Homebrew PCBs

On Fri, 30 Jul 2004 12:02:03 -0000, mikezcnc <eemikez@...> wrote:

> Stefan,
>
> I would like three issues answered by a chemist and or pharmacist
> (although here I suspect that argument would be made that since it is
> used for rubbing then it must be ok:
>
> 1. The web search reveals that IPA causes cancer.

Where, how? URL please. all three you provided do clearly state
it doesn't!!!!!

> We might get into
> semantics on that one,

No semantics, "no evidence" and "no indication" or similar, there is no 
point
in discussing the semantics, really!

> but we should not use an argument of rubbing
> alcohol being healthy, therfeore and the reason being that that
> discussion might turn in to medical subject which I won't get into. I
> know it is carcinogennic and if someone believes otherwise, I can
> respect that.

The acid in priduction is carcinogenic, not the alcohol. I could not find
the slightest hint suggesting that other than your opinion.

>
> 2. Tinnit says: it contains "acidic tin salts, although it
> doesn'tcyanide or other highly poisonous materials it is a skin and
> eye irritant- do not eat or drink". I realize that keeping it in the
> fridge is not for anybody else than me. Fridge is for food only, but
> since it is my fridge then I issued yself a waver from that otherwise
> strict regulation. Now, Stefan, aside how bad that stuff is to our
> helth, you made me think that if it works on copper traces, will 'go
> into the holes'? I would say it will go into the holes ONLY if the
> holes are copper plated.... But for that is the method of using H2S04
> and CuSO4 with DC current or like Jeremy suggested (better yet)
> use 'flash copper' rather than acidic copper... Tinning with that
> stuff brings awsome results, but there are some rather smallish fumes.

maybe, i dunno.
The last time i looked at flash tin it contained thiourea which is really
carcinogenic (the msds says so).

>
> 3. I would like a chemist to tell us how does IPA clean, because it
> does not dissolve oils nor fats. And if it doesn't then what kind of
> principle is applied for cleaning with it?

I believe it does solve oils and fats.
I'm not sure i admit.

ST