1、BRITISH STANDARDBS EN ISO 15496:2004Textiles Measurement of water vapour permeability of textiles for the purpose of quality controlICS 59.080.01g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g
2、37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58IncorporatingFebruary 2006 corrigendumNational forewordThis is the UK implementation of EN ISO 15496:2004. It is identical with ISO 15496:2004, incorporating corrigendum February 2006.The UK participation in its preparation was entrusted to Technical Comm
3、ittee TCI/24, Physical testing of textiles.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a Br
4、itish Standard cannot confer immunity from legal obligations.BS EN ISO 15496:2004This British Standard was published under the authority of the Standards Policy and Strategy Committee on28 May 2004 BSI 2011Amendments/corrigenda issued since publicationDate Comments 30 September 2011 Implementation o
5、f ISO corrigendum February 2006; replacement of equation 3 and first equation in Annex BISBN 978 0 580 76374 8EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 15496May 2004ICS 59.080.01English versionTextiles - Measurement of water vapour permeability of textilesfor the purpose of quality contr
6、ol (ISO 15496:2004)Textiles - Mesurage de la permabilit la vapeur deaudes textiles dans le but du contrle qualit (ISO15496:2004)Textilien - Messung der Wasserdampfdurchlssigkeit vonTextilien als Qualittskontrolle (ISO 15496:2004)This European Standard was approved by CEN on 23 April 2004.CEN members
7、 are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to
8、 the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same sta
9、tus as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia,
10、Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national M
11、embers.Ref. No. EN ISO 15496:2004: E2 Foreword This document (EN ISO 15496:2004) has been prepared by Technical Committee ISO/TC 38 “Textiles“ in collaboration with Technical Committee CEN/TC 248 “Textiles and textile products“, the secretariat of which is held by BSI. This European Standard shall b
12、e given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2004, and conflicting national standards shall be withdrawn at the latest by November 2004. According to the CEN/CENELEC Internal Regulations, the national standards org
13、anizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
14、Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 15496:2004 has been approved by CEN as EN ISO 15496:2004 without any modifications. BS EN ISO 15496:2004EN ISO 15496:2004 (E)Reference numberISO 15496:2004(E)ISO 2004INTERNATIONAL STANDARD ISO16945tide tsriFi
15、no-400210-50Textiles Measurement of water vapour permeability of textiles for the purpose of quality control Textiles Mesurage de la permabilit la vapeur deau des textiles dans le but du contrle qualit Referecne unbmerOSI 69451:002)E(4OSI 4002INTERNATIONAL STANDARD ISO15496First edition2004-05-01eli
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19、gn Evyre caer neeb sah taken to sneeru that the file is suitlbae fosu re yb ISO memdob rebeis. In tlnu ehikletneve y ttah lborp aem leratit gno it is f,dnuo plsaee inform ttneC ehlar Secrteiraat ta the serddaig sleb nevwo. ii BS EN ISO 15496:2004EN ISO 15496:2004 (E)iiiContents Page Foreword iv 1 Sc
20、ope 1 2 Terms and definitions. 1 3 Symbols and units 1 4 Principle . 2 5 Apparatus 2 6 Preparation 3 7 Test procedure 3 8 Calculation and expression of results 4 9 Precision of results. 4 10 Test report . 5 Annex A (informative) Water vapour permeability Application of test results 8 Annex B (inform
21、ative) Physical principle behind the test method 9 Annex C (informative) Dry desiccant cup methods 11 Bibliography . 12 BS EN ISO 15496:2004EN ISO 15496:2004 (E)iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bod
22、ies). 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
23、 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,
24、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 cast
25、ing 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 15496 was prepared by Technical Committee ISO/TC 38, Textiles, Subcommittee SC 2, Cle
26、ansing, finishing and water resistance tests. BS EN ISO 15496:2004EN ISO 15496:2004 (E)1Textiles Measurement of water vapour permeability of textiles for the purpose of quality control 1 Scope This International Standard describes a comparatively simple method for testing the water vapour permeabili
27、ty of textiles that will provide the manufacturer with a clearly recognized method for quality control within the plant. The simple test method described in this International Standard is not applicable for classifying the water vapour resistance of textiles against values relating to physiological
28、effects specified in product standards, and particularly not those relating to personal protective equipment. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 water vapour permeability WVP characteristic of a textile material describing the am
29、ount of water vapour diffusing through the textile per square metre, per hour and per unit difference of water vapour pressure across the textile 3 Symbols and units Symbol Description Unit a Area of the measuring cup opening m2t Measuring time h m Change in mass of the measuring cup during the peri
30、od t g mappChange in mass of the measuring cup on the specimen holder with only membrane during the period t g p Partial water vapour pressure difference across the specimen Pa psaSaturated water vapour pressure at the test room temperature TaPa psbSaturated water vapour pressure at the water bath t
31、emperature TbPa RH Relative humidity in equilibrium with saturated potassium acetate solution % TaTemperature in the test room C TbTemperature of the water bath C WVP Water vapour permeability of the specimen g/m2Pah WVPappApparatus water vapour permeability g/m2Pah BS EN ISO 15496:2004EN ISO 15496:
