1、February 2011 Translation by DIN-Sprachendienst.English price group 8No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 25.220.50!$my3“1748616www.din.deDDIN EN ISO 28762Vitreous and porcelain enamels Enamel coatings applied to steel for writing surfaces Specification (ISO 28762:2010)English translation of DIN EN ISO 28762:2011-02Emails und Emaillierungen Email-Schichten auf Stahl fr Schreibtafeln Anforderungen (ISO
3、 28762:2010)Englische bersetzung von DIN EN ISO 28762:2011-02maux vitrifis Revtements en mail appliqus sur lacier de surfaces dcriture Spcification (ISO 28762:2010)Traduction anglaise de DIN EN ISO 28762:2011-02SupersedesDIN EN 14864:2007-12www.beuth.deDocument comprises pagesIn case of doubt, the G
4、erman-language original shall be considered authoritative.1102.11 DIN EN ISO 28762:2011-02 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coatings” in collaboration with Technical Committee CE
5、N/TC 262 “Metallic and other inorganic coatings” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Working Committee NA 062-01-63 AA Prfung von Emails und Emaillierungen. The DIN
6、 Standards corresponding to the International Standards referred to in this document are as follows: ISO 2178 DIN EN ISO 2178 ISO 2813 DIN EN ISO 2813 ISO 4532 DIN ISO 4532 ISO 7724-1 DIN 5033-2, DIN 5033-3 and DIN 5033-7 ISO 7724-2 DIN 5033-7, DIN 5033-9 and DIN 53236 ISO 7724-3 DIN 6174 ISO 15695
7、DIN EN ISO 15695 ISO 28706-1 DIN EN 14483-1 Amendments This standard differs from DIN EN 14864:2007-12 as follows: a) normative references have been updated; b) the standard has been editorially revised. Previous editions DIN EN 14864: 2005-11, 2007-12 DIN EN ISO 28762:2011-02 3 National Annex NA (i
8、nformative) Bibliography DIN 5033-2, Colorimetry Part 2: Standard colorimetric systems DIN 5033-3, Colorimetry Part 3: Colorimetric measures DIN 5033-7, Colorimetry Part 7: Measuring conditions for object colours DIN 5033-9, Colorimetry Part 9: Reflectance standard for calibration in colorimetry and
9、 photometry DIN 6174, Colorimetric evaluation of colour coordinates and colour differences according to the approximately uniform CIELAB colour space DIN 53236, Testing of colouring materials Conditions of measurement and evaluation for the determination of colour differences for paint coatings, sim
10、ilar coatings and plastics DIN EN 14483-1, Vitreous and porcelain enamels Determination of resistance to chemical corrosion Part 1: Determination of resistance to chemical corrosion by acids at room temperature DIN EN ISO 2178, Non-magnetic coatings on magnetic substrates Measurement of coating thic
11、kness by the magnetic method DIN EN ISO 2813, Paints and varnishes Determination of specular gloss of non-metallic paint films at 20, 60 nd 85 DIN EN ISO 15695, Vitreous and porcelain enamels Determination of scratch resistance of enamel finishes DIN ISO 4532, Vitreous and porcelain enamels Determin
12、ation of the resistance of enamelled articles to impact Pistol test aDIN EN ISO 28762:2011-02 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 28762 November 2010 ICS 25.220.50 Supersedes EN 14864:2005+A1:2007English Version Vitreous and porcelain enamels E
13、namel coatings applied to steel for writing surfaces Specification (ISO 28762:2010) maux vitrifis Revtements en mail appliqus sur lacier de surfaces dcriture Spcification (ISO 28762:2010) Emails und Emaillierungen Email-Schichten auf Stahl fr Schreibtafeln Anforderungen (ISO 28762:2010) This Europea
14、n Standard was approved by CEN on 14 November 2010. 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 con
15、cerning such national standards may be obtained on application to the CEN-CENELEC 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 i
16、nto its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ire
17、land, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix
18、17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 28762:2010: EContents DIN EN ISO 28762:2011-02 EN ISO 28762:2010 (E) 2 Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .5 4 Stee
19、l substrate requirements .5 5 Final thickness of fired enamel 5 6 Functional characteristics of the coating .5 6.1 Adherence test.5 6.2 Wear resistance .6 6.3 Impact resistance.6 6.4 Surface hardness (Mohs)6 6.5 Scratch resistance.6 6.6 Flatness 6 6.7 Acid and chemical resistance 6 7 Aesthetic chara
20、cteristics of coating6 7.1 Colour .6 7.2 Gloss .7 7.3 Surface appearance.7 8 Writability and erasability .7 8.1 Chalkboards .7 8.2 Whiteboards .7 9 Resistance to graffiti .7 Foreword This document (EN ISO 28762:2010) has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic c
21、oatings” in collaboration with Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” 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 or by endorsement, at the latest by May 2
22、011, and conflicting national standards shall be withdrawn at the latest by May 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights.
