Page 121 - 20250602 EEA QM Edition 6.0

Quality Requirements Edition 6.0 European Enamel Association

8.6.4 Determination of thermal shock resistance of porcelain and vitreous 8.6.5 Determination of thermal shock resistance of porcelain and vitreous
enamelled articles in water enamelled articles in an air-stream

Purpose and scope Purpose and scope

A lot of enamelled articles are subject to thermal shocks during usage. This This specification sheet describes a test procedure to determine the thermal shock
specification sheet describes the quenching stability which is not to be mixed up with resistance of especially heat exchanger panels. (For the thermal shock resistance of
the resistance to thermal shocks of cooking utensils or other holloware. The latter cookware and similar holloware EN ISO 2747 is valid).
applies to EN ISO 2747.
Test method

Test method
Enamelled plates out of production, sized DIN A4, are to be used for testing. They are
Small enamelled articles, cut-outs of utensils or test plates are to be used for this to be heated up to the required temperature (on air). Following the heating-up phase
test. These are to be heated up to the claimed temperature (on air) and immediately the test plates are to be kept at this temperature for 10 minutes and then cooled down
after that to be quenched (entirely immersed) in water of about 15 C. This process to ambient temperature by an air stream. This testing cycle has to be repeated 5 times.
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is to be repeated according to the quality requirements. Damage of the enamelling, No visual dam- age of the enamelling is permitted.
visible by the naked eye, is not permitted. There are at least three, preferably five
samples to be tested. Test device

No binding regulation
Test device

No binding regulation Test temperature

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For heat exchanger panels a testing temperature of 350 C is valid.
Test temperature

The quenching temperature is a matter of arrangement in each case. Test report

To be mentioned in the test report:
Test report
kind and origin of test plates
In the test report to be mentioned: place and date of testing
kind and origin of sample testing temperature and number of test cycles
place and date of testing
quenching temperature and number of quenching

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