Page 84 - QRedition5.0 062021

Quality Requirements Edition 5.0 European Enamel Association

7.24.3 Quality requirements

Test method Requirement Remarks Frequency
2
3.5 visual assessment internal 0 defects, external max. 5 defects/m in production 100 %
3.9.3 hardness hardness Mohs ≥ 5 on test sheets when taking into production a sig.diff.
enamel recipe, but at least 1 x a year
4.2 material thickness in accordance with the requirements as to the strength when taking into production
4.3 thickness enamel coating inner and outer 0.34 ± 0.16 mm S4/AQL 2.5
4.4 cold citric acid min. class A EN ISO 28706-1 when taking into production a sig.diff.

enamel recipe, but at least 1 x a year
2
4.5 boiling citric acid internal 7 g/m per 2.5 hours EN ISO 28706-2 when taking into production a sig.diff.

enamel recipe, but at least 1 x a year
2
4.6 boiling water internal 7 g/m per 48 hours liquid phase test duration 48 hours, EN ISO 28706-2 when taking into production a sig.diff.

enamel recipe, but at least 1 x a year
4.8 release of toxic elements conform to the national laws when taking into production a sig.diff.
enamel recipe
4.9 impact resistance inner and outer: at 20 N no damage > 2.0 mm when taking into production a sig.diff.

diameter after 24 hours enamel recipe, but at least 1 x a year
4.10 adherence min. 2 (metal less than 3 mm) on test sheets conform to EN ISO 28764 in production 1 x a month
2
4.13 defects inner max. 5 defects per m according to S4/AQL 2.5
EN ISO 8289 and no defects > 1 mm diameter,
reparations (touch up) are allowed
2
4.25 sodium hydroxide 80 °C max. 8 g/m per 24 hours test duration 24 hours when taking into production a sig.diff.

EN ISO 28706-4 enamel recipe, but at least 1 x a year
4.28 steel quality double-sided enamelling steel quality
or suitable construction steel for applied processing
4.39 adherence min. ”good” (metal more than 3 mm) on test sheets conform to EN ISO 28764 in production 1 x a month

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