Page 19 - 20250602 EEA QM Edition 6.0

Quality Requirements Edition 6.0 European Enamel Association

100 grams sodium pyrophosphate (analytical grade)
4.10 Determination of the adherence of the porcelain and vitreous enamel to the
substrate 1000 ml distilled water
The solution should be freshly prepared.
The testing of the adherence of the porcelain and vitreous enamel coating should be
carried out using the method as specified in EN10209 Annex C. The test should be carried out for 5 hours of hard boiling during which heavy vapour
bubbles must be rising from the bottom of the apparatus. The effect is measured by
the loss of mass of the test plates and given in g/m . (This test solution will need to be
2
4.11 Determination of the resistance to thermal shock
made up hot as the solubility at 20º C is approximately 50 g/L, and also that this test
The determination of the resistance to thermal shock should be carried out using the solution is twice the concentration of that used in the “Hoover” test.)
methods as specified in EN ISO 2747, unless the objects concerned are not suitable
for this test method. In these cases, the test method should be agreed and specified
in the quality requirements. 4.16 Determination of the permeability to hydrogen
The determination of the permeability of a cold rolled steel to hydrogen should be carried
4.12 Determination of the porosity by the high voltage test out using the methods as specified in EN 10209 Annex A1. See part 4.3 of EN ISO 28763.

The determination of the porosity by the high voltage test of the porcelain and vitreous
enamel coating should be carried out using the methods as specified in EN ISO 2746 4.17 Determination of gloss
and EN ISO 28721-1/4.3. High voltage test at 20 kV – subsequently 12 kV The determination of gloss should be carried out using the methods as specified in EN
ISO 2813. (This covers measurements at 20º, 60º and 85º. The USA measure specular
4.13 Determination, detection and location of defects (non-destructive) gloss of ceramic surfaces at 45º {ASTM C246} – The angle of measurement must be
specified by agreement.)
The non-destructive determination and detection of defects in the porcelain and
vitreous enamel coating should be carried out using either method A or B as specified
in EN ISO 8289-1. The test method selected should depend on the specific 4.18 Determination of scratch resistance
application circumstances. EN ISO 8289-2 will apply for enamel slurry. The determination of scratch resistance should be carried out using the methods as
specified in EN ISO 15695.
4.14 Determination of the resistance to abrasion
Now see 4.26 4.19 Determination of colour difference
The determination of colour difference should be carried out using the methods as
4.15 Determination of the resistance to chemical corrosion by boiling of a specified in EN ISO/CIE 11664 and EN ISO 18314.
solution of sodium pyrophosphate
The definition of the resistance to chemical corrosion of a solution of sodium 4.20 Determination of edge coverage
pyrophosphate should be carried out using EN ISO 28706-2/15 (see 4.7), using The determination of edge coverage should be carried out using the method as specified
the following test solution: in EN ISO 28723.

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