Page 21 - 20250602 EEA QM Edition 6.0

Quality Requirements Edition 6.0 European Enamel Association

4.29 Determination of the quality of Aluminium for enamelling 4.36 Method for the packing of heat exchanger elements
The quality of Aluminium for enamelling should be pure Al > 99,5 %, Al or Al-Mn (Mn The method of packing of heat exchanger elements in baskets should be carried out
< 1,7 %) Mg max 0,01 %. For other alloys a test enamelling should be done before using the methods as specified in EEA Specification 8.7.8
production.
4.37 Determination of the resistance to long-term chemical corrosion exposure
4.30 Identification of defects for hot water tanks (non-destructive - visual only) to boiling water
The visual identification of defects should be carried out using the methods as The determination of the resistance to long-term chemical corrosion exposure to boiling
specified in DIN 4753; BS 3831 Appendix A; IVE Atlas of Defects. water should be carried out using the apparatus as specified in EN ISO 28706-2/6 and
the test method described in EEA specification 8.6.1.
4.31 Determination and measurement of protective current requirements for
hot water tanks 4.38 Determination of the resistance to chemical corrosion by drinking water

The determination and measurement of protective current requirements should be The determination of the resistance to chemical corrosion by drinking water should be
carried out using the methods as specified in DIN 4753. carried out using the methods as specified in EN ISO 28706-2/11, EN ISO 28706-1/9
and EEA Specification 8.6.2. Testing time is 48 hours and temperature 60°C.
4.32 Determination and control of release of elements for hot water tanks
4.39 Determination of the adherence of porcelain and vitreous enamel to steel of
The determination of the release of elements such as lead, cadmium, etc. should be
carried out using the methods as specified in DIN 4753 and the UBA-Assessment more than 3 mm thickness
Guideline for enamelled and ceramic materials in contact with drinking water. There The determination of the adherence of porcelain and vitreous enamel to steel of more
may be differing requirements for the limits for this specification dependent on national than 3 mm. Thickness should be carried out using the methods as specified in EEA
laws. (See also Clause 4.8). Specification 8.6.3.

4.33 Determination of the chemical corrosion rate in hydrochloric acid 4.40 Determination of thermal shock resistance of enamelled articles into water
The determination of the chemical corrosion rate in hydrochloric acid should be The determination of the thermal shock resistance of enamelled articles into water
carried out using the methods as specified in EN ISO 28706-2/13 and should be carried out using the methods as specified in EEA Specification 8.6.4.
EN ISO 28721-2/4.1.
EN ISO 28763 Annex A method may apply for some applications.
4.34 Determination of the crack formation temperature
The determination of the crack formation temperature should be carried out using the 4.41 Determination of thermal shock resistance of enamelled articles in an air-
methods as specified in EN ISO 13807. stream

4.35 Determination of the resistance to chemical corrosion by boiling sulphuric acid The determination of the thermal shock resistance of enamelled articles in an air stream
The determination of the resistance to chemical corrosion by boiling sulphuric acid should be carried out using the methods as specified in EEA Specification 8.6.5.
should be carried out using the methods as specified in EN ISO 28706-2/12.
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