PCB Solder Mask Materials: Selection and Design Guide
PCB solder mask materials are permanent polymer systems applied over copper to protect the board and control where solder can contact pads. Common options include liquid photoimageable solder mask, dry-film mask, liquid epoxy mask, flexible solder mask, and polyimide coverlay. In general, most production PCBs use liquid photoimageable solder mask, or LPI, because it supports […]