Though there is no standard definition of heavy copper PCB, any board with three or more ounces in the inner and outer layers is classified as a heavy copper printed circuit board. All boards with a copper thickness of more than 4oz per square foot are also grouped under this category.

As PCB manufacturer China know that, with the rapid development of the electronic information age, the demand for advanced boards, such as high-power and large-current server power, has rapidly grown. More importantly, these power PCBs must have high-heat resistance and heat distribution capacities.

Thick copper PCBs are divided into three classes: single-layer thick copper PCB, double-layer thick copper PCB, and multilayer thick copper PCB.