Page 86 - QRedition5.0 062021

Quality Requirements Edition 5.0 European Enamel Association

7.25.3 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
4.3 thickness enamel coating 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 weight loss: max.7 g/m per 2.5 hours on test sheets may be conform when taking into production a sig.diff.

to EN ISO 28764, EN ISO 28706-2 enamel recipe, but at least 1 x a year
2
4.6 boiling water weight loss: max. 7 g/m per 48 hours liquid phase EN ISO 28706-2 when taking into production a sig.diff.

on test sheets may be conform enamel recipe, but at least 1 x a year
be conform to EN ISO 28764,
test duration 48 hours
4.9 impact resistance at 20 N no damage on test sheets may be conform when taking into production a sig.diff.

> 2.0 mm diameter after 24 hours to EN ISO 28764, ISO 4532 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 conform to EN ISO 8289 S4/AQL 2.5
EN ISO 8289 and no defects > 1 mm diameter, see remarks 7.25.4
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 two-side enamelling quality steel
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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