Page 19 - QRedition5.0 062021

Quality Requirements Edition 5.0 European Enamel Association

4.10 Determination of the adherence of the porcelain and vitreous enamel to the 100 grams sodium pyrophosphate (analytical grade)
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
4.11 Determination of the resistance to thermal shock
2
of mass of the test plates and given in g/m . (This test solution will need to be made up
The determination of the resistance to thermal shock should be carried out using the
hot as the solubility at 20º C is approximately 50 g/L, and also that this test solution is twice
methods as specified in ISO 2747, unless the objects concerned are not suitable for this the concentration of that used in the ”Hoover” test.)
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 steel to hydrogen should be carried out using the
4.12 Determination of the porosity by the high voltage test (destructive) methods as specified in EN 10209 Annex A1.
The determination of the porosity by the high voltage test of the porcelain and vitreous
See part 3.3 of EN 14866/December 2003.
enamel coating should be carried out using the methods as specified in ISO 2746 and EN

ISO 28721-1/4.3. High voltage test at 20 kV – subsequently 12 kV 4.17 Determination of gloss
The determination of gloss should be carried out using the methods as specified in EN ISO
4.13 Determination, detection and location of defects (non-destructive)
2813. (This covers measurements at 20º, 60º and 85º. The USA measure specular gloss
The non-destructive determination and detection of defects in the porcelain and vitreous
of ceramic surfaces at 45º {ASTM C246} – The angle of measurement must be specified
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 application circumstances by agreement.)
EN ISO 8289-2 will apply for enamel slurry.
4.18 Determination of scratch resistance
The determination of scratch resistance should be carried out using the methods as
4.14 Determination of the resistance to abrasion specified in EN ISO in
Now see 4.26 15695.

4.15 Determination of the resistance to chemical corrosion by boiling of a solution 4.19 Determination of colour difference
of sodium pyrophosphate The determination of colour difference should be carried out using the methods as

The definition of the resistance to chemical corrosion of a solution of sodium specified in ISO 11664and ISO 18314.
pyrophosphate should be carried out using EN ISO 28706-2/15 (see 4.7), using the
following test solution: 4.20 Determination of edge coverage

The determination of edge coverage should be carried out using the method as specified
in EN ISO 28723.
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