23、This document supersedes EN 14864:2005+A1:2007. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Fr
24、ance, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 28762:2010 has been approved by CEN as a EN ISO 287
25、62:2010 without any modification. DIN EN ISO 28762:2011-02 EN ISO 28762:2010 (E) 3 WARNING This International Standard calls for the use of substances and/or procedures that may be injurious to health if adequate safety measures are not taken. This International Standard does not address any health
26、hazards, safety or environmental matters associated with its use. It is the responsibility of the user of this International Standard to establish appropriate health, safety and environmentally acceptable practices and take suitable actions for any national and international regulations. Compliance
27、with this International Standard does not in itself confer immunity from legal obligations. 1 Scope This International Standard specifies the requirements for the functional and aesthetic characteristics of vitreous and porcelain enamel coatings applied to plain steel, for use as writing surfaces (w
28、hiteboards and chalkboards). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applie
29、s. ISO 2178, Non-magnetic coatings on magnetic substrates Measurement of coating thickness Magnetic method ISO 2813, Paints and varnishes Determination of specular gloss of non-metallic paint films at 20, 60 and 85 ISO 2813:1994/Cor.1:1997, Paints and varnishes Determination of specular gloss of non
30、-metallic paint films at 20, 60 and 85. Technical Corrigendum 1:1997 ISO 4532, Vitreous and porcelain enamels Determination of the resistance of enamelled articles to impact Pistol test ISO 7724-1, Paints and varnishes Colorimetry Part 1: Principles ISO 7724-2, Paints and varnishes Colorimetry Part
31、2: Colour measurement ISO 7724-3, Paints and varnishes Colorimetry Part 3: Calculation of colour differences ISO 15695, Vitreous and porcelain enamels Determination of scratch resistance of enamel finishes ISO 15695:2000/Cor.1:2000, Vitreous and porcelain enamels Determination of scratch resistance
32、of enamel finishes. Technical Corrigendum 1:2000 ISO 28706-1:2008, Vitreous and porcelain enamels Determination of resistance to chemical corrosion Part 1: Determination of resistance to chemical corrosion by acids at room temperature DIN EN ISO 28762:2011-02 EN ISO 28762:2010 (E) 4 EN 10209:1996, C
33、old rolled low carbon steel flat products for vitreous enamelling Technical delivery conditions EN 15771, Vitreous and porcelain enamels Determination of surface scratch hardness according to the Mohs scale ASTM C501, Standard Test Method for Relative Resistance to Wear of Unglazed Ceramic Tile by t
34、he Taber Abraser 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 vitreous enamel porcelain enamel substantially vitreous, or glassy, inorganic coating bonded to metal by fusion at a temperature above 500 C NOTE 1 This coating can be applied f
35、or protective, functional and/or decorative purposes. NOTE 2 Vitreous enamel is produced by the application of powdered inorganic glass, dry or suspended in water, on to the metal surface, and its subsequent fusion bonding. The fused coating exhibits a cubic thermal expansion of between 150 107/K an
36、d 450 107/K in the temperature range 20 C to 100 C, the actual value varying specifically with the type of substrate and the field of application. 3.2 vitreous- or porcelain-enamel writing surface facing material or component of a chalkboard or whiteboard NOTE Writing boards can have vitreous- or po
37、rcelain-enamelled sheets laminated to any of a variety of substrates, and perhaps framed, or can be made from fabricated vitreous- or porcelain-enamelled panels. 4 Steel substrate requirements The steel for enamelling shall conform to the requirements of EN 10209. The interested parties shall determ
