"A solder mask is a protective layer applied to printed circuit boards (PCBs). The main purpose of a solder mask is to prevent solder from spreading to unwanted areas during soldering. It covers the copper traces on the PCB, leaving only the solder pads exposed, where the electronic components are to be attached. In addition, it protects the PCB from oxidation, moisture and dirt, thereby improving the reliability and dependability of the printed circuit board.
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