Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Solder Mask


PWH

#33819

Solder Mask | 21 April, 2005

We are currently building a board that has large pads that are for multiple SMT parts. There is no solder mask on the PCB in these areas to seperate the terminations of the parts. The parts tend to pull together in reflow. Can anyone recommend a good solder mask that can be applied by hand after print, reflowed, then removed/washed or maybe even a better way to handle building this design?

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py

#33827

Solder Mask | 21 April, 2005

conformal coating ?

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#33834

Solder Mask | 21 April, 2005

If spacing is not to small you could use a temporary peelable mask used in wave soldering. Or have your PCB manufacturer screenprint a peelable mask on for you. These suggestions are only if the mask needs to be removed, If not permanent solder mask would be the best solution.

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RDR

#33835

Solder Mask | 21 April, 2005

Dang Patrick, I'm going to have to agree with you again. The design needs to be corrected. This multiple footprint is a common thing nowadays but the designers need to understand the dynamics of reflow and such.

PWH - Why would this mask need to be removed after reflow.

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PWH

#33842

Solder Mask | 21 April, 2005

Not sure why - all I know is customer will not allow any foreign material outside of what was intended in design. These are large RF boards and maybe they are afraid this will attract contamination that will affect performance???

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URL

#33854

Solder Mask | 22 April, 2005

SMT adhesive works great! We actually cut stencils to print adhesive in between areas that always solder short over wave. It's the perfect solder resist.

Change a customers board? I thought only Satin could do that?

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steve

#33862

Solder Mask | 22 April, 2005

Hey Chunks, nice name by the way. SMT adhesive, I'm familiar with Loctite anyone else? Only because Loctite is expensive.

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reflow oven profiler

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