Page 74 - QRedition5.0 062021

Quality Requirements Edition 5.0 European Enamel Association

7.20. QUALITY REQUIREMENTS FOR PORCELAIN AND VITREOUS ENAMELLED INDUSTRIAL TANKS

7.20.1 Application area

This norm is applicable for enamelled panels for industrial tanks (not chemical vessels). The steel quality must be suitable for enamelling and is to be agreed upon between the enameller

and the steel manufacturer / supplier.

7.20.2 Test methods

Item Name Comparable standards
3.5 visual assessment EEA 8.7
3.9.3 determination of the hardness referring to Mohs EN 101
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
or other acids at room temperature EN ISO 28706-1/9
4.5 determination of the resistance to chemical corrosion by boiling citric acids EN ISO 28706-2/11, EN ISO 28706-2/6
4.6 determination of the resistance to chemical corrosion by boiling water and/or water vapour EN ISO 28706-2/14, EN ISO 28706-2/6

4.7 determination of the resistance to chemical corrosion by boiling detergent solution EN ISO 28706-3/10, EN ISO 28706-2/6
4.9 determination of the resistance to impact 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 (destructive) ISO 2746
4.25 determination of the resistance to chemical corrosion by hot sodium hydroxide solution EN ISO 28706-4/9
4.28 determination of the quality of steel for enamelling EN 10209 for cold rolled steel and EN 10025 or EN 10111 for hot rolled steel
or EN 10149 for HSLA steels
and EN 10222-1 for steel forgings for pressure applications
4.39 determination of the adherence of enamel to steel of more than 3 mm thickness EEA Specification 8.6.3

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