1、BRITISH STANDARD BS 3424-12: 1996 ISO 1419:1995 Incorporating Amendments Nos. 1 and 2 Testing coated fabrics Part 12: Accelerated ageing tests ICS 59.080.40 Copyright British Standards Institution Provided by IHS under license with BSI Not for Resale No reproduction or networking permitted without l
2、icense from IHS - - -BS 3424-12:1996 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 effect on 15 May 1996 BSI 18 September 2002 First published May 1990 Second ed
3、ition May 1996 The following BSI references relate to the work on this standard: Committee reference PRI/78 Draft for comment 92/41757 DC ISBN 0 580 25618 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/78, Coated f
4、abrics, upon which the following bodies were represented: The British Apparel and Textile Confederation British Plastics Federation British Railways Board British Rubber Manufacturers Association British Textile Technology Group Department of Health Department of the Environment (Building Research E
5、stablishment) Furniture Industry Research Association Rapra Technology Ltd. Home Office Made-Up Textile Association SATRA Footwear Technology Centre Safety Equipment Association Society of Motor Manufacturers and Traders Ltd. Amendments issued since publication Amd. No. Date Comments 10276 November
6、1998 National foreword amended 13927 18 September 2002 See national foreword Copyright British Standards Institution Provided by IHS under license with BSI Not for Resale No reproduction or networking permitted without license from IHS - - -BS 3424-12:1996 BSI 18 September 2002 i Contents Page Commi
7、ttees responsible Inside front cover National foreword ii Introduction 1 1S c o p e 1 2 Normative references 1 3 Clause deleted 1 4 Clause deleted 1 5 Clause deleted 1 6 Method D: Ageing test for nitrocellulose-type coatings 2 Copyright British Standards Institution Provided by IHS under license wit
8、h BSI Not for Resale No reproduction or networking permitted without license from IHS - - -BS 3424-12:1996 ii BSI 18 September 2002 National foreword This Part of BS 3424 has been prepared by Technical Committee PRI/78, and is derived from ISO 1419:1995, Rubber or plastics coated fabrics Accelerated
9、-ageing tests, published by the International Organization for Standardization (ISO). It is a revision of BS 3424-12:1990, which is withdrawn. Attention is drawn to the additional information. The start and finish of text introduced or altered by amendment is indicated in the text by tags . For exam
10、ple, text altered by Amendment No. 1 is indicated by . Methods A and B in this Part of BS 3424 have been superseded by BS EN 12280-1:1998, Rubber- or plastics-coated fabrics Accelerated ageing tests Heat ageing, which specifies three methods (method 1, oven method; method 2, volatile loss method; me
11、thod 3, activated carbon method). Method C in this Part of BS 3424 has been superseded by BS EN 12280-3:2002, Rubber- or plastics-coated fabrics Accelerated ageing tests Environmental ageing. However, this Part of BS 3424 remains current because Method D is still relevant. Additional information In
12、the UK it is common practice to employ a conditioning atmosphere conforming to atmosphere A of BS 3424-2:1992 (ISO 2231). Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “Inter
13、national Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. 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
14、itish 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, pages 1 and 2, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the docume
15、nt was last issued. Copyright British Standards Institution Provided by IHS under license with BSI Not for Resale No reproduction or networking permitted without license from IHS - - -BS 3424-12:1996 BSI 18 September 2002 1 Introduction The ageing of coated fabrics consists in subjecting test pieces
16、, with previously determined physical properties, to a controlled deteriorating influence for a known period. The selection of the most appropriate test method(s), ageing time and temperature will depend on the purpose of the test and the type of coated fabric. The physical properties used to measur
17、e the deterioration of coated fabrics may be strength properties, flexing, blocking or any other desired physical or chemical property. By selection of appropriate methods of test, the physical properties can be investigated. WARNING Persons using this International Standard should be familiar with
18、normal laboratory practice. This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Scope This
19、International Standard describes four methods of assessing the resistance of coated fabrics to deterioration by accelerated ageing. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the ti
20、me of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO main
21、tain registers of currently valid International Standards. ISO 2231:1989, Rubber- or plastics-coated fabrics Standard atmospheres for conditioning and testing. ISO 2286:1986, Rubber- or plastics-coated fabrics Determination of roll characteristics. 3 Clause deleted 4 Clause deleted 5 Clause deleted
22、Copyright British Standards Institution Provided by IHS under license with BSI Not for Resale No reproduction or networking permitted without license from IHSBS 3424-12:1996 2 BSI 18 September 2002 6 Method D: Ageing test for nitrocellulose-type coatings 6.1 General In a similar way to PVC-coated fa
23、brics, nitrocellulose-coated fabrics may lose plasticizer by volatilization, and in time this will have an adverse effect on the flexibility of the coating. This is particularly relevant in book-binding, which is the main end-use for this type of product, where long-term flexibility at the hinge is
24、required. This test attempts to simulate and accelerate this situation, and hence the end-point is based on visual inspection rather than mass loss. 6.2 Apparatus 6.2.1 Three test-tubes, measuring 150 mm 25 mm. 6.2.2 Three clean corks, to fit the tubes. 6.2.3 Air oven, in which there is a slow circu
25、lation of air, providing not less than three and not more than ten air changes per hour, equipped with a suitable means of controlling and measuring the rate of air flow. Means shall be provided for maintaining the oven at the required temperature and, if necessary, the required relative humidity, a
26、nd for the introduction of temperature-measuring and, if necessary, humidity-measuring instruments at a suitable position for measuring the operating conditions. The incoming air shall be at the temperature specified before coming into contact with the test pieces. Any electric elements used for hea
27、ting the incoming air shall be shielded to avoid direct radiation on to the test pieces. No copper or copper alloy shall be within the ageing chamber of the oven. The oven shall be of such a size that the total volume of the test pieces does not exceed 10 % of the free air space in the oven. Means s
28、hall be provided for suspending the test pieces vertically within the oven so that they are not within 10 mm of each other nor within 50 mm of the inner surfaces of the oven. The temperature of the oven shall be maintained at 70 C1 C. 6.3 Preparation of test pieces Cut three test pieces, each measur
29、ing 150 mm 75 mm, selected so that, as far as possible, they are evenly spaced across the sample, but not within 50 mm of a selvedge, and with their length in the longitudinal or transverse direction. 6.4 Procedure Roll up each test piece along its length with the coating outermost and insert into a
30、 150 mm 25 mm test-tube. Place a clean fresh cork lightly into the mouth of each test-tube and place the assembly in the oven, maintained at 70 C1 C. After 168 h (7 days) at this temperature, remove the test-tubes from the oven, take out the test pieces and condition them in atmosphere A, B or C as
31、defined in ISO 2231:1989. While still in the standard atmosphere, fold each test piece sharply along its length between the fingers, with the coating outermost. Examine the test piece and record any cracks in the coating. 6.5 Test report The test report shall include the following information: a) a
32、reference to this International Standard and to the method used (method D); b) all details necessary for the identification of the coated fabric tested; c) the conditioning atmosphere used; d) whether any cracks were observed in the coating; e) details of any deviation from the test procedure specif
33、ied. Copyright British Standards Institution Provided by IHS under license with BSI Not for Resale No reproduction or networking permitted without license from IHSblank Copyright British Standards Institution Provided by IHS under license with BSI Not for Resale No reproduction or networking permitt
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