Page 116 - QRedition5.0 062021

Quality Requirements Edition 5.0 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:

kind and origin of the test plates Purpose and scope
place and date of testing Fittings, molded bodies, pipes and receptacles can get in contact with drinking, natural and
single weight losses and average treated water. The stress can be highly variable, according to water 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 bicarbonate-hardness, the tests take place at a
temperature of beneath 100 C.
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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’, ac-
cording 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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