The cover coating layer is a transparent and elastic coating over a flex circuit board. It covers and isolate conductive areas of a circuit pattern and helps in smooth electric conductivity across the board.
Some essential functions of cover coating are, to:
- Protect conductors from the surrounding corrosive constituents of the environment
- Insulate on-board conductors electrically
- Strengthen solder coating areas for component assembly
Cover coating can be either of the two following categories:
1. Cover layer - It is a layer of adhesive coated film. The film is laminated to the conductive pattern via temperature or hydraulic press.
2. Covercoat or solder mask - A solder mask is a lacquer polymer coat that provide long lasting protecting cover over the flex circuit components. Three most popular varieties of solder masks are, screen printed solder mask, liquid photoimagable (LPI) soldermask (screen printed, roll coated or spray coated), and dry film photoimagable soldermask (semi-cured liquid mask applied as a film roll).
Of the two coating varieties, screen printed solder mark is the most cost-efficient widely popular option available today.
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