Homebrew PCBs

Wow... according to the MSDS, this one is only 1 to 5% ammonia, if I'm
interpreting this correctly:
http://www.mchem.com/test/Pacific%20Ammonia.pdf

So you'd better water it down a lot more than that!

1 part 1 to 5% ammonia
4 parts 50% isopropyl
5 parts water

So... do the math.

It isn't incredibly critical, however if you use 1 part out of 10,
that is still about as strong as my undiluted household ammonia.

Steve Greenfield

--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan"
<stefan_trethan@...> wrote:
>
> 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
>