Page 18 - 20250602 EEA QM Edition 6.0

Quality Requirements Edition 6.0 European Enamel Association

4.5 Determination of the resistance to chemical corrosion by boiling citric acids
4.0 TEST METHODS FOR PORCELAIN AND VITREOUS ENAMELLED
CERTIFIED PRODUCTS 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
The test methods, to which enamelled products with “European Enamel Association” apparatus as 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
water vapour
4.1 Production of the test specimens
The determination of the resistance to chemical corrosion by boiling water and/or water
The test specimens are produced according to EN ISO 28764. vapour should be carried out using the methods as specified in EN ISO 28706-2/14,
using the apparatus as specified in EN ISO 28706-2/6.
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 4.7 Determination of the resistance to chemical corrosion by boiling detergent
vitreous enamel coating is applied (EN ISO 16809 ultrasonic thickness solution
measurement) or after coating with porcelain and vitreous enamel by removal of the
The determination of the resistance to chemical corrosion by boiling detergent solution
porcelain and vitreous enamel by grinding or chemical dissolution; or by means of an
should be carried out using the methods as specified in EN ISO 28706-3/10, using the
examination of the cross section, using a microscope equipped with a suitable
apparatus as specified in EN ISO 28706-2/6.
magnification.

The test is to be carried out during 2,5 hours. The effect is measured by the loss of mass
4.3 Measurement of the thickness of the porcelain and vitreous enamel coating
2
of the test plates to be given in g/m .
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. 4.8 Specification and determination of the release of toxic elements
For ferromagnetic substrate materials the methods specified in EN ISO 2178 should
The specification and determination of the release of toxic elements must comply with
be used and for non-ferromagnetic substrate materials the methods specified in EN
the requirements specified in the national laws of the country.
ISO 2360 should be used. The method using an examination of the cross section with
a microscope, as specified in EN ISO 1463 may also be used.
4.9 Determination of the resistance to impact

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

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