This Part of EN 13523 specifies the procedures for determining the thickness of an organic coating on a metallic substrate, using electrical measuring devices.
Two appropriate methods are given in this Part of EN 13523:
a) thickness measurement on magnetic substrate, for example cold rolled steel and metallic coated steel;
b) thickness measurement on non-magnetic substrate, for example aluminium and its alloys.
The methods are applicable only to products with smooth and flat substrates but the coating itself may be textured. In that case, the average of a series of readings will represent an average of the thickness of the organic coating.
The methods are not applicable for coating thicknesses less than 3 µm.