Page 50 - QRedition5.0 062021

Quality Requirements Edition 5.0 European Enamel Association

7.12.3 Quality requirements

Test method Requirement Remarks Frequency
steel quality, construction and enamelling see DIN 4753 when taking into production
4.3 thickness enamel coating min. 0.15 mm 1 %
4.4 cold citric acid min. class A solution 10 % HCl when taking into production a sig.diff.

test duration 1 hour enamel recipe, but at least 1x a year
4.6 boiling water max. 8.5 g/m 2 testing time: 2 periods of 3 weeks, when taking into production a sig.diff.

on test sheets may enamel recipe, but at least 1 x a year
be conform to EN ISO 28706
4.9 impact resistance at 10 N no damage > 1.5 mm diameter after 24 hours on test sheets may be conform to when taking into production a sig.diff.

EN ISO 28764 enamel recipe, but at least 1x a year
4.10 adherence DIN 4753 on test sheets may be conform to in production 1 x a year
EN ISO 28764, fire conditions should be
specified.
4.28. steel quality in accordance with norm EN 10025 is recommended: S235J / S275J recommendation during design
in accordance with the new EN-design is recommended: S235EK1, S275EK1
“hot rolled enamelling steels for one-sided enamelling”
in accordance with EN 10111 is recommended: DD11

For certain non-critical parts, also qualities
DC02EK / DC04EK in accordance with EN 10209 are used

4.30 defects DIN 4753-3 100 %
4.31 protective current DIN 4753-3 Test done on tank capacities <1000L in production 1 x a day
requirements
4.32 physiological control UBA guidelines for enamels in contact with drinking Test done according to EN 12873-1 See § risk based testing program of the 4MS
water document on the Certification and approval of
products in contact with drinking water

4.40 thermal shock resistance 3 tests: 200 °C, repeat 5 x on test sheets may be conform when taking into production a sig.diff.
to EN ISO 28764 enamel recipe, but at least 1 x a year

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