Heavy copper PCBs — boards with copper weights of 3 oz/ft² and above, reaching up to 20 oz/ft² in extreme applications — are the backbone of modern power electronics: EV battery management systems, industrial motor drives, high-current power supplies, solar inverters, and aerospace power distribution units. They are engineered to carry currents that would vaporize a standard 1 oz board's traces. But that capability comes with a fundamental engineering challenge: heat. Every a
