1、BRITISH STANDARD BS 1344-7: 1984 ISO 4530: 1983 Methods of testing Vitreous enamel finishes Part 7: Determination of resistance to heat ISO title: Vitreous and porcelain enamelled manufactured articles Determination of resistance to heat UDC 666.293:620.193.94:536.495BS1344-7:1984 This British Stand
2、ard, having been prepared under the directionof the Surface Coatings (other than Paints) Standards Committee, was published under the authority ofthe Board of BSI and comes intoeffect on 31 October 1984 BSI 07-1999 First published April 1947 First revision July 1967 Second revision The following BSI
3、 references relate to the work on this standard: Committee reference SRC/7 Draft for comment 79/53276 DC ISBN 0 580 14159 4 Committees responsible for this standard The preparation of this British Standard was entrusted by the Surface Coatings (other than Paints) Standards Committee (SRC/-) to Techn
4、ical Committee SRC/7 upon which the following bodies were represented: Association of Manufacturers of Domestic Electrical Appliances Bcira British Bath Manufacturers Association British Gas Corporation Consumer Standards Advisory Committee of BSI Electricity Supply Industry in England and Wales Ins
5、titute of Vitreous Enamellers Metal Sink Manufacturers Association Society of British Gas Industries Vitreous Enamel Development Council Coopted members Amendments issued since publication Amd. No. Date of issue CommentsBS1344-7:1984 BSI 07-1999 i Contents Page Committees responsible Inside front co
6、ver National foreword ii 0 Introduction 1 1 Scope and field of application 1 2 Principle 1 3 Apparatus 1 4 Sampling 1 5 Procedure 1 6 Test report 1BS1344-7:1984 ii BSI 07-1999 National foreword This revision of this Part of this British Standard, prepared under the direction of the Surface Coatings
7、(other than Paints) Standards Committee, is identical with ISO4530:1983 “Vitreous and porcelain enamelled manufactured articles Determination of resistance to heat”. ISO4530 was prepared by Technical Committee TC107, Metallic and other non-organic coatings, of the International Organization for Stan
8、dardization (ISO), with the active participation and approval of the UK. This revision supersedes BS1344-7:1967 which is withdrawn. It differs from the1967 publication in that provision is made, where appropriate, for a) maintaining the test temperature of the article under test at the specified tem
9、perature for an agreed time; b) subjecting the article under test to an agreed number of test cycles. NOTEThe 1967 edition, which was of national origin, specified one test cycle in which heating of the article under test was discontinued immediately on attaining the test temperature. Further Parts
10、of this standard, specifying methods of test for other properties of vitreous enamels, are in course of preparation. The standard at present includes the following Parts either published or in course of preparation. Part 1: Resistance to thermal shock of coatings on articles other than cooking utens
11、ils; Part 2: Resistance to citric acid at room temperature; Part 3: Resistance to products of combustion containing sulphur compounds; 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: Deter
12、mination of resistance to heat; Part 8: Determination of resistance to boiling citric acid; Part 9: Resistance to boiling water and water vapour; Part 10: Resistance to boiling hydrochloric acid; Part 11: High voltage test for articles for use under highly corrosive conditions; Part 12: Production o
13、f specimens 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
14、on cooking utensils; 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. Terminology and conventions. The text of the internation
15、al 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 drawn especially to the following. Where the words “International Standard” appear, referri
16、ng to this standard, they should, be read as “British Standard”. Additional information. This Part of BS1344 describes a method of test only and should not be used or quoted as a specification defining resistance to heat. Reference to this Part should indicate that the method of test used is in acco
17、rdance with BS1344-7.BS1344-7:1984 BSI 07-1999 iii 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 obl
18、igations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, page 1 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.iv bl
19、ankBS1344-7:1984 BSI 07-1999 1 0 Introduction The method of test specified requires to be completed, for any particular application, by the following supplementary information. This information shall be derived from the International Standard or national standard or other document relating to the vi
20、treous and porcelain manufactured articles under test or, if appropriate, shall be the subject of agreement between the interested parties: a) test temperature; b) type of heating (direct and/or radiant); c) temperature measuring points; d) rate of temperature increase; e) duration of maintaining th
21、e test temperature; f) number of single heating and cooling tests; g) what kind of damage to the vitreous and porcelain enamel finishes are to be considered in evaluating the resistance of the vitreous and porcelain enamelled manufactured articles to heat. 1 Scope and field of application This Inter
22、national Standard lays down basic conditions concerning the method for determining the resistance of vitreous and porcelain enamelled manufactured articles to heat. The method is applicable to vitreous and porcelain enamelled manufactured articles that will, in service, be subjected to high temperat
23、ure, for example to some cooker components, exhaust pipe silencers, gas heating chimneys. 2 Principle Submission of an article to a series of single heating and cooling tests in which it is heated to an agreed surface temperature and then, after a period of maintaining this temperature, allowed to c
24、ool to room temperature. Examination of the article for any defects caused by heating. 3 Apparatus 3.1 Heat source, suitable for direct or radiant heating of the article to the test temperature. 3.2 Surface contact pyrometer, accurate to 2 C. 3.3 Stop-watch. 4 Sampling 4.1 The articles to be tested
25、shall be used as specimens without any modification. 4.2 The specimens shall be representative of the entire consignment. The method of sampling shall be agreed upon between the interested parties. 5 Procedure 5.1 Heat the article under normal service conditions either by direct and/or radiant heat
26、to the agreed test temperature 5 C. The agreed test temperature should be50 C above the highest temperature which the article will encounter in service. The rate of heating should be such that the temperature of the vitreous and porcelain enamelled surfaces rises at a uniform agreed rate, for exampl
27、e between30 and40 C/min. Measure the temperature at the agreed measuring points by means of a suitable surface contact pyrometer. 5.2 As soon as the required test temperature has been attained, maintain the article at this temperature for the agreed duration. Then remove the heat source and allow th
28、e article to cool under normal service conditions to ambient temperature. 5.3 Examine the article and note the occurrence of any cracking, flaking or blistering. 5.4 If no damage occurs, repeat the heating and cooling treatment until damage occurs or the agreed number of single heating and cooling t
29、ests has been carried out. 6 Test report The test report shall include the following information: a) reference to this International Standard; b) the description and identification of the articles tested; c) method of sampling; d) number of articles tested; e) type of heat source used (direct or rad
30、iant); f) the type of surface contact pyrometer; g) the kind of thermal distribution and temperature measuring points used; h) the test temperature; j) the duration of maintaining test temperature; k) the number of single heating and cooling tests applied; m) whether damage occurred; n) a descriptio
31、n of damage to the vitreous and porcelain enamel finishes, if any, and a photograph, if necessary.BS 1344-7: 1984 ISO 4530: 1983 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK
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