Tony:
 
We have used Fiberite, without issue, on Copper and Aluminum cores up to 0.180" thick.

Robert B. Denbo
Engineering Manager
Midwest Printed Circuit Services, Inc.
http://www.midwestpcb.com
mailto:[log in to unmask]
847.740.4120
847.740.4187 Fax
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of tony steinke
Sent: Wednesday, April 10, 2002 4:07 PM
To: [log in to unmask]
Subject: [TN] core fill

Hello Techies,
Can anyone tell me what type of reliable core fill materials are on the market.
I have been looking at the Howefilm and Fiberite, but both have some limitations. We have a .050 solid copper core to fill. And the Tg or operating temperature must be 170C or greater. 
Thanks in advance
Tony Steinke