Solder masks are referred to as solder stop masks or solder resist masks. They are thin lacquer-like layer of polymers, which are usually applied to the copper traces of a printed circuit board (PCB) for protection against oxidation. This lacquer-like layer lads to the formation of solder bridges between closely spaced solder pads. Liquid Photoimageable Solder Mask (LPISM or LPSM or LPI) is an electronic material of ... Read more
