of conductive and insulating layers. A basic printed circuit consists of a flat sheet of insulating material FR4, Rogers or Polyamide for flexible circuits, and a layer of copper foil, laminated to the substrate. Chemical etching divides the copper into separate conductive lines called circuit imprimat placa prototip tracks or circuit paths, pads for connections, metallized holes (vias)
Only the outer layers need to be covered with solder mask, the inner copper layers are protected by the adjacent substrate layers. The soldering mask soldermask is made of a fluid substance like an ink and is applied in a thin layer placa prototip circuit imprimat similar to varnish on the entire surface of
on the PCB board that can help users during assembly. It is used to mark component values, part numbers, test points, polarity, etc. Screen prototip placa circuit imprimat printing does not influence the printed circuit and the possible problems that may appear may be slight discolorations due to the high temperatures