Page 16 - QRedition5.0 062021

Quality Requirements Edition 5.0 European Enamel Association

3.0 QUALITY REQUIREMENTS FOR PORCELAIN AND VITREOUS ENAMELLED 3.6
PRODUCTS WITH THE ”EUROPEAN ENAMEL ASSOCIATION” LABEL 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 2 3.7
of these requirements and needs to be at least as stringent in terms of quality than the The thickness of the porcelain and vitreous enamel coating should be as consistent as
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 diminished.
3.2

The basis metal should be suitable for enamelling. It should be manufactured and treated 3.8

so that it is not the source of defects in the enamel coating which would influence the quality The thickness of the porcelain and vitreous enamel coating should meet the maximum and
and value of the final enamelled product. the minimum values as defined for the specified area(s) of application.

3.3 3.9

The dimensions and the thickness of the material should be appropriate to the specific The porcelain and vitreous enamel coating should show good adherence to the basic metal.
requirements of the enamelling process to ensure satisfactory mechanical stability of the

final enamelled product. The product should be designed and produced to minimize the risk 3.9.1
of damage to the enamel coating, for example by avoiding excessively sharp radii during The porcelain and vitreous enamel coating should also meet the minimum requirements for

forming, elimination of unsuitable welding practice and care to avoid the development of other physical properties defined for the specified stated area(s) of application.

stresses during firing.
3.9.2

3.4 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
The porcelain and vitreous enamel coating should have sufficient corrosion resistance for
requirements which are defined for the specified stated area(s) of application.
the specific area(s) of application.

3.5 3.9.3
The surface of the porcelain and vitreous enamel coating should not show obvious or The porcelain and vitreous enamel coating should have a minimum hardness of 5 on the
Mohs (EN15771).
substantial defects on inspection at a distance which is normal for the application, under
diffuse light conditions. (See also EEA specification 8.7)

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