EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: Rat_Patrol on June 23, 2023, 11:41:22 pm
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I have a 4 layer poly flex board that has an inner trace that needs repair, if at all possible. The trace in question has mechanical damage.
I thought about digging in with a dremel and abrasive brush, but I think a drop or two of the right chemical to clear the area would be much preferred since the copper is insanely thin. I've tried acetone already, does nothing.
Anybody know what dissolves the adhesive layer?
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https://www.mclpcb.com/blog/adhesive-vs-adhesiveless-polyimide-flex-core-material-types/ (https://www.mclpcb.com/blog/adhesive-vs-adhesiveless-polyimide-flex-core-material-types/) Says here acrylic or epoxy, but acetone should work on those.
It might be adhesive-free, in which case not much you can do with solvents AFAIK. https://www.pcbonline.com/blog/multilayer-flex-pcb.html (https://www.pcbonline.com/blog/multilayer-flex-pcb.html)
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You may need this kind abrasive brush https://www.aubibrush.com/silicon-carbide-moulded-deburring-disc-brush (https://www.aubibrush.com/silicon-carbide-moulded-deburring-disc-brush)
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The best solvent for most soluble adhesives is white spirits. I note you're in the USA so it might be called mineral spirits there. Its not turpentine.
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almost all the time when come to dissolving work, the nail polish remover is immediate
its most filler is acetone, precisely most are: Isopropyl acetone, methyl ethyl ketone, and n-methyl-pyrrolidone