1、CEN EN*ISO*7237 75 3404589 OL07819 577 BRITISH STANDARD Textiles - Determination of the permeability of fabrics to air The European Standard EN IS0 9237 : 1995 has the status of a British Standard BS EN IS0 9237 : 1995 CEN EN*IS0*9237 95 = 3404589 0309820 299 Amd. No. Date BS EN Is0 9237 : 1995 Text
2、 affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee TCI/24, Physical testing of textiles, upon which the following bodies were represented Association of Consuiting Scientists Association of Suppliers to the British
3、 Clothing Industry British Apparel and Textile Confederation British Measurement and Testing Association British Polyolen Textiles Association British Textile Technology Group British Throwsters? Association F?urniture Indm Research Association International Wool Secretariat Minsitry of Defence SATR
4、A Footwear Technology Centre Society of Dyers and Colourists Textile Finishers? Association Textile Institute This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effec
5、t on 15 October 1995 O BSI 1995 The following BSI references relate to the work on this Standard: Committee reference TCi24 Draft for comment 93B06333 DC ISBN O 680 24742 2 CEN EN*IS0*9237 95 m 3404589 0109B21 125 m BS EN IS0 9237 : 1995 Contents Committees responsible page Inside front cover Nation
6、al foreword ii Foreword 2 Method 1 Scope 2 Normative references 3 Denition 4 Principle 6 Sampling 6 7 Apparatus Atmospheres for conditioning and testing 8 Conditioning of samples and test conditions 4 9 Testprocedure 4 10 Calculation and expression of results 4 11 Test report 5 Annex A (informative)
7、 Advice on checking the calibration and conducting the test (normative) Normative references to international publications with their relevant European publications 8 6 B (informative) Suggested sampiing procedure 7 ZA i _ _ (EN EN*IS0*9237 95 m 3404589 O109822 Ob1 m BS EN IS0 9237 : 1995 National f
8、oreword This British Standard has been prepared by Technical Committee TCI/24 and is the English language version of EN IS0 9237 : 1995 published by the European Committee for Standardization (CEN), which is identical with IS0 9237 : 1995, published by the Indonal Organization for Standar-on (ISO).
9、This British Standard supersedes BS 5636 : 1990 which is withdrawn. Cross-references Publication referred to Corresponding British Standard BS 903 Physical testing of rubber Part A26 : 1995 Method for detemzination of hard.rzess BS EN 20139 : 1992 Tmtiles. Standard atmospheres for conditioning and t
10、esting BS EN 30012 Quality assurance requirements for measuring equipnent BS EN 30012-1 : 1994 Metrological confimtion system for measuring equipment ISO4: 1994 IS0 139 : 1973 IS0 10012-1 : 1992 Compliance with a British Standard does not of itself confer immunity from legal obligations. CEN EN*IS0*
11、9237 95 = 3404589 0309823 TTB = EUROPEAN STANDARD EN IS0 9237 NORNE EUR0PEE”E RTROPmE NORM June 1995 ICs 59.080.30 Descriptors: Textiles, fabrics, tests, determination, gas permeability English version Textiles - Determination of permeability of fabrics to air (IS0 9237 : 1995) Textiles - Dterminati
12、on de la permabilit lair des toffes (IS0 9237 : 1995) Textilien - Bestimmung der Luftdurchlssigkeit von textilen Flachengebilden (EO 9237 : 1995) This European Standard was approved by CEN on 19950505. CEN members are bound to comply with the CENKENELEC internal Regdations which stipulate the condit
13、ions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtahed on application to the Central Secretariat or to any CEN member. This European Standard exists in three of
14、ficial versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notifed to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria,
15、 Belgium, Denmark, Finland, fiance, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fur Normung Centrai Secretariat: rue d
16、e Stassart 36, B-1050 Brussels O 1995 All rights of reproduction and communication in any form and by any means reserved in ali countries to CEN and its members. Ref. No. EN IS0 9237 : 1995 E CEN EN*IS0*9237 95 3404589 0109824 934 m Page 2 EN IS0 9237 : 1995 Foreword The text of the International St
17、andard IS0 9237 : 1995 has been prepared by Technical Committee ISORy= 38, Textiles, in collaboration with CEN/rC 248, Textiles and textile products. It has been submitted to Parallel Vote and was approved on 19950505 as a European Standard. This European Standard sha be given the status of a nation
18、al standard, either by publication of an identical text or by endorsement, at the latest by December 1995, and conflicting national standards shall be withdrawn at the latest by December 1995. According to CENKENELEC Inted Regulations, the following countries are bound to implement this European Sta
19、n pressure drop: 100 Pa for apparel fabrics; pressure drop: 200 Pa for industrial fabrics. cases where these pressure drops cannot be achieved or are not appropriate, an alternative pres- sure drop of 50 Pa or 500 Pa may be used and/or an alternative test area of 5 cm2, 50 cm2 or 100 cm2 may be chos
20、en, if agreed between the interested parties. NOTE 4 For comparison of results it is recommended to perform the test with the same test area and pressure drop. 9 Test procedure NOTE 5 the test is given in annex A. Advice on checking calibration and conducting Mount the test specimen in the circular
21、specimen holder (7.1) with sufficient tension to eliminate wrin- kles, if any, taking care that the fabric is not distorted in its own plane. Avoid selvedges and areas with creases or folded places. For fabrics for which the air permeability may be different between the two faces of the fabric, spec
22、ify in the test report see 11 al211 which face was tested. Clamp specimens coated on one side with the coating towards the lower pressure side to prevent air leakage. Start the suction fan or other means (7.5) to force the air through the test specimen and adjust the flow of air gradually till a pre
23、ssure drop, as recommended above, is achieved across the test area of the fabric. Record the air flow (see 7.6) after at least 1 min or until steady conditions are achieved. NOTE 6 Some devices, e.g. volumetric counters, may need a volume of air flow of about 10 dm3 to assure the required accuracy.
