Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Hi,

went to get the ingredients today.
The ammonia is 25%, so i will have to dilute that down. Was only 4,35eur
of which over 1eur i think is the bottle, so i got a whole liter. I was
stupid enough to have a smell - a careful one from a distance _i thought_.
That stuff almost knocked me over! I was lucky not to spill anything from
the bottle - would have been a nice addition to the carpet that stench! It
felt like someone had stuck a knife up my nostril, _don't_ do that, you
don't need to know how 25% ammonia smells ;-). No wonder they used it for
smelling salts, that must wake the dead!

Anyway, back on topic. I have the ammonia, the IPA, and the distilled
water.
Am i right in the assumption that i need 400ml of IPA, 30-50ml of 25%
ammonia or thereabouts, and the rest to 1000ml water?

I would have had it mixed up in the shop but i didn't remember the
percentages. I assume there is nothing i need to watch, no reactions or
any special order?

Let me know if this sounds right. Also let me know if this is "normal
strength" and if there is any point in having "half strength" and /or
"double strength" or any other variations that you found useful.

Thanks for the recipie, windex or equivalent would have been damn hard to
get, and this is probably loads cheaper as well, and i get it in the
standard bottles which looks much nicer in storage ;-)


BTW i spied a drawer labeled colophony while i was in the chemicals shop.
Had a look for the color and it is great very light colored stuff. That
will make fantastic "no clean" flux for sure. The junk the electronics
stores sell is dark as tar in comparision. And with something like 4.50
for a pound (as you guys would call it) it is _a lot_ cheaper than from
the electronics stores...

Anyway, Steve, thanks for confirming the percentages.

ST