As you know, a multilayer PCB starts with a rigid core of Fr4 PCB. The internal core is processed for traces on those prior to the other fiberglass and copper being added, and the entire board is laminated together.
There is the B stage PrePreg, which is fiberglass that is still soft that will need to be heated in order to become rigid. It acts like a glue to keep the inner core adhered to the outer copper foil.
The copper foil added consists of very thin and loose sheets of copper. They are sandwiched together with the Prepreg and inner core, and placed in a PCB Lamination Press. Pressure and heat are applied to the material, which causes the Prepreg to “flow” and bind the layers together. Once it cools, the fiberglass is then hard and the entire board is very rigid.
Whether you need multilayer PCB or double-board PCB, we can provide you with competitive price.