www bzfxw com BRITISH STANDARD BS EN 24920 1992 ISO 4920 1981 Incorporating Amendment No 1 Textiles — Determination of resistance to surface wetting (spray test) of fabrics The European Standard EN 24[.]
BRITISH STANDARD BS EN 24920:1992 ISO 4920:1981 Incorporating Amendment No Textiles — Determination of resistance to surface wetting (spray test) of fabrics The European Standard EN 24920:1992 has the status of a British Standard UDC 677.0741/076:677.017.63:620.1 BS EN 24920:1992 Cooperating organizations The Fibres, Yarns and Fabrics Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: Association of Jute Spinners and Manufacturers British Man-made Fibres Federation* British Nonwoven Manufacturers’ Association British Railways Board British Textile Employers’ Association* Central Council of the Irish Linen Industry Consumer Standards Advisory Committee of BSI Department of Industry (Chemicals and Textiles) Institute of Purchasing and Supply International Wool Secretariat* Knitting Industries Federation Ltd.* Manchester Chamber of Commerce and Industry Ministry of Defence* Narrow Fabrics Federation Textile Institute* Warp Knitters’ Association Ltd The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Confederation of British Wool Textiles Ltd Hollings College for the Food and Fashion Industries Manchester Chamber of Commerce Testing House and Laboratories Soap and Detergent Industry Association Society of Dyers and Colourists Society of Motor Manufacturers and Traders Ltd Textile Research Council This British Standard, having been prepared under the direction of the Fibres, Yarns and Fabrics Standards Committee, was published under the authority of the Board of BSI and comes into effect on 26 February 1982 © BSI 03-1999 First published January 1964 First revision The following BSI references relate to the work on this standard: Committee reference FBM/16 Draft for comment 79/36055 DC ISBN 580 12511 Amendments issued since publication Amd No Date of issue Comments 7004 November 1992 Indicated by a sideline in the margin BS EN 24920:1992 Contents Page Cooperating organizations Inside front cover National foreword ii Foreword Scope and field of application Reference 3 Definition Principle Apparatus and materials Conditioning and testing atmospheres Test specimens Procedure Test report Annex ISO photographic scale Figure — Apparatus for spray test Figure — Spray nozzle Figure — ISO spray test rating chart based on the AATCC photographic scale Publication referred to Inside back cover © BSI 03-1999 i BS EN 24920:1992 National foreword This revision of BS 3702 has been prepared under the direction of the Fibres, Yarns and Fabrics Standards Committee, and is identical with ISO 4920-1981 “Textile fabrics — Determination of resistance to surface wetting (Spray test)” published by the International Organization for Standardization (ISO) This British Standard supersedes BS 3702:1964, which is therefore now withdrawn In 1992 the European Committee for Standardization (CEN) accepted ISO 4920:1981 as European Standard EN 24920:1992 As a consequence of implementing the European Standard this British Standard is renumbered as BS EN 24920 and any reference to BS 3702 should be read as a reference to BS EN 24920 Terminology and conventions The text of the international standard has been approved as suitable for publication as a British Standard without deviation Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following The comma has been used throughout as a decimal marker In British Standards it is current practice to use a full point on the baseline as the decimal marker Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard” Cross-reference International standard Corresponding British Standard ISO 139-1973 BS EN 20139:1992 Textiles — Standard atmospheres for conditioning and testing (Identical) A British Standard does not purport to include all the necessary 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 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages to 6, an inside back cover and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover ii © BSI 03-1999 EUROPEAN STANDARD EN 24920 NORME EUROPÉENNE June 1992 EUROPÄISCHE NORM UDC 677.0741/076:677.017.63:620.1 Descriptors: Textiles, fabrics, tests, testing conditions, fluid-tightness tests, wetting, wettability, spraying English version Textiles — Determination of resistance to surface wetting (spray test) of fabrics Etoffes — Détermination de la résistance au mouillage superficiel (Essai d’arrosage) Textilien — Bestimmung der wasserabweisenden Eigenschaften (Sprühverfahren) ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ This European Standard was approved by CEN on 1992-06-26 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions 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 obtained on application to 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 translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1992 Copyright reserved to CEN members Ref No EN 24920:1992 E EN 24920:1992 Foreword This European Standard has been taken over by CEN/TC 248 “Textiles and textile products” from the work of ISO/TC 38 “Textiles” of the International Organization for Standardization (ISO) The document was submitted to the CEN members to the Unique Acceptance Procedure and was approved without any modification National standards identical to this European Standard shall be published at the latest by 1992-12-31 and conflicting national standards shall be withdrawn at the latest by 1992-12-31 Following the CEN/CENELEC Common Rules, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ © BSI 03-1999 EN 24920:1992 Scope and field of application This International Standard specifies a spray test method for determining the resistance of any fabric — which may or may not have been given a water-resistant or water-repellent finish — to surface wetting by water It is not intended for use in predicting the rain penetration resistance of fabrics, since it does not measure penetration of water through the fabric Reference 5.3 Specimen holder, consisting of two wood or