home pcb making with HCL + H2O2
Tobias Wieler email (remove spam text)
I think the reputation of of the method is by far worse than the actual
risks. Many people make the mistake mixing by far too much of the stuff
at a time causing the need to store the used acid for next time.
Since the H2O2 will still keep producing gas the mixture cannot be
stored in a sealed bottle.
Just for my small job today I used 3 milliliters of the acid - so the
worst fume emission was getting the small amount out of the 1 liter
storage bottle. On all official warning sheets HCL is toxic and
corrosive - fully admitted - but I don't believe the rumor of HCL to be
carcinogenic. If chlorine was so bad, it would not be used for swimming
The smell I produced years ago when I had to heat up 1 liter or more of
acid in my etching-machine every time even for little jobs was by far
worse - at least what I remember.
> This is great fun to use ****BUT**** very very very nasty on your
> lungs. Said to be highly carcinogenic by some and, even if it's not, a
> whiff will tell you that it's not going to encourage your lungs to
> last longer. First rate ventilation absolutely mandatory. Failing that
> do it outside downwind of anything currently living. By far the best
> etchant I've seen, and one of the nastiest.
In reply to: <003201c56776$bd7b1850$d201a8c0@y2k>
See also: www.piclist.com/techref/pcbs.htm?key=pcb
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