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
2? "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
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