Heavy copper PCB refers to a layer of copper foil bonded to a glass epoxy substrate on a printed circuit board (PCB) with a thickness of 2oz or greater. In PCB prototyping, heavy copper PCB requires a specialized process, requiring a certain level of technical expertise and operational complexity, and are relatively expensive.

Heavy copper PCB' performance: They carry high currents, reduce thermal strain, and dissipate heat well. They are not restricted by processing temperatures, allowing for oxygen-blast welding at high melting points and resisting brittleness at low temperatures. They are also fireproof and non-combustible. Even in corrosive environments, the copper forms a strong protective layer. 

Heavy copper PCB is used in high-tech fields such as mobile phones, microwaves, aerospace, satellite communications, network base stations, hybrid integrated circuits, and high-power power supplies.