I've recently checked into the thin laminate scene, and thanks to advice
from technetters, learned that several manufacturers offer thin core
laminate.  My experience has been good with Nelco.  Their distributor is
NLS Technologies (603)894-5804.  Core thickness (with fiberglass) is
available down to .002" in epoxy and polyimide.

http://www.parknelco.com/


At 07:19 PM 11/1/00 +0100, you wrote:
>I have been using a fr4 type material to make a substrate utilizing
>Constantan and Copper  for the metallic layers  for over 10 years. The
>thickness of the Fr4 is approx. 50 microns.
>There are thinner materials out there , but the handling becomes an issue.
>        The only way to process a very thin substrate with out the glass
>cloth in it is to modify the component make up of the polymer  to make it
>Flexible.
>
>Russ Smith
>
>
> ----------
>From: <[log in to unmask]>
>To: [log in to unmask]
>Subject: [TN] Thin FR#4 substrate
>Date: Wednesday, November 01, 2000 12:23AM
>
>Hi:
>     Is there anyone using very thin(thickness) FR#4 substrate instead of
>flex
>cicruit ? It may be kind of FR#4 without fibre glass enforcement. Any
>information are welcome.
>
>regards,
>
>Chan SL
>
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