Solder Mask (S/M) Solder Mask, Solder Mask, and Solder Mask Although the Solder Mask is more general, it is more like a Solder Resist. The so-called solder mask refers to the part of the circuit board surface that is not intended to be soldered. It is covered with a permanent resin film and not tinned. This layer is called S/M. In addition to solder masks, green paint can also protect and insulate the covered circuits.
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