In the circuit board production, the green oil bridge is also called the solder mask bridge and the solder mask dam. It is a “isolation band” made by the circuit board factory to prevent the short circuit of the pins of SMD components. If you want to control the FPC soft board (FPC flexible circuit board) green oil bridge, you need to control it during the solder mask process. There are two types of FPC soft board solder mask materials: ink and cover film.

The role of FPC flexible circuit board solder mask

1. Surface insulation;

2. Protect the line to prevent line scars;

3. Prevent conductive foreign matter from falling into the circuit and causing short circuit.

The ink used for solder resist is generally photosensitive, called liquid photosensitive ink. Generally there are green, black, white, red, yellow, blue, etc. Cover film, generally yellow, black and white. Black has good shading properties and white has high reflectivity. It can replace white oil black for backlight FPC soft boards (FPC flexible circuit boards). FPC soft board (FPC flexible circuit board) can be used for ink solder mask or cover film solder mask.