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

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Published
Publication Date
05-Jun-2007
Current Stage
9060 - Close of review
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05-Jun-2021
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ISO 20393:2007 - Thermal-insulating materials -- Determination of long-term water absorption by diffusion
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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
---------------------- Page: 1 ----------------------
ISO 20393:2007(E)
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ii © ISO 2007 – All rights reserved
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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

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 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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