Page 18 - QRedition5.0 062021

Quality Requirements Edition 5.0 European Enamel Association

4.0 TEST METHODS FOR PORCELAIN AND VITREOUS ENAMELLED PRODUCTS 4.5 Determination of the resistance to chemical corrosion by boiling citric acids
WITH THE ”EUROPEAN ENAMEL ASSOCIATION” LABEL The determination of the resistance to chemical corrosion by boiling citric acids, should

be carried out using the methods as specified in EN ISO 28706-2/11, using apparatus as
The test methods, to which enamelled products with ”European Enamel Association”
specified in EN ISO 28706-2/6.
label should be subjected depending on their application area, are detailed in this section.

4.6 Determination of the resistance to chemical corrosion by boiling water and/or
4.1 Production of the test specimens
water vapour
The test specimens are produced according to EN ISO 28764.
The determination of the resistance to chemical corrosion by boiling water and/or water

vapour should be carried out using the methods as specified in EN ISO 28706-2/14, using
4.2 Measurement of the thickness of the base substrate metal
The thickness of the base substrate metal is measured either before the porcelain and the apparatus as specified in EN ISO 28706-2/6.
vitreous enamel coating is applied (EN 14127 ultrasonic thickness measurement) or after
coating with porcelain and vitreous enamel by removal of the porcelain and vitreous enamel 4.7 Determination of the resistance to chemical corrosion by boiling detergent
by grinding or chemical dissolution; or by means of an examination of the cross section, solution
using a microscope equipped with a suitable magnification. The determination of the resistance to chemical corrosion by boiling detergent solution
should be carried out using the methods as specified in EN ISO 28706-3/10, using the
4.3 Measurement of the thickness of the porcelain and vitreous enamel coating apparatus as specified in EN ISO 28706-2/6.
Measurement of the thickness of the porcelain and vitreous enamel coating should be
carried out using a coating thickness meter with a measuring accuracy of 0,01mm. For The test is to be carried out during 2,5 hours. The effect is measured by the loss of mass
2
ferrromagnetic substrate materials the methods specified in EN ISO 2178 should be used of the test plates to be given in g/m .
and for non-ferromagnetic substrate materials the methods specified in EN ISO 2360
should be used. The method using an examination of the cross section with a 4.8 Specification and determination of the release of toxic elements

microscope, as specified in EN ISO 1463 may also be used. The specification and determination of the release of toxic elements must comply with the

requirements specified in the national laws of the country.
4.4 Determination of the resistance to chemical corrosion by citric acid or other
acids at room temperature
4.9 Determination of the resistance to impact
The determination of the resistance to chemical corrosion by citric acid or other acids
The resistance to impact of the porcelain and vitreous enamel coating should be carried
should be carried out using the methods as specified in EN ISO 28706-1/9. out using the Wegnerpistol, as specified in ISO 4532. The resistance to impact should be
carried out at a distance of at least 20 mm from the edges and the sides.

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