Materials and articles in contact with foodstuffs - Test methods for crazing resistance of ceramic articles

This European Standard specifies two test methods (methods A and B) for the determination of crazing resistance of glazed 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 most respects to EN 1183: 1997.

Werkstoffe und Gegenstände in Kontakt mit Lebensmitteln - Prüfverfahren für die Haarrissbeständigkeit keramischer Gegenstände

Diese Europäische Norm legt zwei Prüfverfahren fest (Verfahren A und B) für die Bestimmung der Haar-rissbeständigkeit von glasierten Gegenständen in Kontakt mit Lebensmitteln, deren Wasseraufnahmefähigkeit höher als 0,5 % ist (bestimmt nach Verfahren C nach EN 1217:1997). Verfahren A ist eine Prüfung der Beständig-keit gegen Haarrissbildung infolge von Feuchtigkeitsdehnung. Verfahren B ist eine Prüfung der Beständigkeit gegen Haarrissbildung infolge einer thermischen Schockbeanspruchung; sie entspricht im Wesentlichen EN 1183:1995.

Matériaux et articles en contact avec les denrées alimentaires - Méthodes d'essai de la résistance au tressaillage des articles en céramique

La présente Norme européenne spécifie deux méthodes d'essai (méthodes A et B) permettant de déterminer la résistance au tressaillage de la vaisselle en céramique émaillée en contact avec des denrées alimentaires et présentant une absorption d'eau supérieure à 0,5 % (déterminée selon la méthode C de l'EN 1217:1997). La méthode A est un essai de résistance au tressaillage provoqué par un gonflement dû à l'humidité. La méthode B est un essai de résistance au tressaillage dû au choc thermique ; elle est très proche de la méthode préconisée dans l'EN 1183:1997.

Materiali in predmeti v stiku z živili - Preskusne metode ugotavljanja odpornosti razpokanja keramičnih predmetov

General Information

Status
Published
Publication Date
29-Jun-2003
Withdrawal Date
29-Sep-2003
Current Stage
9093 - Decision to confirm - Review Enquiry
Completion Date
20-Jul-2022

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Werkstoffe und Gegenstände in Kontakt mit Lebensmitteln - Prüfverfahren für die Haarrissbeständigkeit keramischer GegenständeMatériaux et articles en contact avec les denrées alimentaires - Méthodes d'essai de la résistance au tressaillage des articles en céramiqueMaterials and articles in contact with foodstuffs - Test methods for crazing resistance of ceramic articles67.250Materiali in predmeti v stiku z živiliMaterials and articles in contact with foodstuffsICS:Ta slovenski standard je istoveten z:EN 13258:2003SIST EN 13258:2003en01-julij-2003SIST EN 13258:2003SLOVENSKI
STANDARDSIST ENV 13258:20001DGRPHãþD



SIST EN 13258:2003



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13258March 2003ICS 67.250; 97.040.60English versionMaterials and articles in contact with foodstuffs - Test methodsfor crazing resistance of ceramic articlesMatériaux et articles en contact avec les denréesalimentaires - Méthodes d'essai de la résistance autressaillage des articles en céramiqueWerkstoffe und Gegenstände in Kontakt mit Lebensmitteln- Prüfverfahren für die Haarrissbeständigkeit keramischerGegenständeThis 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 EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland andUnited Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13258:2003 ESIST EN 13258:2003



EN 13258:2003 (E)2ContentspageForeword.31Scope.42Terms and definitions.43Principles.44Apparatus.45Samples.56Procedure.57Expression of results.68Test report.7Annex A (informative)
Calculation of a Crazing Resistance Index from data obtained by method A.8Annex B (informative)
Calculation of a Crazing Resistance Index from data obtained by Method B.10SIST EN 13258:2003



EN 13258:2003 (E)3ForewordThis document (EN 13258:2003) has been prepared by Technical Committee CEN/TC 194 “Utensils in contact withfood”, the secretariat 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 orby endorsement, at the latest by September 2003, and conflicting national standards shall be withdrawn at thelatest by September 2003.This document supersedes ENV 13258:1998.Annexes A and B are informative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovak Republic, Spain, Sweden, Switzerland and the United Kingdom.SIST EN 13258:2003



EN 13258:2003 (E)41 ScopeThis European Standard specifies two test methods (methods A and B) for the determination of crazing resistanceof glazed ceramic tableware articles in contact with food with water absorption higher than 0,5 % (determinedaccording 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 most respects toEN 1183:1997.2 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply.2.1crazingformation of very fine cracks in the glaze caused by either moisture expansion of the body or thermal stress whichcreates sufficient tension in the glaze to cause it to craze2.2moisture expansionexpansion of ceramic bodies with high water absorption due to penetration of water vapour through imperfections inthe glaze2.3thermal shocksudden change in temperature3 Principles3.1 Method AThe samples are subjected to saturated steam at a defined pressure for a number of cycles in an autoclave to testresistance to crazing due to moisture expansion. The steam pressure is increased and reduced slowly in order tominimize thermal shock. The samples are examined for crazing after each cycle. A stain is applied to the surface toaid in the detection of crazing cracks.3.2 Method BSamples are heated in a test oven and then cooled rapidly in a cold water bath under controlled conditions in orderto subject the articles to thermal shock.Thermal shock tests are repeated using increasing temperature differences. The samples are examined for crazingafter each thermal shock test. The water in the cold water bath is stained to aid in the detection of crazing cracks.4 ApparatusNOTEItems 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 contain 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 steamgenerator. The autoclave shall be equipped with: a pressure gauge; a safety valve; a means to reduce pressurewithin the autoclave to atmospheric pressure for safe opening at the end of each cycle and a means of controllingthe steam pressure at (340 ± 34) kPa.4.2Aqueous solution containing (5 ± 1) g/l of eosine and (5 ± 1) g/l of domestic washing up liquid.SIST EN 13258:2003



EN 13258:2003 (E)54.3Soft cotton cloth4.4Cold water bath, comprising a bath or tank capable of containing at least five times the apparent volume ofthe overall dimensions of the samples being tested at one time (including the basket), fitted with a water circulator,a thermometer and a thermostatic control capable of maintaining, for the duration of all the tests, the watertemperature to within ± 2 °C of a specified lower temperature, t2, within the range 10 °C to 20 °C.4.5Test oven, preferably electrically heated, having a temperature operating range of up to at least 300 °C,fitted with an air circulating device to ensure that the temperature variati
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