piclist 2001\04\22\175447a >
Thread: PCB fabrication - broken copper trace problem
www.piclist.com/techref/pcbs.htm?key=pcb
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face BY : mikespamBeGone@whitewing.co.uk



On Sun, 22 Apr 2001 14:16:49 +0200, you wrote:

>On Sat, Apr 21, 2001 at 12:16:15PM +0100, Dave Selvester wrote:
>
>> The only other advise i would give is stay away from sodium hydroxide as the developer - awfull stuff(i'm sure others would concur)
>>
>So what could I use instead? (NaOH is recommended by the manufacturer of
>my photoresist. I dislike it too, because it is sold in big packages only,
>and deteriorates quickly due to CO2 absorption :-( )
>--
>          Wojtek Zabolotny
>          STOPspamwzab.....spamspamise.pw.edu.pl
Totally agree - NaOH, while cheap and readily available is pretty
awful stuff.
Use a silicate based developer - solution has indefinite shelf life,
it's not nearly as temperature sensitive, and has a huge margin
between developing and overdeveloping, so you can use it really strong
to develop PCBs in 10 seconds, but not ruin them if left for a couple
of minutes.  It is available from Mega and others in the UK, and there is also a
recipie to make it on my PCB making page
http://www.netcomuk.co.uk/~wwl/pcbs.html

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