metal rings, which fit into each other, one of 150 mm inside diameter and one of 150 mm outside diameter (for example an embroidery hoop), into which the specimen can be secured The rings should, when in position for a test, rest on a suitable support so that it is inclined at an angle of 45° with the centre of the test area 150 mm below the centre of the face of the spray nozzle 5.4 Distilled or fully deionized water, at 20 ± °C, or 27 ± °C ISO 139, Textiles — Standard atmospheres for conditioning and testing Conditioning and testing atmospheres Definition Conditioning and testing shall be carried out according to ISO 139 If so agreed, conditioning and testing may be carried out in the ambient atmosphere For the purposes of this International Standard, the following definition applies spray rating a measure of the resistance of the surface of a fabric to wetting Principle Test specimens Take at least three test specimens, 180 mm square, from different places in the fabric so that they represent the material as fully as possible Do not take test specimens from places with creases or fold marks ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ A specified volume of distilled or fully deionized water is sprayed on a test specimen which has been mounted on a ring and placed at an angle of 45° so that the centre of the specimen is at a specified distance below the spray nozzle The spray rating is determined by comparing the appearance of the specimen with descriptive standards and photographs Apparatus and materials 5.1 Spray device (see Figure 1), consisting of a 150 mm funnel held vertically, with a metal nozzle (5.2) connected to the end of the stem by rubber tubing of 10 mm bore The distance from the top of the funnel to the bottom of the nozzle is 190 mm 5.2 Metal nozzle1) (see Figure 2), having a convex face with 19 holes of 0,9 mm diameter (see Figure 2) The holes are distributed over the face of the nozzle The duration of flow for the specified volume of 250 ml of water poured into the funnel shall be between 25 and 30 s Procedure 8.1 Condition the test specimens for at least 24 h in the atmosphere defined in clause 8.2 After conditioning, mount the test specimen securely on the specimen holder (5.3) and place it with the face of the fabric uppermost on the hoop support Unless otherwise stated in the material specification, the specimen shall be orientated so that the warp direction is parallel to the flow of water down the specimen Pour 250 ml of water (5.4) into the funnel (see 5.1) quickly, but steadily so that the spraying shall be continuous once it has commenced Immediately the spray has ceased, remove the holder with its specimen and tap smartly twice against a solid object (on diametrically opposite points of the frame) During this operation, the plane of the fabric shall be almost horizontal, with the fabric face down After tapping, with the specimen still on the holder, assign to the specimen the rating in the following descriptive scale or in the photographic scale (see the Annex and Figure 3) which best describes the observed degree of wetting Make no attempt to assign intermediate ratings 1) Suitable metal nozzles are available commercially Details may be obtained from the ISO Central Secretariat or from the Secretariat of ISO/TC 38 © BSI 03-1999 EN 24920:1992 NOTE Photographic standards are not entirely satisfactory for dark-coloured fabrics and for such fabrics more reliance should be placed on verbal descriptions Spray rating: — Wetting of the whole of the sprayed surface — Wetting of half of the sprayed surface This usually occurs through the merging of small discrete wetting areas — Wetting of the sprayed surface only at small discrete areas — No wetting of, but adherence of small drops to, the sprayed surface — No wetting of, and no adherence of small drops to, the sprayed surface Test report The test report shall include the following information: a) reference to this International Standard; b) the atmosphere used (Standard temperate or Standard tropical or other atmosphere); c) the temperature of the water (20 or 27 °C or other temperature); d) the spray rating for each specimen tested ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Figure — Apparatus for spray test © BSI 03-1999 EN 24920:1992 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Figure — Spray nozzle © BSI 03-1999 EN 24920:1992 Annex ISO photographic scale (This annex forms part of the Standard.) The ISO descriptive rating scale corresponds to the AATCC photographic scale2) as follows: ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Figure — ISO spray test rating chart based on the AATCC photographic scale 2) The AATCC (American Association of Textile Chemists and Colorists) scale is available commercially Details may be obtained from the ISO Central Secretariat or from the Secretariat of ISO/TC 38 © BSI 03-1999 BS EN 24920:1992 Publication referred to See national foreword ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ © BSI 03-1999 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI Ð British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: 020 8996 9000 Fax: 020 8996 7400 BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services Tel: 020 8996 9001 Fax: 020 8996 7001 In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service Various BSI electronic information services are also available which give details on all its products and services Contact the Information Centre Tel: 020 8996 7111 Fax: 020 8996 7048 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Membership Administration Tel: 020 8996 7002 Fax: 020 8996 7001 Copyright Copyright subsists in all BSI publications BSI also holds the copyright, in the UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means ± electronic, photocopying, recording or otherwise ± without prior written permission from BSI This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained If permission is granted, the terms may include royalty payments or a licensing agreement Details and advice can be obtained from the Copyright Manager Tel: 020 8996 7070