1、BRITISH STANDARD BS7209:1990 Specification for Water vapour permeable apparel fabrics UDC 614.895:677.017.633.2-037:677.017.623:620.1:006.3/.8.BS7209:1990 This British Standard, having been prepared under the directionof the Textiles and Clothing Standards Policy Committee, was published underthe au
2、thority of the Board ofBSI and comes into effect on 31May 1990 BSI12-1998 The following BSI references relate to the work on this standard: Committee reference TCM/18 Draft for comment 87/44065 DC ISBN 0 580 17821 8 Committees responsible for this British Standard The preparation of this British Sta
3、ndard was entrusted by the Textiles and Clothing Standards Policy Committee (TCM/-) to Technical Committee TCM/18, upon which the following bodies were represented: Assistant Masters and Mistresses Association British Clothing Industry Association British Railways Board British Textile Employers Ass
4、ociation Confederation of British Wool Textiles Limited Department of Health Home Office International Wool Secretariat Local Authority Organizations Mail Order Traders Association Man-made Fibres Producers Committee Ministry of Defence National Association of Head Teachers National Childrens Wear A
5、ssociation Textile and Clothing Contractors Association Textile Research Council (FCRA) The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Marine Industries Federation British Plastics Federation Amendments issued since publication A
6、md. No. Date of issue CommentsBS7209:1990 BSI 12-1998 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Performance 1 4 Sampling, selection of test specimens and compliance 1 5 Marking 2 Appendix A Selection of test specimens 3 Appendix B Determination
7、 of water vapour permeability index 5 Appendix C Determination of resistance to water penetration after cleaning 9 Appendix D Determination of resistance to water penetration after abrasion 9 Appendix E Determination of resistance to water penetration after flexing 9 Appendix F Determination of surf
8、ace wetting after cleaning 9 Figure 1 Scheme for the selection of test specimens (not to scale) 4 Figure 2 Dish, support and cover ring 7 Figure 3 Turntable 8 Table 1 Physical properties 1 Table 2 Colour fastness 2 Table 3 Number and size of test specimens 3 Publications referred to Inside back cove
9、rBS7209:1990 ii BSI 12-1998 Foreword This British Standard has been prepared under the direction of the Textiles and Clothing Standards Policy Committee and specifies requirements for fabrics, suitable for the manufacture of water resistant clothing, which allow the permeation of water vapour. The f
10、abrics were initially considered by the British Mountaineering Council as suitable for outdoor pursuits but it is now considered that their use can be extended to other areas. The standard covers only the basic description of the fabrics and their construction and performance requirements. Purchasin
11、g authorities therefore may need to include additional information. Many properties cannot be specified objectively and cannot therefore be included in the specification, examples of such properties include colour, handle, appearance and details of additional design features. Public sector purchasin
12、g authorities may be able to supply standard patterns which cover these properties and serve to resolve any ambiguities of description. Appendix A gives a scheme for the selection of test specimens and Appendix B gives the method for the determination of water vapour permeability index. Appendix C,
13、Appendix D and Appendix E give methods for the determination of the resistance to water penetration after cleaning, abrasion and flexing respectively, and Appendix F gives a method for the determination of surface wetting after cleaning. A British Standard does not purport to include all the necessa
14、ry provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. In particular, attention is drawn to Statutory Instrument 1986 No. 26 Trade Descriptions, the Textile P
15、roducts (Indications of Fibre Content) Regulations 1986. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1to10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. Thi
16、s will be indicated in the amendment table on theinside front cover.BS7209:1990 BSI 12-1998 1 1 Scope This British Standard specifies requirements for two grades of fabric, which are suitable for the manufacture of water resistant clothing, and which allow the permeation of water vapour. NOTEThe tit
17、les of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this standard the definitions given in BS3546-1 and BS6189 apply together with the following. 2.1 batch a definite quantity of some commodity manufactured or produced under con
