Page 20 - QRedition5.0 062021

Quality Requirements Edition 5.0 European Enamel Association

4.21 Determination of resistance to heat 4.27 Determination of the steel surface activity (pickling speed, weight loss)
Determination of the resistance to heat should be carried out using the methods as The determination of the steel surface activity should be carried out using the methods as

specified in ISO 4530. specified in EN 10209: Annex B.

4.22 Determination of the resistance to fish scaling 4.28 Determination of the quality of steel for enamelling
The determination of the resistance to fishscale should be carried out using the methods The determination of the quality of steel for enamelling should be carried out using the
as specified in EN 10209 Annex A2, by which the test sheet (150 mm x coil width) is pre- methods as specified in EN 10209 for cold rolled steel and EN 10025 or EN 10111 for hot
treated without nickel. The front and back sides are enamelled with a fishscale sensitive rolled steel.
porcelain and vitreous enamel supplied by the several manufacturers of enamel/frit. Coating
thickness, firing temperature, firing time and potential thermal treatment shall be specified Also qualities from EN 10149 for HSLA steels and EN 10222-1 for steel forgings for
by the frit supplier. See part 3.3 of EN 14866. pressure applications are used.

4.23 Requirements, measurements and tests for cookware, ovenware (& kettles)
The requirements for measurements and tests for cookware are specified in EN 12983, for
ovenware EN 13834 (and for kettles in EN 13750)

4.24 Determination of the resistance of domestic utensils to mechanical
dishwashing
The determination of domestic utensils to mechanical dishwashing should be carried out

in a quality agreement between the enamelling company and the customer.

4.25 Determination of the resistance to chemical corrosion by hot sodium
hydroxide solution
The determination of the resistance to chemical corrosion by hot sodium hydroxide should
be carried out using the methods as specified in EN ISO 28706-4/10 and EN ISO
28721-2/4.2.

4.26 Determination of abrasion resistance
The determination of the abrasion resistance should be carried out using the methods as

specified in ASTM C501. For some applications ISO 6370-1 and ISO 6370-2 can be used.

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