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1、BRITISH STANDARD BS EN ? 14864:2005 Vitreous and porcelain enamels Enamel coatings applied to steel for writing surfaces Specification The European Standard EN 14864:2005 has the status of a British Standard ICS 25.220.50 ? BS EN 14864:2005 This British Standard was published under the authority of
2、the Standards Policy and Strategy Committee? on 13 December 2005 BSI 13 December 2005 ISBN 0 580 46962 X National foreword This British Standard is the official English language version of ? EN 14864:2005. The UK participation in its preparation was entrusted to Technical Committee STI/36, Vitreous
3、enamel coatings, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep ? UK interests informed; monitor related international and European developments
4、and promulgate them in the UK. 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 this document may be found in the BSI Catalogue under the sec
5、tion 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 contract. Users are responsible for its correct applicatio
6、n. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the doc
7、ument was last issued. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14864 August 2005 ICS 25.220.50 English Version Vitreous and porcelain enamels - Enamel coatings applied to steel for writing surfaces - Specification Emaux vitrifis
8、- Revtements maills appliqus sur lacier de surfaces dcriture - Spcification Emails und Emaillierungen - Email-Schichten auf Stahl fr Schreibtafeln - Anforderungen This European Standard was approved by CEN on 8 July 2005. CEN members are bound to comply with the CEN/CENELEC Internal Regulations whic
9、h 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 Central Secretariat or to any CEN member. This European Stan
10、dard 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 Central Secretariat has the same status as the official versions. CEN members are the national stan
11、dards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COM
12、MITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14864:2005: E EN 14864:2005 (E) 2 C
13、ontentspage Foreword 3 1Scope.4 2Normative references .4 3Terms and definitions.5 4Steel substrate requirements.5 5Final thickness of fired enamel5 6Functional characteristics of coating5 6.1Adherence test5 6.2Wear resistance 6 6.3Impact resistance6 6.4Surface hardness (Mohs) .6 6.5Scratch resistanc
14、e6 6.6Flatness .6 6.7Acid and chemical resistance6 7Aesthetic characteristics of coating6 7.1Colour 6 7.2Gloss7 7.3Surface appearance7 8Writeability and eraseability.7 8.1Chalkboards 7 8.2Whiteboards 7 9Resistance to graffiti.7 ? EN 14864:2005 (E) 3 Foreword This European Standard (EN 14864:2005) ha
15、s been prepared by 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 February 2006,
16、 and conflicting national standards shall be withdrawn at the latest by February 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard : Austria, Belgium, Cyprus, Czech Republic, Denmark,
17、 Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. ? EN 14864:2005 (E) 4 1 Scope This European Standard specifies the requirement
18、s for the functional and aesthetic characteristics of vitreous or porcelain enamel coatings applied to plain steel for use as writing surfaces (whiteboards and chalkboards). 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For
19、 dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 101 Ceramic tiles - Determination of scratch hardness of surface according to Mohs EN 10209: 1996 Cold rolled low carbon steel flat products
20、 for vitreous enamelling Technical delivery conditions 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 EN ISO 2178 Non-magnetic coatings on magnetic substrates - Me
21、asurement of coating thickness - Magnetic method (ISO 2178:1982) EN ISO 2813 Paints and varnishes - Determination of specular gloss of non-metallic paint films at 20, 60 and 85 (ISO 2813:1994, including Technical Corrigendum 1:1997) EN ISO 15695 Vitreous and porcelain enamels - Determination of scra
22、tch resistance of enamel finishes (ISO 15695:2000, including Technical Corrigendum 1:2000) 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 va
23、rnishes Colorimetry Part 2: Colour measurement ISO 7724-3, Paints and varnishes Colorimetry Part 3: Calculation of colour differences ASTM C501: Standard test method for relative resistance to wear of unglazed ceramic tiles by the Taber Abrader ? EN 14864:2005 (E) 5 3 Terms and definitions For the p
24、urposes of this European Standard, the following terms and definitions apply. 3.1 vitreous or porcelain enamel substantially vitreous, or glassy, inorganic coating bonded to metal by fusion at a temperature above 500 C NOTE Vitreous or porcelain enamel is a glazed surface finish designed for applica
