IEC 60335-2-3 21.102. Hob surfaces of glass-ceramic or similar material shall withstand the stresses liable to occur in normal use.

Compliance is checked by the following test.

Heating sources beneath a surface of glass-ceramic or similar material are operated in accordance with the conditions of Clause 11 until steady conditions are established. After switching off, the hob surface is immediately subjected to the following test:

A vessel having a copper or aluminium base that is flat over a diameter of 220 mm ± 10 mm with edges rounded with a radius of at least 10 mm is uniformly filled with sand or shot so that the total mass is 4 kg. The vessel is dropped flat from a height of 150 mm onto the surface.

The test is carried out 10 times on any part of the hob surface but not within 20 mm of control knobs.