Page 47 - QRedition5.0 062021

Quality Requirements Edition 5.0 European Enamel Association

7.11.3 Quality requirements

Test method Requirement Remarks Frequency
4.2 material thickness panels, space heating and continuous flow heaters
min. 0,70 mm determination during design
chimney inserts and -tubes, heaters, boilers for
central heating and air heating min. 0,90 mm
4.3 thickness enamel coating wall-grids, cladding panels, geysers combustion areas S4/AQL 6.5
max. 0.40 mm, chimney tubes and pipes,
heat-exchangers max. 0.30 mm
4.4 cold citric acid wall-grids and panels space heating: on test sheets conform EN ISO 28764 when taking into production a sig.diff.

not acid resistant upper side: class A on test sheets conform EN ISO 28764 enamel recipe, but at least 1 x a year
geysers: class A
combustion areas gas fired: not acid resistant
oil fired: class A
4.9 impact resistance at 20 N no damage > 2 mm diameter after 24 hours when taking into production a sig.diff.

enamel recipe, but at least 1 x a year
4.10 adherence min. 2 on test sheets may be conform in production 1 x a day
to EN ISO 28764

4.13 defects heat-exchangers normal: max. 20 defects/m not applicable for borders in production 1 x a day
2
according to method A not valid in case cermet is applied in production 1 x a day
heat-exchangers low temperature: not valid for borders
2
max. 20 defects/m according to method A not valid in case cermet is applied
4.21 resistance to heat when overloading of 50 °C above normal application application temperature determined in draft-stage and when
temperature after 48 hours no bubbles, chipping off, changing enamel recipe
melting or open palpable cracks
4.28 steel quality in accordance with norm EN 10209 is recommended: DC04EK determination during design
4.40 thermal shock resistance panels space-heating, geyser 250 °C (test 5 x), combustion the thermal shock resistance of the when taking into production a sig.diff.
areas gas fired 250 °C (5 x), oil fired 400 °C (5x) pieces is to be determined by heating to enamel recipe, but at least 1 x a year
heat-exchangers 350 °C (5 x) wall-grids: not applicable the temperature as recorded in the table
and afterwards cooled down in water

of 20 ± 2 °C
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