ISO 20393-2007 Thermal-insulating materials - Determination of long-term water absorption by diffusion《隔热材料 通过扩散测定长期吸水率》.pdf

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1、 Reference number ISO 20393:2007(E) ISO 2007INTERNATIONAL STANDARD ISO 20393 First edition 2007-06-15 Thermal-insulating materials Determination of long-term water absorption by diffusion Matriaux disolation thermique Dtermination de labsorption deau long terme par diffusion ISO 20393:2007(E) PDF di

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6、 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 copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2007 All rights reservedISO 20393:2007(E) ISO 2007 All rights reserved iii Forewor

7、d 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 technica

8、l 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 ele

9、ctrotechnical 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 th

10、e 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 ide

11、ntifying any or all such patent rights. ISO 20393 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular plastics. INTERNATIONAL STANDARD ISO 20393:2007(E) ISO 2007 All rights reserved 1 Thermal-insulating materials Determination of long-term water absorption by diffus

12、ion 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 perio

13、d 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

14、 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 refer

15、enced 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

16、 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

17、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.

18、 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 0,5) C. 5.5 Tap water, kept at a temperature of (50 1) C. ISO 20393:2007(E) 2 ISO 2007 All rights reservedThe basic

19、 principles of the apparatus are illustrated in Figure 1. Dimensions in millimetres Key 1 cooling plate 2 thermal insulation for cooling plate and container 3 coolant inlet and outlet 4 test specimen 5 corrosion-resistant container with a frame supporting the test specimen 6 tap water 7 heating devi

20、ce with thermostat 8 seal Figure 1 Example of apparatus for determining water absorption by diffusion ISO 20393:2007(E) ISO 2007 All rights reserved 3 6 Test specimens 6.1 Dimensions The thickness of the test specimens shall be the original product thickness. The test specimens shall be squares, wit

21、h squarely cut edges, having sides of length (500 1) mm. If the product is not large enough to permit this size of test specimen, the test specimen size shall be reduced accordingly. Test specimens shall contain no joints. 6.2 Number The number of test specimens shall be at least two. 6.3 Preparatio

22、n The test specimens shall be cut so that they do not include original product edges. Test specimens shall be prepared by methods that do not substantially change the original structure of the product. Any facings, skins and/or coatings shall be retained. NOTE Special methods of preparation, when ne

23、eded, are given in the relevant product standard. 6.4 Conditioning The test specimens shall be conditioned for at least 6 h at (23 2) C and (50 10) % relative humidity or (23 5) C and 20 10 50 + % relative humidity or (27 5) C and 20 10 65 + % relative humidity. In cases of dispute, they shall be co

24、nditioned at (23 2) C and (50 5) % relative humidity for the time stated in the relevant product standard, but in any case for a minimum of 6 h. 7 Procedure Measure the dimensions of the test specimens in accordance with ISO 1923. Weigh the test specimen to the nearest 0,1 g to determine its initial

25、 mass, m 0 . Place the test specimen on the frame of the container. If the product is faced on one side, begin the test with the facing uppermost. Seal the bottom edge of the test specimen to the container. The width of the seal shall be u 10 mm (see Figure 1). Place the insulated cooling plate on t

26、op of the test specimen. Subject the test specimen to a temperature and water vapour pressure difference for 28 days, maintaining the tap water at a temperature of (50 1) C and the cooling plate on the other side at a temperature of (1 0,5) C. Turn the test specimen over every 7 days. After 28 days,

27、 remove the test specimen and wipe off any surface water. Weigh the test specimen again to determine its mass, m D . ISO 20393:2007(E) 4 ISO 2007 All rights reserved8 Calculation and expression of results For each test specimen, calculate the long-term water absorption by diffusion, W dPor W dV , in

28、 kilograms per square metre or in percent by volume, using Equation (1) or (2), respectively: D0 dP p mm W A = (1) D0 dV pW 100 mm W Ad = (2) where m 0is the initial mass of the test specimen, in kilograms; m Dis the mass of the test specimen after being subjected to a temperature and water vapour p

29、ressure difference for 28 days, in kilograms; A pis the area of the lower surface of the test specimen, in square metres; d is the thickness of the test specimen, in metres; Wis the density of water, assumed to be 1 000 kg/m 3 . The test result shall be taken as the mean value of the individual valu

30、es, rounded to the nearest 0,01 kg/m 2in the case of W dPand to the nearest 0,1 % by volume in the case of W dV . Results shall not be extrapolated to other thicknesses. 9 Precision It has not been possible to include a statement on the precision of the measurements in this edition of this Internati

31、onal Standard, but it is intended to include such a statement when the standard is next revised. 10 Test report The test report shall include the following information: a) a reference to this International Standard; b) product identification: 1) the name of the product, the factory where it was manu

32、factured and the manufacturer or supplier, 2) the production code number, 3) the type of product, 4) the type of packaging, 5) the form in which the product arrived at the laboratory, 6) any other information as appropriate, e.g. nominal thickness, nominal density; ISO 20393:2007(E) ISO 2007 All rig

33、hts reserved 5 c) test procedure: 1) details of pre-test history and sampling, e.g. who sampled and where, 2) details of conditioning, 3) details of any deviations from the requirements specified in Clauses 6 and 7, 4) the dates of testing, 5) the dimensions of the test specimens and the number test

34、ed, 6) general information relating to the test, 7) details of any events which may have affected the results; d) results: record all the individual values and the mean value. Information about the apparatus and the identity of the technician should be available in the laboratory, but need not be recorded in the test report. ISO 20393:2007(E) ICS 83.100 Price based on 5 pages ISO 2007 All rights reserved