Page 21 - QRedition5.0 062021

Quality Requirements Edition 5.0 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 The method of packing of heat exchanger elements in baskets should be carried out using
Al-Mn (Mn < 1,7 %) Mg max 0,01 %. For other alloys a test enamelling should be done the methods as specified in EEA Specification 8.7.8
before production.

4.37 Determination of the resistance to long-term chemical corrosion exposure to
4.30 Identification of defects for hot water tanks (non-destructive - visual only) boiling water

The visual identification of defects should be carried out using the methods as specified in The determination of the resistance to long-term chemical corrosion exposure to boiling
DIN 4753; BS 3831 Appendix A; IVE Atlas of Defects. water should be carried out using the methods as specified in EN ISO 28706-2/14 and 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 carried
The determination of the resistance to chemical corrosion by drinking water should be car-
out using the methods as specified in DIN 4753.
ried 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 Lead and Cadmium release for hot water tanks

The determination of the release of lead and cadmium should be carried out using the
4.39 Determination of the adherence of porcelain and vitreous enamel to steel of
methods as specified in DIN 4753 and the UBA-Assessment Guideline for enameled
more than 3 mm thickness
and ceramic materials in contact with drinking water. There may be differing requirements
The determination of the adherence of porcelain and vitreous enamel to steel of more than
for the limits for this specification dependent on national laws. (See also Clause 4.8).
3 mm. Thickness should be carried out using the methods as specified in EEA
Specification 8.6.3.
4.33 Determination of the chemical corrosion rate in hydrochloric acid vapour

The determination of the chemical corrosion rate in hydrochloric acid vapour should be
4.40 Determination of thermal shock resistance of enamelled articles into water
carried out using the methods as specified in EN ISO 28706-2/13
and EN ISO 28721-2/4.1. The determination of the thermal shock resistance of enamelled articles into water should
be carried out using the methods as specified in EEA Specification 8.6.4.

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-
stream
methods as specified in ISO 13807.
The determination of the thermal shock resistance of enamelled articles in an air stream

4.35 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.
The determination of the resistance to chemical corrosion by boiling sulphuric acid should
be carried out using the methods as specified in EN ISO 28706-2/12.
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