Selecting PCB core thickness becomes a problem when a printed circuit board (PCB) fabricator receives a request for quotation of a multilayer design and the material requirements are stated either incompletely or not at all. This sometimes occurs because the combination of PCB core materials used is not critical to performance; if the overall thickness requirement is met, the end user may not care about the thickness or type of each layer.
Other times however, performance is more important, and thickness needs to be controlled tightly for the board to function at its best. If the PCB designer communicates all requirements clearly in the documentation, the fabricator will understand what is required and will set up the materials accordingly.
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