masood alvi Posted April 30, 2012 Report Share Posted April 30, 2012 my friend is screen painter he does not know chemical name.he paste a chemical on copper clad then he put negative on it and expose to sun light after 5 minutes he get fine image on clad board.after this he emmerce itin fecl2 then the image destroy/dissolve .can any body hep me that how can i get fast image and pcb etch easily? thanks Quote Link to comment Share on other sites More sharing options...
Hero999 Posted May 1, 2012 Report Share Posted May 1, 2012 The chemical used to develop PCBs is NaOH. It doesn't need to be a strong solution, 0.6% will do.The substance used to coat the board before exposure to UV is known as a photresist. Many different chemicals are used, each having different properties, see Wikipedia for more information.http://en.wikipedia.org/wiki/PhotoresistUsing the sun to expose PCBs isn't very reliable. It's much better to use a popper light box which is easy to make yourself.Here's another site with more information on DIY PCBs.I mostly use the toner transfer process myself and when I do use the photo process I buy pre-sensitised copper clad board. Quote Link to comment Share on other sites More sharing options...
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