Features of PCB Soldermask Dry Film

Standard print circuit board(PCB) utilize seldom solder mask, nonetheless, the SMT motherboard normally will make use of solder mask. Solder mask is a polyethylene product, primarily split right into 2 kinds, completely dry film and also damp film. This write-up will mostly present the favorable as well as unfavorable elements of a completely dry film.

 

Advantage of Dry Film

When the non-permanent solder mask is soldered in a wave, a wave will certainly undergo tooling openings in the motherboard to the non-welding surface area. For that reason, prior to the insertion of elements, the placing openings and also gold finger need to be concealed with a non-permanent solder mask and after that be liquified away throughout the cleansing.
A long-term solder mask is an essential part of the PCB board. It stops the bridges from attaching with each other while soldering in waves as well as likewise shield the circuitry from mechanical damages or chemical rust. Irreversible solder mask is split right into completely dry and also damp film. Dry film is water-based or solvent-based.
Dry film solder mask graphics has a high resolution, appropriate for high thickness electrical wiring boards, as well as can be properly straightened. So it will certainly not stream right into the openings in the motherboard. When the motherboard is examined in the needle bed, the vacuum cleaner needs to be utilized to draw the board to situate. What's even more, the completely dry film is difficult to be contaminated, to make sure that it will certainly not impact the dependability of welding.

Disadvantage of Dry Film

There are some unfavorable elements making use of completely dry film:

  • Externally of PCB boards, there are pads, lines, so the surface area is not smooth, as well as the completely dry film solder mask has no liquidity. So, in between the completely dry film as well as the surface area of the motherboard, there might be gas left. The gas obtains broadened when heated up, which might create completely dry film tear sensations.
  • Dry film is reasonably thick, normally the density is 0.08 ~ 0.1 mm (3 ~ 4mil). The completely dry film covering externally of the motherboard might trigger the balanced-out sensation.
  • Treating problems of completely dry film solder mask is extremely stringent if the treating temperature level is as well reduced or the healing time is also brief, after that the healing wants. It will certainly be influenced by the solvent while cleansing. If the healing is as well weak, it might fracture when subjected to warmth tension. What's even more, completely dry film solder stands up to has inadequate resistance to thermal shock, simple to obtain fractured in heat. The cost of completely dry film is high than damp film.

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