Bsi bs en 24920 1992 (1999)

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 1

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

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 0 580 12511 4

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

Amendments issued since publication

Amd No Date of issue Comments

7004 November

1992 Indicated by a sideline in the margin

BS EN 24920:1992

© BSI 03-1999 i

Contents

Page

Figure 3 — ISO spray test rating chart based on the AATCC

ii © BSI 03-1999

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”

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.

Cross-reference

International standard Corresponding British Standard

ISO 139-1973 BS EN 20139:1992 Textiles — Standard atmospheres for

conditioning and testing (Identical)

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 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

EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 24920

June 1992

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)

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

© BSI 03-1999

2

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

EN 24920:1992

© BSI 03-1999 3

1 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

2 Reference

ISO 139, Textiles — Standard atmospheres for

conditioning and testing

3 Definition

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

4 Principle

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

5 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

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 ± 2 °C,

or 27 ± 2 °C

6 Conditioning and testing atmospheres

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

7 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

8 Procedure

8.1 Condition the test specimens for at least 24 h in

the atmosphere defined in clause 6.

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.

4 © BSI 03-1999

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:

1 — Wetting of the whole of the sprayed surface

2 — Wetting of half of the sprayed surface This

usually occurs through the merging of small

discrete wetting areas

3 — Wetting of the sprayed surface only at small

discrete areas

4 — No wetting of, but adherence of small drops

to, the sprayed surface

5 — No wetting of, and no adherence of small

drops to, the sprayed surface

9 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

Figure 1 — Apparatus for spray test

EN 24920:1992

© BSI 03-1999 5

Figure 2 — Spray nozzle

6 © BSI 03-1999

Annex ISO photographic scale

(This annex forms part of the Standard.)

The ISO descriptive rating scale corresponds to the AATCC photographic scale2) as follows:

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.

Figure 3 — ISO spray test rating chart based on the AATCC photographic scale

BS EN 24920:1992

© BSI 03-1999

Publication referred to

See national foreword

BSI

389 Chiswick High Road

London

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