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 circuit stackup imprimat cu mark component values, part numbers, test points, polarity, etc. Screen printing does not influence the printed circuit
are called multilayer. PCBs can be single-sided (one layer of copper), double-sided (two layers of copper on both sides of an insulating board), or multi-layered (outer and inner layers of copper alternating with cu stackup circuit imprimat insulating layers). Among the multi-layer PCBs, the most common are the four-layer ones. The four-layer board has many more routing options in
the copper from corrosion and reduces the chances of solder shorting between traces or unwanted electrical contact with possible loose wires. For its function of helping to prevent solder shorts, the coating is called a solder mask. Soldermask is generally green in circuit cu imprimat stackup color but can have different colors: green,