High quality functional circuit board is available in various types including aluminum substrate, FR4 board, and CEM-1 board. These classy functional circuit boards can be categorized based on technical processes such as copper etched circuit boards, rosin circuit boards, lead or lead-free spray tin circuit boards, OSP process, and gold process. Functional circuit board made in china.Additionally, they can also be classified by thickness ranging from 0.8mm to 2.0mm. Each type of PCB serves specific purposes and is chosen based on the requirements of the electronic application it will be used for.