Page 16 - 20250602 EEA QM Edition 6.0

Quality Requirements Edition 6.0 European Enamel Association

3.0 QUALITY REQUIREMENTS FOR EUROPEAN ENAMEL ASSOCIATION 3.6
CERTIFIED PRODUCTS Surfaces of parts of the same colour should not show unacceptable colour differences,
when inspected at a normal inspection distance and under standard light conditions.
3.1
The porcelain and vitreous enamel should comply with the definitions given in section 3.7
2 of these requirements and needs to be at least as stringent in terms of quality than The thickness of the porcelain and vitreous enamel coating should be as consistent as
the equivalent European standard. possible and should not show excessively increased thickness at curved surfaces or at
small radii, to ensure that the useful quality of the final enamelled product is not
3.2 diminished.
The basis metal should be suitable for enamelling. It should be manufactured and
treated so that it is not the source of defects in the enamel coating which would 3.8
influence the quality and value of the final enamelled product. The thickness of the porcelain and vitreous enamel coating should meet the maximum
and the minimum values as defined for the specified area(s) of application.
3.3
The dimensions and the thickness of the material should be appropriate to the specific 3.9
requirements of the enamelling process to ensure satisfactory mechanical stability of The porcelain and vitreous enamel coating should show good adherence to the basic
the final enamelled product. The product should be designed and produced to metal.
minimize the risk of damage to the enamel coating, for example by avoiding
excessively sharp radii during forming, elimination of unsuitable welding practice and 3.10
care to avoid the development of stresses during firing.
The porcelain and vitreous enamel coating should also meet the minimum requirements
for other physical properties defined for the specified stated area(s) of application.
3.4

The porcelain and vitreous enamel coating should have sufficient corrosion 3.11
resistance for the specific area(s) of application. The chemical resistance of the porcelain and vitreous enamel coating should be in
accordance with the specified area(s) of application and should meet the quality
3.5 requirements which are defined for the specified stated area(s) of application.
The surface of the porcelain and vitreous enamel coating should not show obvious
or substantial defects on inspection at a distance which is normal for the application, 3.12
under diffuse light conditions. (See also EEA specification 8.7)
The porcelain and vitreous enamel coating should have a minimum hardness of 5 on the
Mohs (EN ISO 6769).

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