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1、BRITISH STANDARD BS 1344-6: 1971 Incorporating Amendment No. 1 Methods of testing vitreous enamel finishes Part 6: Resistance to alkali Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:19:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1344-6:1971 This British Standard, having been approve
2、d by the Surface Coatings (other than Paints) Industry Standards Committee, was published under the authority of the Executive Board on 31 August 1971 BSI 07-1999 First published (as Part 1, Section 2) April, 1947 First revision (as Part 6) August, 1971 The following BSI references relate to the wor
3、k on this standard: Committee references SRE/7, SRE/7/1 Draft for approval 70/23586 ISBN 580 06543 X Co-operating organizations The Surface Coatings (other than Paints) Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the foll
4、owing Government departments and scientific and industrial organizations: Aluminium Federation Assay Offices Committee of Great Britain Association of Metal Sprayers British Bolt, Nut, Screw and Rivet Federation British Electrical and Allied Manufacturers Association British Jewellers Association Br
5、itish Non-ferrous Metals Research Association British Steel Industry Chemical Industries Association Cycle and Motor Cycle Association Limited Electricity Council, the Central Electricity Generating Board and Area Boards in England and Wales Electronic Engineering Association Engineering Equipment U
6、sers Association Greater London Council Institute of Metal Finishing Institute of Sheet Metal Engineers Institute of Vitreous Enamellers* Metal Finishing Association Ministry of Defence, Army Department Ministry of Defence, Navy Department Ministry of Technology Society of Motor Manufacturers and Tr
7、aders Limited Tin Research Institute Vitreous Enamel Development Council* Zinc Development Association The scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this
8、 British Standard: Association of Manufacturers of Domestic Electrical Appliances British Bath Manufacturers Association British Refrigeration and Air Conditioning Association Gas Council Institution of Gas Engineers Metal Sink Manufacturers Association National Federation of Ironmongers Society of
9、British Gas Industries Wrought Holloware Trade Employers Federation Amendments issued since publication Amd. No. Date of issue Comments 3271 April 1980 Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:19:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
10、1344-6:1971 BSI 07-1999i Contents Page Co-operating organizationsInside front cover Forewordii 1Scope1 2Definition1 3Test specimen1 4Apparatus1 5Testing solution1 6Procedure1 7Test report1 Figure 1 Glass tube1 Figure 2 Test assembly2 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:19:37 GM
11、T+00:00 2006, Uncontrolled Copy, (c) BSI BS 1344-6:1971 ii BSI 07-1999 Foreword This Part of BS 1344, prepared under the authority of the Surface Coatings (other than Paints) Industry Standards Committee, supersedes BS 1344-1.2:1947, “Alkali resistance”. The changes involved are only of an editorial
12、 and metrication nature and therefore no draft was circulated to industry for comment. An alkali test is frequently called for in relation to baths, wash-boilers, sinks and similar domestic equipment. For the determination of alkali resistance a 5 % solution of sodium carbonate has been specified fo
13、r general purposes. For special purposes, other types and strengths of alkali may be used, as for example a 10 % solution of sodium hydroxide when a more stringent test is desired. In such cases, however, the type and strength of the alkali should always be specified. The publication of this Part co
14、mpletes the revision of BS 1344:1947, and the standard now consists of the following parts: Part 1: Resistance to thermal shock; Part 2: Resistance to culinary acids; Part 3: Resistance to products of combustion; Part 4: Resistance to abrasion; Part 5: Resistance to detergents; Part 6: Resistance to
15、 alkali; Part 7: Resistance to heat. 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. Summ
16、ary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2 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. Licensed C
17、opy: sheffieldun sheffieldun, na, Fri Nov 24 06:19:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1344-6:1971 BSI 07-19991 1 Scope This Part of BS 1344 gives a method of test for determining the resistance of vitreous enamel finishes to alkali. 2 Definition For the purposes of this British Standar
18、d the following definition applies: Vitreous enamel. A glazed surface finish produced by the application of a powdered inorganic glass, dry or suspended in water, to metal parts, and its subsequent fusion. 3 Test specimen The test specimen shall be a component part of a vitreous enamelled appliance.
19、 4 Apparatus The following apparatus is required: 1) A glass tube 100 mm long and 63 mm diameter, with both ends flanged (see Figure 1 and Figure 2). 2) A small immersion heater (see Figure 2). 5 Testing solution The reagent used shall be a 5 % solution of sodium carbonate made by dissolving 10 g of
20、 analytical reagent quality anhydrous sodium carbonate (Na2CO3) in distilled water and making up to 200 ml. NOTEThis solution of sodium carbonate has been chosen as providing the best standard for the determination of alkali resistance for general purposes. For special purposes, other types and stre
21、ngths of alkali may be used e.g. a 10 % solution of sodium hydroxide may be used for a more stringent test. In such cases, however, it is essential to specify the type and strength of alkali used. 6 Procedure Clean the surface to be tested with acetone or aqueous ammonia followed by hot water and th
22、en ensure that it is thoroughly dry. Lute the glass tube on to the surface to be tested with a suitable plastic cement1). Introduce 200 ml of sodium carbonate solution into the tube and insert the heater. Heat the solution to 80 C and maintain at 80 5 C for 20 min, the solution being stirred continu
23、ously. After this time, empty the solution out of the tube and thoroughly wash the surface with water. Remove the tube and dry the surface. A fresh solution shall be used for each test. Rub a small quantity of colloidal graphite2) or manganese dioxide on to the dry enamel surface with a clean soft c
24、loth, chamois leather or velvet. Examine the part of the surface which has been treated with alkali under good lighting conditions. For black or dark coloured enamels, use titanium oxide instead of graphite or manganese oxide. 7 Test report The test report shall include a description of the differen
25、ce in appearance, if any, between the treated and untreated parts of the test specimen. 1) Prestik sealing strip 5603, obtainable from Bostik Ltd., Ulverscroft Road, Leicester, is a suitable material. 2) Acheson colloidal graphite is a suitable material. Figure 1 Glass tube Licensed Copy: sheffieldu
26、n sheffieldun, na, Fri Nov 24 06:19:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1344-6:1971 2 BSI 07-1999 Figure 2 Test assembly Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:19:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 2
27、4 06:19:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1344-6: 1971 BSI 389 Chiswick High Road London W4 4AL BSI 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 l
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35、n 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. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:19:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI