BS 1344-22-1994 Methods of testing vitreous enamel finishes - Determination of resistance to thermal shock of coatings for fabricated sheet steel components such as burners and pan.pdf

1、BRITISH STANDARD BS 1344-22: 1994 Methods of testing Vitreous enamel finishes Part 22: Determination of resistance to thermal shock of coatings for fabricated sheet steel components such as burners and pan supports for cookersBS1344-22:1994 This British Standard, having been prepared under the direc

2、tion of the Surface Treatments and Coatings Standards Policy Committee, waspublished under the authority of the Standards Board and comes into effect on 15 December 1994 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference STC/36 Draft for comment 93/5076

3、14 DC ISBN 0 580 23379 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Surface Treatments and Coatings Standards Policy Committee (STC/-) to Technical Committee STC/36, upon which the following bodies were represented: Agricultural Eng

4、ineers Association Association of Manufacturers of Domestic Electrical Appliances British Steel plc Institute of Vitreous Enamellers Metal Sink Manufacturers Association Vitreous Enamel Development Council Amendments issued since publication Amd. No. Date CommentsBS1344-22:1994 BSI 07-1999 i Content

5、s Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Informative references 1 3 Definitions 1 4 Principle 1 5 Apparatus 1 6 Test specimens 1 7 Procedure 1 8 Expression of results 2 9 Test report 2 List of references Inside back coverBS1344-22:1994 ii BSI 07-1999 Foreword This Par

6、t of BS 1344 was prepared under the direction of the Surface Treatments and Coatings Standards Policy Committee. This test is suitable only for testing fabricated sheet steel components such as burners and pan supports on cookers. Further Parts of BS 1344 specifying methods of test for other propert

7、ies of vitreous enamels, are in preparation. The standard at present includes the following other Parts. Part 1: Determination of resistance to thermal shock of coatings on articles other than cooking utensils and fabricated sheet steel components; Part 2: Resistance to citric acid at room temperatu

8、re; Part 3: Determination of resistance to sulphuric acid at room temperature; Part 4: Resistance to abrasion; Part 5: Determination of resistance to hot detergent solutions used for washing textiles; Part 6: Resistance to alkali; Part 7: Determination of resistance to heat; Part 8: Determination of

9、 resistance to boiling citric acid; Part 9: Determination of resistance to boiling water and water vapour; Part 10: Determination of resistance to condensing hydrochloric acid vapour; Part 11: High voltage test for articles for use under highly corrosive conditions; Part 12: Production of specimens

10、for testing coatings on sheet steel; Part 13: Production of specimens for testing coatings on cast iron; Part 14: Apparatus for testing with acid and neutral liquids and their vapours; Part 15: Apparatus for testing with alkaline liquids; Part 16: Resistance to thermal shock of coatings on cooking u

11、tensils; Part 17: Resistance to hot sodium hydroxide solution; Part 18: Determination of fluidity behaviour: fusion flow test; Part 19: Apparatus for determination of resistance to hot detergent solutions used for washing textiles; Part 20: Low voltage test for detecting and locating defects; Part 2

12、1: Determination of the resistance of vitreous enamelled articles to impact: pistol test. 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 o

13、f itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and2, 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

14、 indicated in the amendment table on the inside front cover.BS1344-22:1994 BSI 07-1999 1 1 Scope This Part of BS 1344 describes a method of test for determining the resistance to sudden changes in temperature (thermal shock) of vitreous enamel finishes on fabricated sheet steel components, that are

15、near to, or likely to be affected by, a source of heat. It is not applicable to cooking utensils which are covered in BS 1344-16:1975, or to cast iron components which are covered in BS 1344-1:1994. 2 Informative references This Part of BS 1344 refers to other publications that provide information o

16、r guidance. Editions of these publications current at the time of issue are listed on the inside back cover, but reference should be made to the latest editions. 3 Definitions For the purposes of this Part of BS 1344 the following definitions apply. 3.1 vitreous enamel a substance resulting from sme

17、lting or fritting of inorganic compounds to form a vitreous material fused or capable of being fused, in one or more layers, on to a metallic or other suitable base 3.2 thermal shock cycle the series of operations consisting of heating a test specimen to the agreed test temperature and quenching an

18、agreed test area with water at a temperature of between 15 C and 25 C 3.3 test temperature the agreed temperature to which the specimen is heated before being quenched with water, which is50 C above the operating temperature when fitted to an appliance up to a maximum of 470 C, inclusive 3.4 damage

19、any chipping or tension cracks in the enamel visible at a distance of 250 mm by normal sight 4 Principle The surface of a component or part of a component of a vitreous enamelled appliance is subjected to a series of thermal shock tests. In each test, it is heated, by either direct or radiant heat d

20、epending on the heat source on the assembled appliance, to an agreed temperature above 200 C and then it is immediately quenched in water at 15 C to 25 C. 5 Apparatus 5.1 Heat source or sources, capable of heating the test specimen at the specified or agreed part of the test specimen to the agreed t

21、emperatures, the source either providing direct heat or radiant heat as required. 5.2 Surface pyrometer, capable of measuring to an accuracy of 2 C. 5.3 Thermometer, to measure the temperature of the water. 6 Test specimens 6.1 Test specimens shall be unmodified enamelled sheets or cast iron compone

22、nts. NOTECooking stove components of cast iron construction should be tested in accordance with the method described inBS1344-1:1994. 6.2 The specimens shall be representative of the entire consignment and the method of sampling shall be agreed between the parties to the test. 7 Procedure 7.1 The ar

23、ea to be tested, and whether the whole or an agreed part of the test specimen is to be tested, either shall be determined in accordance with the applicable British Standard or other specification, or shall be agreed between the parties. 7.2 Using either a direct or radiant heat source, or both, acco

24、rding to the heat source employed in the intended end use and by agreement between the parties, heat the area to be tested (see 7.1) to the test temperature 5%. The test temperature shall be at least 200 C and either shall be determined in accordance with the applicable British Standard or other spe

25、cification, or shall be agreed between the parties. 7.3 Remove the test specimen from the heat source and, within 5 s, plunge it into water, at between15 C and 25 C, so that the highest point of the test specimen is at least 50 mm below the surface of the water. Maintain the test specimen in this po

26、sition for at least 30 s. 7.4 Dry the test specimen and allow it to cool to ambient temperature; inspect it for any damage. 7.5 Repeat the procedure described in 7.2 to 7.4 so that three thermal shock cycles are completed.BS1344-22:1994 2 BSI 07-1999 8 Expression of results If there is no visible da

27、mage to the enamel surface after being subjected to the test, the vitreous enamel surface shall be reported to be resistant to thermal shock at the specified temperature and number of cycles. 9 Test report The test report shall include the following: a) a description of the specimen (e.g. shape, thi

28、ckness of enamel, volume, mass, labelling); b) the method of sampling; c) the number of test specimens; d) the test temperature; e) whether a direct or radiant heat source (or both) has been used; f) the water temperature and the location of the test area on the test specimen; g) whether or not the

29、test specimen is resistant to thermal shock at the specified temperature; h) if appropriate, a description of the damage and after which cycle it appeared.BS1344-22:1994 BSI 07-1999 List of references (see clause 2) Informative references BSI publications BRITISH STANDARDS INSTITUTION, London BS 134

30、4, Methods of testing vitreous enamel finishes. BS 1344-1:1994, Determination of resistance to thermal shock of coatings on articles other than cooking utensils and fabricated sheet steel components. BS 1344-16:1975, Resistance to thermal shock of coatings on cooking utensils. BS1344-22: 1994 BSI 38

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