Page 89 - 20250602 EEA QM Edition 6.0

Quality Requirements Edition 6.0 European Enamel Association

7.25. QUALITY REQUIREMENTS FOR PORCELAIN AND VITREOUS ENAMELLED SILOS FOR AGRICULTURAL SOLIDS

7.25.1 Application area

This norm is applicable for enamelled silos for agricultural solids, made from steel.
This norm is not applicable for enamelled industrial tanks. For these tanks apply application areas 7.20 or 7.21.

7.25.2 Test methods

Item Name Comparable standards
3.5 visual assessment EEA 8.7
3.9.3 determination of the hardness referring to Mohs EN ISO 6769
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 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
4.6 determination of the resistance to chemical corrosion by boiling water and/or water EN ISO 28706-2/14
vapour
4.8 specification and determination of the release of toxic elements national laws
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
4.13 determination, detection and location of defects (non-destructive) EN ISO 8289-1 Method A
4.25 determination of the resistance to chemical corrosion by hot sodium hydroxide EN ISO 28706-4/9
solution
4.28 determination of the quality of steel for enamelling conforming EN 10111, EN 10025-1, EN 10149–1 and ASTM A 1011
see also 4.28 recommendations for hot rolled steels and HSLA steels
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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