If you have to do it yourself, you can laminate two boards with epoxy
resin -- won't be fireproof anymore, however.
--- In Homebrew_PCBs@y..., JanRwl@A... wrote:
> In a message dated 20-Feb-02 11:00:13 Central Standard Time,
> jim.ubersetzig@l... writes:
>
>
> > How thick can you make a PCB ?
> >
> >
>
> Jim: I haven't "looked ahead" to see if someone with more cerebral
mass has
> already more intelligently answered, already, but here's MY
2ยข "hobby
> experience" worth toward this question:
>
> "FR-4", the Fire Retardent green epoxy-glass presently more common
than the
> previously-popular G-10 "same thing" comes in 1/64" through 1/8"
thick
> versions with NO copper at all, copper only on ONE side, copper on
BOTH
> sides, 1/2, 1.0, and 2.0 oz. "weights) (the copper-thickness; I
never learned
> how thick an "ounce" is!). The 1/8" is plenty tough! But if you
needed
> something as thick as 1/4", to drive Sherman tanks across (that'd
mess up the
> nicest solder-masks and PTH!!!), I THINK you would have to do one
of TWO
> things: Order some SPECIAL-made, or find who may have already
done so, and
> still has some on hand, he's willing to sell, or two, GLUE-UP some,
putting
> non-copper-sides together. I have never learned the howzits of
multi-layer
> PCB-makin', but in that, layers are heat-laminated in a 'spensive
press, once
> the inner-layers of copper are etched. Drilling is last. Whew,
a 'spensive
> mess!
>
> Anyway, the PRESS for glueing that up to make thicker (multi-layer)
boards is
> not only expensive, but incredibly powerful in terms of PSI on the
laminate,
> and I THINK they can also heat the layup. Find a jovial PCB firm
near yoy
> and go hassle 'em!
>
> Jan Rowland, old troll
>
>
> [Non-text portions of this message have been removed]