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and/or between layers of conductive substrate sheets. A printed circuit board can have several layers of copper which are almost always arranged in pairs. The number of layers and the designed interconnection between them PCB SADELEC (vias, PTHs) gives a general estimate of the complexity of the board. Using multiple layers

have different colors: green, red, blue, white, black. Only the outer layers need to be covered with solder SADELEC PCB 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 similar to varnish on

The color is usually white, although other colors are available: yellow, black, blue, red. Screen printing is used to render useful information on the PCB board that can help users during assembly. It is used to mark component values, part numbers, test points, PCB SADELEC polarity, etc.