Page 119 - 20250602 EEA QM Edition 6.0

Quality Requirements Edition 6.0 European Enamel Association

Testing report 8.6.2 Determination of the resistance to drinking water

In the testing report, the following has to be mentioned:
Purpose and scope
kind and origin of the test plates
Fittings, moulded bodies, pipes and receptacles can get in contact with drinking,
place and date of testing
natural and treated water. The stress can be highly variable, according to water
single weight losses and average
hardness and index of pH. The relevant temperatures are beneath the usual room
temperature. In this specification sheet a method is described, that tests the
resistance of enamels to the attack of such water. To test the influence of the
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bicarbonate-hardness, the tests take place at a temperature of beneath 100 C.

Method of testing

The prepared test plates are to be put into the corresponding casings and put into
the device according to EN ISO 28706-4, the enamelling towards the inside. The
device is heated up to the wanted temperature and filled with the water, that has
been heated up to the testing-temperature. The filling-capacity is about 320 ml. After
the agreed testing-time has passed, the device is to be emptied, the samples have
to be taken out, according to EN ISO 28706-4, and cleaned. Afterwards, the
enamelling has to face the ‘pencil-test’, according to EN ISO 28706-1.

Testing-time

If no further arrangements have been made, a testing-time of 48 hours is valid.

Testing-temperature

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If no further arrangements have been made, a testing-temperature of 60 C is valid.

Test plates
Two test plates or cuts out of devices have to be tested.

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