18、ditions which are presumed uniform 2.2 bulk the total number of rolls of fabric included in any part delivery 3 Performance 3.1 Physical requirements The fabrics shall comply with Table 1. 3.2 Colour fastness requirements 3.2.1 General. Except in the case of garments where fluorescent colours are sp
19、ecified, the fabrics shall comply with the requirements of Table 2. Colour fastness shall be tested on that surface of the fabric intended to be worn outermost, except that for colour fastness to rubbing, both surfaces of the fabric shall be tested. NOTEColour selection may be made by reference to t
20、he colours in BS381C. 3.2.2 Fluorescent colours. Where fluorescent colours are specified within the limits outlined in BS6629, the colour fastness requirements shall be in accordance with that British Standard. 4 Sampling, selection of test specimens and compliance 4.1 Sampling Sampling shall be car
21、ried out in such a manner that samples taken are representative of the manufacturing, processing, dyeing or finishing batch from which they are drawn and at a frequency of not less than one sample per kilometre of fabric. 4.2 Selection of test specimens NOTEUnless otherwise specified by the purchase
22、r, samples should be taken not nearer than20m from the beginning or end of a batch. The size of samples taken from each manufacturing batch shall be such that the aggregate size of the samples is sufficient to enable test specimens to be selected for the purposes of fulfilling the requirements in Ta
23、ble 1 and Table 2. Testspecimens shall be selected from the sample in accordance with Appendix A. In the case of multi-colour samples, all colours shall be represented by the specimens selected for colour fastness testing in accordance with Table 2. Table 1 Physical properties Fabric reference LA HA
24、 Method of test Water vapour permeability index (%) min. 50 80 Appendix B Resistance to water penetration (kPa) a a) as received min. 15 50 BS3424-26: method29A b b) after cleaning min. 10 35 Appendix C b c) after abrasion min. 10 35 Appendix D b d) after flexing min. 10 35 Appendix E b Cold crack t
25、emperature (C) max. 20 40 BS3424-8: method10A Surface wetting (spray rating) a) as received min. 4 4 BS3702 bc b) after cleaning min. 3 3 Appendix F bc a 1kPa=102mmH 2 O. b Applying the water to that surface of the fabric intended to be used outermost. c Using water conforming to grade3 of BS3978 at
26、 a temperature of20 2 C.BS7209:1990 2 BSI 12-1998 Table 2 Colour fastness 4.3 Compliance Samples shall be pre-conditioned for4h in a relative humidity not exceeding10% at a temperature not greater than50C before being exposed to the standard temperate atmosphere for the conditioning and testing of t
27、extiles defined in BS1051 for at least24h before testing. In the event of dispute, if any of the specimens tested do not comply with any requirement, the tests that the specimens have failed shall be repeated twice. For this purpose two further samples shall be taken from the same source as the orig
28、inal sample and the same number of test specimens as for the original test shall be taken from each sample so that duplicate tests may be conducted. If all the retest results are in accordance with the requirements given, the bulk of the fabric that the samples represent shall be deemed to comply wi
29、th the requirements of this standard. If any of the results of the retests do not comply with the requirements, the bulk of the fabric that the samples represented shall be deemed not to comply with the requirements of the standard. 5 Marking Each roll of fabric shall bear the following information,
30、 e.g. on a label or swing ticket: a) the name, trademark or other means of identification of the manufacturer and the manufacturing batch number; b) the number and date of this British Standard, i.e. BS7209:1990 1) ; c) the fabric reference; d) the fibre type of the basic fabric, e.g.polyamide; e) a
31、ny other marking as the contract or order may direct. Agency Minimum rating Test method Colour change Staining Light 5 BS1006-B02 Washing: BS1006-C06:B2S a colour change 4 5 staining of cotton 4 5 Dry cleaning BS1006-D01 colour change 4 5 discoloration of solvent 4 5 Rubbing 4 5 BS3424-14: method 16
32、 NOTEColour change assessments are to be carried out under the conditions specified in BS950. a Except where the fabric manufacturer recommends soap only for washing in which case the test method is BS1006-C02. 1) Marking BS7209:1990 on or in relation to a product represents a manufacturers declarat
33、ion of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third party certification of con
34、formity, which may also be desirable.BS7209:1990 BSI 12-1998 3 Appendix A Selection of test specimens Select test specimens in accordance with the scheme for selection of test specimens shown in Figure 1. NOTEFigure 1 gives a scheme for selection of test specimens for fabrics approximately1m wide. F
