BS-EN-13258-2003.pdf
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1、BRITISH STANDARD BS EN 13258:2003 Materials and articles in contact with foodstuffs Test methods for crazing resistance of ceramic articles The European Standard EN 13258:2003 has the status of a British Standard ICS 67.250; 97.040.60 ? BS EN 13258:2003 This British Standard was published under the
2、authority of the Standards Policy and Strategy Committee on 14 March 2003 BSI 14 March 2003 ISBN 0 580 41408 6 National foreword This British Standard is the official English language version of EN 13258:2003. It supersedes DD ENV 13258:1999 which is withdrawn. The UK participation in its preparatio
3、n was entrusted to Technical Committee CW/29, Tableware, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in th
4、is document may be found in the BSI Catalogue under the section entitled “International 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 co
5、ntract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals
6、 for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 10, an inside back cover and a back cover. The BSI copy
7、right date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13258 March 2003 ICS 67.250; 97.040.60 English version Materials and articles in contact with foodstuffs -
8、 Test methods for crazing resistance of ceramic articles Matriaux et articles en contact avec les denres alimentaires - Mthodes dessai de la rsistance au tressaillage des articles en cramique Werkstoffe und Gegenstnde in Kontakt mit Lebensmitteln - Prfverfahren fr die Haarrissbestndigkeit keramische
9、r Gegenstnde This European Standard was approved by CEN on 21 November 2002. 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 bibli
10、ographical references concerning such national standards may be obtained on application to the Management Centre 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
11、 CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Net
12、herlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2003 CENAll rights of exploitation in any form and b
13、y any means reserved worldwide for CEN national Members. Ref. No. EN 13258:2003 E EN 13258:2003 (E) 2 Contents page Foreword3 1Scope 4 2Terms and definitions4 3Principles4 4Apparatus .4 5Samples 5 6Procedure .5 7Expression of results 6 8Test report 7 Annex A (informative) Calculation of a Crazing Re
14、sistance Index from data obtained by method A.8 Annex B (informative) Calculation of a Crazing Resistance Index from data obtained by Method B.10 EN 13258:2003 (E) 3 Foreword This document (EN 13258:2003) has been prepared by Technical Committee CEN/TC 194 “Utensils in contact with food”, the secret
15、ariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2003, and conflicting national standards shall be withdrawn at the latest by September 2003. This document
16、supersedes ENV 13258:1998. Annexes A and B are informative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, H
17、ungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland and the United Kingdom. EN 13258:2003 (E) 4 1 Scope This European Standard specifies two test methods (methods A and B) for the determination of crazing resistance of glazed
18、 ceramic tableware articles in contact with food with water absorption higher than 0,5 % (determined according to method C of EN 1217:1997). Method A is a test for resistance to crazing due to moisture expansion. Method B is a test for resistance to crazing due to thermal shock and is similar in mos
19、t respects to EN 1183:1997. 2 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 2.1 crazing formation of very fine cracks in the glaze caused by either moisture expansion of the body or thermal stress which creates sufficient tension in the
20、glaze to cause it to craze 2.2 moisture expansion expansion of ceramic bodies with high water absorption due to penetration of water vapour through imperfections in the glaze 2.3 thermal shock sudden change in temperature 3 Principles 3.1 Method A The samples are subjected to saturated steam at a de
21、fined pressure for a number of cycles in an autoclave to test resistance to crazing due to moisture expansion. The steam pressure is increased and reduced slowly in order to minimize thermal shock. The samples are examined for crazing after each cycle. A stain is applied to the surface to aid in the
22、 detection of crazing cracks. 3.2 Method B Samples are heated in a test oven and then cooled rapidly in a cold water bath under controlled conditions in order to subject the articles to thermal shock. Thermal shock tests are repeated using increasing temperature differences. The samples are examined
23、 for crazing after each thermal shock test. The water in the cold water bath is stained to aid in the detection of crazing cracks. 4 Apparatus NOTEItems 4.1, 4.2 and 4.3 are required for method A and items 4.4, 4.5, 4.6, 4.7 and 4.8 are required for method B. 4.1Autoclave of sufficient volume to con
24、tain several samples, built for a steam pressure of at least 500 kPa. The steam may be provided by either external or internal heating of the autoclave or from a separate steam generator. The autoclave shall be equipped with: a pressure gauge; a safety valve; a means to reduce pressure within the au
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