24、Repeat the test at different locations on the sample at least 10 times under the same conditions. 10 Calculation and expression of results 10.1 Calculate the arithmetic mean of the individual readings and the coefficient of variation (to the near- est 0,l %), stating the 95 % confidence interval. 10
25、.2 Calculate the air permeability, R, expressed in millimetres per second, using the equation - 4v A R=-x 167 where qv is the arithmetic mean flowrate of air, in cubic decimetres per minute (litres per minute); is the area of fabric under test, in square centimetres; A 167 is the conversion factor f
26、rom cubic decimetres (or litres) per minute per square centimetre to millimetres per sec- ond. 10.3 For open fabrics and nonwovens, the air per- meability R may be expressed in metres per second using the equation - 4v A R=-x 0,167 where jv and A are as defined in 10.2. - CEN EN*IS0*9237 95 m 340458
27、9 0307827 643 m Page 5 EN IS0 9237 : 1995 10.4 Express the 95 % confidence interval in the units specified in 10.2 or 10.3, rounding the result R to 2 % of the value obtained in 10.2 or 10.3. 11 Test report The test report shall include the following information: a) general information: 1) the numbe
28、r and year of publication of this International Standard, .e. IS0 9237:1995, and the date of test; 2) all information necesSan/ for complete identi- fication of the sample tested and, if required, indication of the direction of air flow through the fabric; test surface area used, in square centimetr
29、es; pressure drop used, in pascals; number of specimens tested; the conditioning and testing atmospheres used; any deviation from the procedure specified. b) test results: 1) mean air permeability R. in millimetres per second or metres per second, as applicable; 2) coefficient of variation, in perce
30、nt; 3) 95 % confidence interval, in millimetres per second or metres per second, as applicable. CEN EN*IS0*9237 95 m 3404589 O109828 58T m Page 6 EN IS0 9237 : 1995 Annex A (inform at i ve) Advice on checking the calibration and conducting the test A.l Checking the apparatus and calibration It is ad
31、visable to check the calibration and the proper functioning of the apparatus weekly if in constant use, prior to testing if used infrequently, and after the ap paratus has been moved or repaired. The calibration of the apparatus should be checked periodically against a primary reference standard, at
32、 intervals of no greater than 12 months. The calibration of the pressure gauge (7.4) should also be checked periodically. A calibration check plate with test aperture of known air permeability at given pressure drop should be used for checking the calibration. Ensure the reproducibility of the exact
33、 position of the check plate in the circular specimen holder (7.1) to avoid any air leakage. Means for checking the calibration recommended for specific types of apparatus should be used in accord- ance with the specification of the apparatus and the required accuracy of the test. pressure gauge or
34、manometer (7.4); the air drawn through the guard ring should not pass through the flowmeter (7.6). The pressure drops across the test and the guard ring surfaces are equalized, so that no air can pass edgewise either to or from the test sur- faces. If the measuring device is not equipped with a guar
35、d ring, the rate of edge leakage can be determined by covering the sample with a rubber plate of the same size as the sample. Rubber plates 1 mm to 2 mm thick, having a hardness of 65 IRHD to 70 IRHD when tested in accordance with IS0 48, have been found to be suitable. A.2.2 Clamps on the fabric su
36、rface should be faced with a suitable grade of rubber (see 7.2). Gaskets 2.5 mm thick and having a hardness of 65 IRHD to 70 IRHD when tested in accordance with IS0 48 have been found to be suitable. A.2 Conducting the test A.2.3 Care should be taken when clamping the A.2.1 Edge leakage may be preve
37、nted by means specimen to ensure that it is not distorted or of an annular guard ring (7.3). The pressure drop stretched. acrosss the guard ring is measured by a separate - - CEN EN*ISO*237 95 3404589 0109827 4Lb = Page 7 EN IS0 9237 : 1995 Number of pieces in shipment or lot Annex B (informative) M
38、inimum number of pieces in bulk sample Suggested sampling procedure B.l Preparation of bulk sample (number B.2 Preparation of laboratory samples of pieces from a shipment or lot) To prepare the bulk sample, take at random from the shipment or lot at least the appropriate number of pieces shown in ta
39、ble B.1. Ensure that no piece that shows signs of damage or dampness incurred during transit is included in the bulk sample. From each piece comprising the bulk sample, cut (from a Position chosen at random but at least 3 m from an end of the Piece) a laboratory sample of length at least 1 m and Of
40、full width. Ensure that areas that are creased or that have a visible fault are not included in a laboratory sample. I I I 31 to 75 I 4 2 76 5 CEN EN*IS0*9237 95 3404589 0109830 138 Page 8 EN IS0 9237 : 1995 Annex ZA (normative) Nornative references to international publication with their relevant E
41、uropean publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed here Fax: O181 996 7048. Subscribing members of BSI are kept up to da
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