35、or other widths of fabric, the arrangement should be adjusted accordingly whilst still maintaining the shown symmetry of distribution of the test specimens. The numbers and sizes of test specimens shall be as shown in Table 3. Table 3 Number and size of test specimens Test Number of specimens Specim
36、en size Water vapour permeability as received 3 96mm diameter Resistance to water penetration a) as received 10 200mm diameter b) after cleaning 10 200mm diameter c) after abrasion 8 130mm to200mm diameter d) after flexing 10 220mm 190mm Cold cracking 3 32mm 6mm Surface wetting a) as received 3 180m
37、m 180mm b) after cleaning 3 180mm 180mmBS7209:1990 4 BSI 12-1998 NOTEThe letters and numbers shown in the figure indicate the following: a) letters B to F, to the Appendix B to Appendix F of this standard; b) 10 to BS3424-8: method 10A; c) 29to BS3424-26: method 29A; d) 3702 to BS3702. Figure 1 Sche
38、me for the selection of test specimens (not to scale)BS7209:1990 BSI 12-1998 5 Appendix B Determination of water vapour permeability index B.1 Principle A test specimen is sealed over the open mouth of a test dish which contains water, and the assembly placed in a controlled atmosphere. Following a
39、period to establish equilibrium of the water vapour pressure gradient across the sample, successive weighings of the assembled dish are made and the rate of water vapour permeation through the specimen is determined. The water vapour permeability index is calculated by expressing the water vapour pe
40、rmeability of the fabric as a percentage of the water vapour permeability of a reference woven fabric which is tested in a similar manner, concurrently and alongside the test specimen. NOTEThe method used is based on that commonly known as the Turl dish or control dish method which is used to measur
41、e the resistance of materials to water vapour diffusion and is particularly suitable for clothing materials. B.2 Apparatus B.2.1 Reference fabric 2) . A precision, high tenacity polyester woven monofilament mesh having the following characteristics: NOTEThis fabric is tightly woven and constructed f
42、rom synthetic fibres of low moisture regain to avoid sagging under conditions of high relative humidity. B.2.2 Test chamber. Room or cabinet controlled at the standard temperate atmosphere for testing textiles as defined in BS1051, i.e. a relative humidity of 65 2% and a temperature of20 2 C. The ch
43、amber is of sufficient size to contain the turntable assembly and test dishes and to maintain them within the specified limits of temperature and humidity. B.2.3 A cutting device, capable of cutting circular specimens with a diameter not less than the outer diameter of the dish. B.2.4 Burette, confo
44、rming to class B, or better, of BS846. B.2.5 Open dishes. Dishes fitted with cover rings, of the approximate dimensions shown in Figure 2 manufactured from a stable, lightweight, corrosion resistant material. The interior walls of the dishes are treated to reduce their wettability to ensure a unifor
45、m vertical gradient of water vapour pressure over the entire area of the dishes. NOTE 1Each dish and its corresponding cover ring should be numbered for identification purposes. NOTE 2In order to ensure accuracy in measuring water vapour loss, the dishes should be of low mass, e.g. manufactured from
46、 materials of low specific gravity. Aluminium alloy, e.g. material designation6082as specified in BS1474, has been found to be a satisfactory material for the dishes. Dishes with cover rings, constructed from aluminium alloy, assembled with specimens and containing water ready for testing, weigh120g
47、 to150g each. NOTE 3A baked-on silicone treatment has been found satisfactory for metal dishes. B.2.6 Sample support. A means of supporting the specimen in the dish, to prevent it from sagging, thereby altering the depth of the air layer between the specimen and the surface of the water. NOTEOne typ
48、e of support, shown in Figure 2, is constructed from stainless steel wire (0.0914mm diameter) and fits into three semi-circular depressions spaced120 apart and cut into the rim of the lid. The depth of the depressions is such that, with the support in place, the cover ring just fits onto the dish ri
49、m. B.2.7 Adhesive cement. A quick-drying adhesive cement for fixing test fabrics to the rim of the test dishes. NOTEThe adhesive or its solvents should not react with or irreversibly alter any part of the test fabric. A general-purpose, clear PVC/nitrile contact adhesive has been found satisfactory for this purpose. B.2.8 Adhesive tape. Pressure sensitive, adhesive-backed polymer tape with negligible water vapour transmission properties for sealing the cover rings to the test dishes. NOTEPVC electrical insulatin
