Page 93 - 20250602 EEA QM Edition 6.0

Quality Requirements Edition 6.0 European Enamel Association

7.27. QUALITY REQUIREMENTS FOR PORCELAIN AND VITREOUS ENAMELLED SIGNS AND ADVERTISING BOARDS

7.27.1 Application area

These requirements are applicable for enamelled signs and advertising boards of which the base material consists of steel.

7.27.2 Test methods

Item Name Applicable standards
4.2 measurement of the thickness of the base substrate metal EN ISO 16809
4.3 measurement of the thickness of the enamel coating EN ISO 2178, EN ISO 2360, EN ISO 1463
4.4 determination of the resistance to chemical corrosion by citric acid EN ISO 28706-1/9
or other acids at room temperature
4.5 determination of the resistance to chemical corrosion by boiling citric acids EN ISO 28706-2/11, EN ISO 28706-2/6
4.9 determination of the resistance to impact EN ISO 4532
4.10 determination of the adherence of the enamel to the substrate EN 10209 Annex C
4.12 determination of the porosity by the high voltage test EN ISO 2746, EN 14430
4.13 determination, detection and location of defects (non-destructive) EN ISO 8289-1, EN ISO 8289-2
4.18 determination of scratch resistance EN ISO 15695
4.19 determination of colour difference EN ISO 18314, EN ISO/CIE 11664
4.26 determination of abrasion resistance ASTM C501
4.28 determination of the quality of steel for enamelling EN 10209 for cold rolled steel and see 4.28 recommendations for hot rolled steels,
HSLA steels and steel forgings for pressure applications

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