25、tion to metallic surfaces for protective, functional and or decorative purposes. It 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 cubic thermal expansion of between 150K and
26、 450 x 10-7 K in the temperature range 20 C to 100 C, the actual value varying specifically with the type of substrate and 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 porcel
27、ain enamelled sheets laminated to any of a variety of substrates, and perhaps framed, or 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 by mu
28、tual 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 tested in accordance with EN ISO 2178, the thickness of the enamel on the outer side of the product shall be 250 m
29、 maximum for whiteboards and 200 m maximum for chalkboards. 6 Functional characteristics of coating 6.1 Adherence test The adherence of the enamelled coating shall be tested in accordance with EN 10209: 1996, Annex D. For steel thickness less than 0,6 mm a fall height of 300 mm shall be used. The ad
30、herence of the enamel shall be at least level 3 of EN 10209: 1996, Annex D. NOTE The test can be performed on pieces fired in parallel to the production panels. Because refire bond is important, the test shall be performed on the final cover coat. ? EN 14864:2005 (E) 6 6.2 Wear resistance The resist
31、ance to abrasion of enamelled surfaces shall be tested using the TABER apparatus in accordance with ASTM C501, using emery paper S 33, and a weight of 1 kg. The loss in mass after 1000 revolutions shall be a maximum of 0,10 g. This test shall not serve as guidance for assessing loss in gloss. 6.3 Im
32、pact resistance When the resistance to impact is tested in accordance with ISO 4532, and the pistol activated with a load of 20 N, there shall be no damage over 2 mm in diameter after 24 h. 6.4 Surface hardness (Mohs) When tested in accordance with EN 101, the Mohs surface hardness shall be a minimu
33、m 5 for whiteboard, and a minimum 3 for chalkboard. 6.5 Scratch resistance When determined in accordance with EN ISO 15695, 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 s
34、hall not be disturbing, when the finished writing surface is observed from normal distances. 6.7 Acid and chemical resistance When tested in accordance with EN 14483-1, the acid resistance shall be a minimum of class A for whiteboards. When tested in accordance with EN 14483-1, the chemical resistan
35、ce shall be a minimum of class A for whiteboards and chalkboards for each of the following: 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
36、 be determined visually, according to predefined methods, or using suitable equipment such as a colorimeter or a spectrometer. NOTE The colour of the enamelled surface is characterised by constancy over time. ? EN 14864:2005 (E) 7 7.2 Gloss The gloss of the enamelled coating shall be the subject of
37、an agreement between the contracting parties. Compliance can be tested visually, according to predefined methods or measured with a gloss meter using an appropriate method such as EN ISO 2813. In all cases, the gloss shall be in the range 2 to 20 units (at an angle of incidence of 60 in accordance w
38、ith EN ISO 2813) for chalkboards and at least 35 units (at an angle of incidence of 60 in accordance with EN ISO 2813) for whiteboards. 7.3 Surface appearance Every other particular aspect of the surface (minimal orange peel, silk-screened patterns, etc.) shall form the subject of an agreement betwe
39、en the contracting parties. 8 Writeability and eraseability 8.1 Chalkboards The surface of chalkboards shall be suitable and easy to write on. Removal of writing shall be achieved smoothly with a dry felt eraser or latex sponge. 8.2 Whiteboards The surface shall be easy to write on with dry-erasable
40、, 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 writings shall be easy to wipe off with water. Permanent felt-marker writing shall be easy to remove with alcohol or any other solvent,
41、 without visual colour or gloss change on the surface. After a thorough cleaning, the surface contamination or colour fading under influence of the marker pigment shall not exceed E* = 0,5 (see ISO 7724-1, ISO 7724-2, ISO 7724-3 and CIELAB). NOTE CIELAB is an abbreviation for the colour difference f
42、ormula CIE 1976 (L*a*b*) recommended by the Commission Internationale de LEclairage (CIE) and is normatively referred to in ISO 7724: (all parts). 9 Resistance to graffiti After eight days of ageing at room temperature, inks, varnishes, lacquers or paints shall be easily removable with solvents, wit
43、hout any visible gloss or colour change. ? BS EN ? 14864:2005 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It
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