Dave,
If you go through the trouble of chemical etching just one side then
you should do the whole job that way. It wouldn't take much more
effort to etch the desired image.
If you need dry film photoresist applied to your boards I can do that
for you. I use a DuPont laminator to apply 1.5 mil photoresist to
copper clad panels for etching.
If you coated one side of your two sided material the unwanted side
will etch clean and the coated side will have the image you want.
This is how we made single sided boards when I owned a commercial
plant. We always used double sided laminate since it was actually
cheaper than buying single sided material. One side was imaged and
then etched to leave them desired image and to remove the unwanted
side.
If anyone need dry film coated FR-4 or CEM-1 laminate contact me
direct for more information. This is the same type of photoresist
that Kepro used to supply.
Tom
--- In
Homebrew_PCBs@yahoogroups.com, "Dave Mucha" <dave_mucha@y...>
wrote:
> Hi all,
>
> I have a few sheets of 90 mil FR-4, (red imprint) that is double
> sided.
>
> I need to do a lot of 1 sided boards and instead of ordering one
> sided, I think I'll just etch one side of these to use the boards.
>
> Anyway, I mechanically etch boards so I need to remove the copper
in
> wholesale fashion and have no chemicals to do so.
>
> To make matters worse, the boards are 10 x 18.
>
> What is the simplest, lowest cost method to remove one side of the
> copper ?
>
> Also, I assume something like car or floor wax might make it easy
to
> add to the good side as a resist, but suggestions are welcome.
>
>
> Dave
> (I'm in southern NJ if someone wants to trade for some SS 1/16
> material.)