EN 15826:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Emails und Emaillierungen - TerminologieEmaux vitrifiés - TerminologieVitreous and porcelain enamels - Terminology25.220.50Emajlne prevlekeEnamels01.040.25Izdelavna tehnika (Slovarji)Manufacturing engineering (Vocabularies)ICS:Ta slovenski standard je istoveten z:EN 15826:2009SIST EN 15826:2010en,fr,de01-marec-2010SIST EN 15826:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15826
December 2009 ICS 01.040.25; 25.220.50 English Version
Vitreous and porcelain enamels - Terminology
Émaux vitrifiés - Terminologie
Emails und Emaillierungen - Terminologie This European Standard was approved by CEN on 7 November 2009.
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 bibliographical references concerning such national standards may be obtained on application to the CEN 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 CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
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Cross reference index of alternative terms . 28 SIST EN 15826:2010

1 Scope This European Standard defines a number of terms relating to vitreous and porcelain enamels and their technology. This list is not complete and only comprises those terms for which the definition is considered necessary for correct and adequate understanding in order to clarify these processes. It should be understood that the interpretations given are those corresponding to the practical usage in this field and that they do not necessarily coincide with those used in other fields. For purposes of clarification, the term Vitreous Enamel, used throughout this European Standard, is synonymous with Porcelain Enamel, the term favoured in the United States and some other countries. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. NOTE Annex A lists alternative terms and cross refers to primary terms used below. 2.1 abrasive blasting process for cleaning or finishing by means of an abrasive directed at high velocity against the work piece 2.2 abrasion resistance degree of resistance of vitreous enamel to be abraded by solid materials 2.3 acid resistance degree of resistance of vitreous enamel to attack by acidic corrosive chemicals 2.4 adherence (enamel-metallic substrate) adhesion degree of bonding between the fused vitreous enamel and the metallic substrate 2.5 adherence of powder ability of a vitreous enamel powder to remain attached by static attraction to a grounded substrate before firing 2.6 ageing change in properties of vitreous enamel slips, powders, reagents, or steel with the lapse of time 2.7 air seal air curtain flow of pressurised air across the entrance and exit of a continuous furnace that prevents heat escaping from the furnace but allows ware to pass through 2.8 alkali degreasing removal of oil, grease, lubricants, and loose debris from the surface of the metallic substrate by immersion or spraying with an aqueous alkali degreaser in preparation for vitreous enamelling SIST EN 15826:2010

NOTE 1 See boiling (2.26) and carbon boil (2.34). NOTE 2 This can be the result of reaction with the substrate or with contamination on the substrate surface. 2.22 blank sized piece of untreated metal sheet that will be used in forming the finished article 2.23 blasting process whereby solid metallic, mineral, synthetic resin, vegetable particles or water are projected at high velocity against a work piece for the purpose of cleaning, abrading or shot peening the surface 2.24 blister defect that appears as a localised bubble under the surface of the fired vitreous enamel 2.25 bloom visual exudation or efflorescence on the vitreous enamel surface NOTE See scumming (2.212). 2.26 boiling defect resembling areas of ground-coat pull-through, blisters and pinholes, visible after first cover-coat fire NOTE 1 See carbon boil (2.34) and black specks (2.21). NOTE 2 This can be the result of excessive ground-coat activity during cover-coat fire, as the ground-coat boils up through the cover-coat it maybe accompanied by a release of gases. 2.27 bolt-hole brush specially designed round brush used to remove vitreous enamel bisque from in and around small openings in the ware 2.28 box furnace furnace in which ware is fired according to a predetermined periodic cycle 2.29 break out defect characterised by areas of blisters, having well-defined boundaries 2.30 bubble structure size and spatial distribution of voids within the fired vitreous enamel layer SIST EN 15826:2010

NOTE 1 See boiling (2.26) and black specks (2.21). NOTE 2 Result of the oxidation of carbides and free carbon at or near the surface of the steel substrate during firing, resulting in evolution of gasses. 2.35 cascading
defect that starts with a few particles of powder detaching themselves after application and as they cascade down the ware they gather more and more powder leaving a trail of thinner and thinner coating NOTE Excess powder, inadequate powder adhesion and vibration contribute to this defect. 2.36 cast iron enamel vitreous enamel specifically formulated for application on cast iron substrate 2.37 cermet ceramic-metal coating mixture of one or more ceramic materials in combination with a metallic phase applied to a metallic substrate 2.38 chalkboard enamel blackboard enamel special type of matt vitreous enamel, used to provide a writing surface for chalk 2.39 chalky surface surface defect where the vitreous enamel surface has lost its gloss and taken on a powdery appearance
NOTE See scumming (2.212). SIST EN 15826:2010

plate weight amount of vitreous enamel retained on a test plate after dipping, flow coating or by slushing NOTE This is specified as either dry weight or wet weight retained per unit area on a test plate. 2.78 dipping (wet process) swilling (wet process) application of vitreous enamel by immersing the component in a bath of vitreous enamel slip, and subsequent removal of excess enamel by draining 2.79 dipping (dry process) application of vitreous enamel in dry process enamelling by briefly immersing the red hot component in powdered frit 2.80 direct fired furnace open flame furnace NOTE The products of combustion come into contact with the ware during firing. 2.81 direct-on-enamelling vitreous enamel coating, applied directly onto the metallic substrate and functioning as either a ground coat or as a finish coat 2.82 discontinuity weakness within the vitreous enamel coating that is detected by spark testing 2.83 double draining evidence of further flow having occurred after the apparent end of draining 2.84 double-face ware ware that has a finish coating on both surfaces 2.85 drain line defect resembling a streak of thicker or thinner enamel NOTE Drain lines result from the flow of excess enamel after dipping. SIST EN 15826:2010

NOTE See dip weight (2.77). 2.93 drying crack defect characterised as a fissure in the bisque, visible after firing 2.94 dulling lustreless finish to the vitreous enamelled surface 2.95 dust coat relatively thin, sprayed coating of vitreous enamel slip 2.96 easy-to-clean enamel ETC enamel vitreous enamel specifically formulated to allow the easy removal of food soil deposits from its surface NOTE ETC enamel needs to be neither pyrolytic nor catalytic. 2.97 edging process of removing vitreous enamel bisque from the edge of a piece of ware to expose the underlying vitreous enamel SIST EN 15826:2010

defect resulting from poor penetration by charged enamel particles into concave areas leading to thin spray and potentially to burn-off 2.108 film strength relative resistance of the vitreous enamel bisque to mechanical damage NOTE See cross-bend test (2.64). 2.109 fineness test control test used to measure the degree to which a vitreous enamel frit has been milled in either the wet or dry form, usually expressed in grams residue retained on a particular mesh sieve from a given sample size SIST EN 15826:2010

flake result of fusing a mixture of different inorganic raw materials, which constitute the vitrifiable base of the enamel, molten at temperatures between 1 150 °C and 1 350 °C and then quenched the molten glassy mass from these temperatures
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