38、ine by mutual agreement the required thickness of the steel. The steel shall be free from all defects that may affect the appearance of the surface finish. 5 Final thickness of fired enamel When determined in accordance with ISO 2178, the thickness of the enamel on the outer face of the product shal
39、l be 250 m maximum for whiteboards and 200 m maximum for chalkboards. 6 Functional characteristics of the coating 6.1 Adherence test The adherence of the enamelled coating shall be determined in accordance with EN 10209:1996, Annex D. For steel thicknesses of less than 0,6 mm, a drop height of 300 m
40、m shall be used. The adherence of the enamel shall be at least level 3, as defined in EN 10209:1996, Annex D. DIN EN ISO 28762:2011-02 EN ISO 28762:2010 (E) 5 NOTE The test can be performed on pieces fired in parallel to the production panels. Because refire bonding is important, the test shall be p
41、erformed on the final cover coat. 6.2 Wear resistance The resistance to abrasion of enamelled surfaces shall be determined using the Taber apparatus in accordance with ASTM C501, using S 33 emery paper and a weight of 1 kg. The loss in mass after 1 000 revolutions shall be a maximum of 0,10 g. This
42、test shall not serve as guidance for assessing the loss in gloss. 6.3 Impact resistance When the resistance to impact is determined in accordance with ISO 4532, with the pistol activated with a load of 20 N, there shall be no damage over 2 mm in diameter after 24 h. NOTE The mark of the striking bol
43、t is not regarded as damage (see ISO 4532). 6.4 Surface hardness (Mohs) When determined in accordance with EN 15771, the Mohs surface hardness shall be a minimum of 5 for whiteboard and a minimum of 3 for chalkboard. 6.5 Scratch resistance When determined in accordance with ISO 15695, the scratch re
44、sistance of whiteboard shall be a minimum of 7 N. The scratch resistance of silk-screened whiteboard shall be a minimum of 4 N. 6.6 Flatness Flatness deviations which are not perturbing to the viewer when the finished writing surface is observed from normal distances are acceptable. 6.7 Acid and che
45、mical resistance When determined in accordance with Clause 9 of ISO 28706-1:2008, the citric acid resistance shall be a minimum of class A for whiteboards. When determined in accordance with Clause 11 of ISO 28706-1:2008 for a test time of 15 min 30 s, the chemical resistance shall be a minimum of c
46、lass A for whiteboards and chalkboards for each of the following liquids: deionized water, ethanol, methylethylketone, xylene and toluene. 7 Aesthetic characteristics of coating 7.1 Colour Colour shall form the subject of an agreement between the contracting parties. Conformity can be determined vis
47、ually, in accordance with an agreed method, or using suitable equipment such as a colorimeter or a spectrometer. DIN EN ISO 28762:2011-02 EN ISO 28762:2010 (E) 6 NOTE The colour of the enamelled surface is characterized by constancy over time. 7.2 Gloss The gloss of the enamelled coating shall be th
48、e subject of an agreement between the contracting parties. Compliance can be determined visually, in accordance with an agreed method, or measured with a gloss meter using an appropriate method, such as that specified in ISO 2813. In all cases, the gloss shall be in the range 2 units to 20 units (at
49、 an angle of incidence of 60 in accordance with ISO 2813) for chalkboards and at least 35 units (at an angle of incidence of 60 in accordance with ISO 2813) for whiteboards. 7.3 Surface appearance Every other aspect of the surface (such as orange peel and silk-screened patterns) shall form the subject of an agreement between the contracting parties. 8 Writability and erasability 8.1 Chalkboards The surface of chalkboards shall be suitable and e
