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Old 21st May 2019, 4:40 pm   #6
Aerodyne
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Join Date: Jun 2004
Location: Hampton Vale, Peterborough, UK.
Posts: 1,698
Default Re: PCB production using toner transfer

I need to draw the attention of forum members to an omission in the video (link on the top entry). I suggest the use of plumber's flux when protecting copper tracks from corrosion. Nothing wrong there. However what I omitted to mention was the need to remove all traces of flux after the board is completed. Plumber's flux is corrosive. This was pointed out to me by my good friend David but I was rather ashamed to admit that I knew it! My only defence is that the video was rushed, though I know that is really no defence at all. There is also a further complication if flux is left on the PCB because is is slightly conductive, so if you have adjacent tracks carrying differing voltages, arcing can occur.
So, to sum up, remove the flux either by washing with hot water and a good washing up liquid or similar product, or use a solvent such as Acetone.

Tony
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