Name: EN ISO 28762:2010 — Vitreous and porcelain enamels - Enamel coatings applied to steel for writing surfaces - Specification (ISO 28762:2010)
SKU: EN ISO 28762:2010
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Scope and Application EN ISO 28762:2010 covers enamel coatings fused to steel substrates used for writing surfaces. It standardizes performance characteristics for whiteboards and chalkboards coated with vitreous or porcelain enamels.
Steel Substrate Requirements Steel used must conform to EN 10209, ensuring it is free from defects that might affect coating appearance and performance. The thickness of steel is determined by mutual agreement based on application needs.
Coating Thickness The maximum final thickness of fired enamel is 250 µm for whiteboards and 200 µm for chalkboards, measured via magnetic thickness tests per ISO 2178.
Functional Performance The standard outlines tests for critical attributes:
- Adherence: Enamel adherence to steel must achieve at least level 3 per EN 10209, resisting mechanical impacts.
- Wear Resistance: Evaluated using ASTM C501 with Taber abrasion, limiting mass loss to 0.10g after 1,000 revolutions.
- Impact Resistance: No damage over 2 mm diameter after impact per ISO 4532 requirements.
- Surface Hardness: Minimum Mohs hardness of 5 for whiteboards and 3 for chalkboards measured by EN 15771.
- Scratch Resistance: Minimum values specified according to ISO 15695.
- Chemical Resistance: High resistance to acids and various solvents per ISO 28706-1 testing methods.
Aesthetic Characteristics Color and gloss are subject to agreement between supplier and buyer, with gloss levels defined (e.g., minimum 35 units at 60° incidence for whiteboards per ISO 2813). Surface finish details, such as orange peel effect or silk-screen patterns, are customizable.
Write-ability and Erasability Whiteboards support dry-erasable, water-soluble, and permanent markers, with specifications ensuring easy removal of markings without damage or discoloration. Chalkboards must accommodate chalk writing easily erased with a dry eraser.
Graffiti Resistance The enamel surfaces can be cleaned of inks, paints, and varnishes using appropriate solvents without visible deterioration, ensuring longevity in high-usage environments.

EN ISO 28762:2010 PDF

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