1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 28762:2010Vitreous and porcelain enamels Enamel coatings applied tosteel for writing surfaces Specification (ISO 28762:2010)BS EN ISO 28762:2010 BRITISH STANDARDNationa
2、l forewordThis British Standard is the UK implementation of EN ISO28762:2010. It supersedes BS EN 14864:2005 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/36, Vitreous enamel coatings.A list of organizations represented on this committee can beobt
3、ained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 71016 2ICS 25.220.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This
4、British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2010.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 28762 November 2010 ICS 25.220.50 Supersedes EN 14864:2005+A1:2007English
5、 Version Vitreous and porcelain enamels - Enamel 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 Schrei
6、btafeln - Anforderungen (ISO 28762:2010) This European 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
7、. Up-to-date lists and bibliographical references concerning 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 t
8、ranslation under the responsibility of a CEN member into 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, Fi
9、nland, France, Germany, Greece, Hungary, Iceland, Ireland, 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
10、 KOMITEE FR NORMUNG Management Centre: Avenue Marnix 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: EBS EN ISO 28762:2010EN ISO 28762:2010 (E) 3 Foreword This document (EN ISO 28762:2010) h
11、as been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coatings“ 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, ei
12、ther by publication of an identical text or by endorsement, at the latest by May 2011, 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 CEN
13、ELEC shall not be held responsible for identifying any or all such patent rights. 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,
14、 Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endo
15、rsement notice The text of ISO 28762:2010 has been approved by CEN as a EN ISO 28762:2010 without any modification. BS EN ISO 28762:2010ISO 28762:2010(E) ISO 2010 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards
16、bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizat
17、ions, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in th
18、e ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of
19、the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 28762 was prepared by Technical Committee ISO/TC 107, Metallic
20、and other inorganic coatings. This second edition cancels and replaces the first edition (ISO 28762:2008), of which it constitutes a minor revision. BS EN ISO 28762:2010BS EN ISO 28762:2010INTERNATIONAL STANDARD ISO 28762:2010(E) ISO 2010 All rights reserved 1Vitreous and porcelain enamels Enamel co
21、atings applied to steel for writing surfaces Specification 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 hazards, safety or envir
22、onmental 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 with this International
23、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 (whiteboards and chalkboar
24、ds). 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) applies. ISO 2178, Non-magneti
25、c 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-metallic paint films at
26、 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 2: Colour measurement IS
27、O 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 of enamel finishes. Tech
28、nical 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 BS EN ISO 28762:2010ISO 28762:2010(E) 2 ISO 2010 All rights reservedEN 10209:1996, Cold r
29、olled 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 the Ta
30、ber 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 for pr
31、otective, 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 and 450
32、 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 porcela
33、in-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 determine b
34、y 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 shall be
35、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 mm sha
36、ll be used. The adherence of the enamel shall be at least level 3, as defined in EN 10209:1996, Annex D. BS EN ISO 28762:2010ISO 28762:2010(E) ISO 2010 All rights reserved 3NOTE The test can be performed on pieces fired in parallel to the production panels. Because refire bonding is important, the t
37、est shall be performed 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
38、 0,10 g. This 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 th
39、e striking bolt 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,
40、the scratch resistance 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.
41、7 Acid and chemical 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
42、a minimum of class 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
43、determined visually, in accordance with an agreed method, or using suitable equipment such as a colorimeter or a spectrometer. BS EN ISO 28762:2010ISO 28762:2010(E) 4 ISO 2010 All rights reservedNOTE The colour of the enamelled surface is characterized by constancy over time. 7.2 Gloss The gloss of
44、the enamelled coating shall be the 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
45、the range 2 units to 20 units (at 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-screen
46、ed 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 easy to write on. Removal of writing shall be possible smoothly with a dry felt eraser or latex sponge. 8.2 Whiteboards
47、The surface shall be easy to write on with dry-erasable, water-soluble or permanent felt markers. Writing with dry-erasable felt markers shall be easy to wipe off dry with a felt eraser or a cotton cloth. Water-erasable writing shall be easy to wipe off with water. Permanent felt-marker writing shal
48、l be easy to remove with alcohol or another suitable solvent, without any visible change in the colour or gloss of the surface. After thorough cleaning, the surface contamination or colour fading under influence of the marker pigment shall not exceed E* = 0,5, where E* is the total colour difference
49、 using the CIELAB colour difference formula (see ISO 7724-1, ISO 7724-2, ISO 7724-3 and CIELAB). NOTE CIELAB is an abbreviation for the colour difference formula CIE 1976 (L*a*b*) recommended by the International Commission on Illumination (CIE). 9 Resistance to graffiti After eight days of ageing at room temperature, inks, varnishes, lacquers and paints on whiteboards shall be easily removable with suitable solvents, without any visible change in the gloss or colour of the enamel surfac
