In PCB industry for thick-copper pcb (heavy copper pcb) people generally use the name to identify a printed circuit board with copper thickness more than 3 Oz in inner or outer layers and extreme heavy copper pcb refers to more than 15 Oz printed wiring board.
Why heavy copper is needed?Because enough thickness copper layer in the hole can ensure resistor value within requested range.Before electroplating,the hole should be clean with no burs.Check basal plate clearly of its number,technology file and technology instructions.Check electronplating area to make sure technology parameter stable and feasible.Confirm the safety of connecting parts,voltage and electron current fluctuated range.
Why heavy copper quality is needed to control?Precise plating area can ensure plating parameter stable and control the change of electron current.Check the thickness of copper layer to make sure if requires the technology.
As for heavy copper pcb technology,it is a complicated process.Strict control is needed during the whole process to decrease loss.It is good if the hole reflect metal color.Proper electronplating time will ensure the layer surface and hole will not turn black.Take care of the surface of heavy copper pcb while disassembling to make sure good quality of heavy copper pcb.
heavy copper printed circuit board