Normally we call PCB with finish copper weight (thickness) >=2OZ as heavy copper PCB(well some of the people prefer using 3OZ). The application of heavy copper PCB depends on specific copper weight.
So the question is "what is the advantage and performance of heavy copper PCB?
Performance
We could find many industries/electronics using heavy copper circuit board, such as home electronics, high-tech devices, military product, medical products and so on. PCB with thick copper has a good performance on extra high/low temperature resistant and anti-corrosion, which can extend the product life cycle. It also helps on reducing the volume of the electronics--especially on devices running high voltage and current.
Assuming the trace width does not vary, then increasing copper thickness equals to increase the section area of circuit, therefore it can run higher current. And also copper has a relatively lower electrical resistivity, which means the temperature go up only a bit when the current increases.
Application
Heavy copper PCB has been much popular in recent years, even some customers so prefer it!
Two major industries that need heavy copper circuit board is power module(so called big current base board) and automotive parts. For big current base board its main purpose is to help stablize the power supply unit, its future is to increase the ability to bear higher current--which will result in heavier copper. Is there anyone seeing that, 6OZ finished cooper is now normal in power supply PCB!
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