It’s generally, 2.0 ~ 3.0 mm thick. As for some small electronic products, such as electronic watches, calculators, etc. Moreover, there is no need to choose such a thick plate, 0.5 mm or thinner is enough. Similarly, the thickness of the multilayer thick copper PCB printed board is related to the number of layers.
The thickness of the multilayer board with 8 layers or less can be limited to about 1.5 mm. The thickness of more than 8 layers should exceed 1.5 mm. Thickness of each circuit layer of a multilayer board is often determined by electrical design.
Printed circuit thick copper plates are common in power supply circuits. And their electrical performance has high requirements on high voltage resistance and inductance performance, except for certain materials. Simultaneously, the particularity also has many unique points in the production.
Most of the heavy copper PCB plates by most manufacturers have a copper thickness of less than 137um. For the production of heavy copper plates with a thickness of more than 172um. The production experience is relatively lacking.