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

You won't find "anhydrous" or 99% alcohol in a store.

90% is the highest you'll find isopropyl at.

Alcohols and water form what are called "azeotropes;
which is a solution that has a point during distillation
where both items begin distilling off at the same rate.

I.e. you can distill all you want after that, but the alc.
will never get any purer.

For ethanol, this is around 96% eth. and 4% water.

Can't recall the exact azeotrope ratio for isopropyl; but
it's in the same range. Given the fact that 90% iso is
common, but that one -never- sees higher than that;
I'll guess that the azeotrope is around 90%... <grin>

I generally use liquid dish-soap (as plain/unscented
as possible) with a 'harsh' 3M scrub-sponge; followed
by iso alc. cleaning. However, that's just for initial
prep prior to laminating dry-film resist on.

For stripping toner, you do quite likely need acetone.

MEK is another very effective solvent. VERY effective...<grin>.

It'll take the paint right off your car....so be forewarned...

Richard
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