term water
absorption of test specimens by diffusion. It is intended for use with thermal-insulation products. It is designed
to simulate the absorption of water by products subjected for a long period of time not only to high relative
humidity, approximating to 100 %, on both sides, but also to a water vapour pressure gradient, as experienced
by e.g. inverted roof or unprotected ground insulation.
The test is not applicable to all types of thermal-insulation product. The product standard should normally
state whether this test is applicable to a particular product.
NOTE For unprotected ground insulation, a lower temperature might, when more data is available, replace the test
temperature of 50 °C currently specified in this International Standard.
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 472, Plastics — Vocabulary
ISO 1923, Cellular plastics and rubbers — Determination of linear dimensions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 apply.
4 Principle
The long-term water absorption by diffusion is determined by measuring the increase in mass of a test
specimen when it is subjected to a water vapour pressure difference and temperature gradient between its
upper and lower surfaces for a period of 28 days.
5 Apparatus and materials
5.1 Balance, capable of determining the mass of the test specimen to within 0,1 g.
5.2 Corrosion-resistant container, with a frame supporting the test specimen.
5.3 Heating device, with a thermostat capable of controlling the water temperature at (50 ± 1) °C.
5.4 Cooling plate, thermally insulated on the outside, operating at a temperature of (1 ± 0,
...
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