32、2004 (E)2 4 Principle The specimen to be tested is placed, together with a waterproof but highly water-vapour-permeable, hydrophobic, microporous membrane (henceforth referred to as “membrane”), on a ring holder and then put in a water bath so that the membrane is in contact with the water. This is
33、then left for 15 min. A cup containing saturated potassium acetate solution, creating a relative humidity of about 23 % at the specimens upper face, and covered with a second piece of the same membrane, is weighed and then inverted above the specimen in the ring holder, so that the membrane is in co
34、ntact with the specimen. There will be a net transfer of water vapour through the specimen from the water side to the cup (see Figure 1). After 15 min the cup is taken off and re-weighed. At the same time a control test without a specimen is carried out to determine the water vapour permeability of
35、the two membranes, the apparatus water vapour permeability. The water vapour permeability of the specimen can then be calculated, correcting for the influence of the two membranes. 5 Apparatus The schematics of the test set-up are shown in Figure 1. 5.1 Membrane Any membrane used shall be waterproof
36、, microporous and hydrophobic1). It shall have a high water vapour permeability, so that two layers of the membrane have a water vapour permeability of more than 1,2 g/m2Pah when measured according to this International Standard. 5.2 Specimen holder The specimen holder shall be a metal or plastic ri
37、ng with a milled groove onto which the specimen in conjunction with the membrane is secured, using a rubber ring that fits into the groove, as shown in Figure 2. The rubber ring shall fit tightly so that the specimen and membrane are held under tension. The bottom outside edge of the specimen holder
38、 should be radiused. 5.3 Support frame for specimen holders The support frame should consist of two plates, separated by spacers, that support the specimen holders in the water (see Figure 3). Both plates should have at least six holes cut out, those in the top plate being large enough to allow the
39、holder with specimen and membrane to pass through. The holes in the lower plate are smaller than the specimen holder, but larger than the cup opening, and they are centred to the holes in the top plate. The support frame is fitted with four vertically adjustable screws so that the specimen holder ca
40、n be immersed to a depth of (5 2) mm in the water. The holes in the support frame should be sequentially numbered. 5.4 Water bath The water bath shall consist of a transparent glass or plastic tank, large enough to accommodate the support frame, containing distilled water maintained at (23,0 0,1) C
41、by means of an immersion thermostat with a circulation pump. The water temperature shall be measured in at least four positions simultaneously, adjacent to the four corners of the support frame. In order to obtain a uniform temperature distribution in the water, the inlet or outlet pipe of the therm
42、ostat circulation pump shall be extended by means of a hose to the tank end opposite the thermostat. Care should be taken to prevent air bubble formation by either boiling the distilled water prior to use and/or reducing the speed of the thermostat agitator. 1) This product is commercially available
43、 from, among others: W. L. Gore Goodfellow Cambridge Ltd., Ermine Business Park, Huntingdon, PE 29 6WR, UK; Goodfellow Corp., 800 Lancaster Av., Berwyn, PA 19312-1780, USA. This information is given for the convenience of users of this International Standard and does not constitute an endorsement by
44、 ISO of these products. BS EN ISO 15496:2004EN ISO 15496:2004 (E)35.5 Measuring cup, made from transparent plastic and having an internal diameter of between 85 mm and 95 mm, with a tolerance of 1 mm, and a volume of at least 250 ml. 5.6 Potassium acetate solution Saturated potassium acetate solutio
45、n shall be made by thoroughly mixing dry potassium acetate (p.a. grade) with distilled water in the ratio of 100 g potassium acetate to 31 g of water. The mixture shall be homogeneous and free of lumps; it shall be allowed to equilibrate at a temperature of (23 3) C for a period of not less than 12
46、h. It shall be fluid enough to cover the membrane when the cup is inverted prior to testing. The solution shall remain saturated (indicated by its white or opaque appearance) throughout the test. 5.7 Balance, capable of determining a mass of approximately 150 g with a precision of 1 mg. 5.8 Test roo
47、m, maintained at (23 3) C. 6 Preparation 6.1 Specimens Cut three circular specimens of the textile with diameter of approximately 180 mm. The membrane used as the specimen cover in the specimen holder should have a diameter of approximately 200 mm. When the specimen is fitted onto the specimen holde
48、r, the side that during use would face the body shall be, unless otherwise requested, in contact with the specimen holders membrane. Specimen and membrane shall be secured without creases or distortion on the specimen holder by means of a rubber ring. There shall be no air gaps between the specimen
49、and membrane. Prepare a control specimen holder with membrane only, so that the apparatus water vapour permeability can be measured. 6.2 Measuring cups Fill each measuring cup with approximately 120 g of the saturated potassium acetate solution and then seal with a circular piece of membrane. For this purpose, briefly roll the edges of the measuring cup against a hot iron or soldering iron, whilst keeping the membrane taut, e.g. by using a rubber band. Excess membrane should be trimmed in order that the contents of
