Hi Paul,
From the information available to me;
Here's the low down on Nelco 4000-13:
Tg: 200C
Dk: 3.9
dissipation @ 1MHz: 0.009
CTE-Z:  40ppm
CTE-X&Y: 12ppm
Routing:
Feed rate: 60 ipm
Speed: 24,000 rpm
Tool size .093"
Here's the low down on FR-4 Getek Epoxy PPO:
Tg: 170C
Dk: 3.9
dissipation @ 1MHz:  0.011
CTE-Z: 45ppm
Feed rate: 60 ipm
Speed: 24,000 rpm
Tool size .093"
CTE-X&Y: 12ppm
Feed rate: 60 ipm
Speed: 24,000 rpm
Tool size .093"
Here's the low down on Polyclad PCL FR226 (FR-4)
Tg: 140C
Dk:4.5
dissipation @ 1MHz: 0.019
CTE-Z: 60ppm
CTE-X&Y:15ppm
Feed rate: 35 ipm
Speed: 35,000 rpm
Tool size .093"
I don't have any data available on the "stiffness" of these materials
however you can contact any of the major suppliers for further info.

Regards,
Mike Beckman
ATD DPD Substrate Design Integration
[log in to unmask]
Ofc. 602 554-4232



-----Original Message-----
From: PAUL BROWN [mailto:[log in to unmask]]
Sent: Thursday, May 20, 1999 10:59 AM
To: [log in to unmask]
Subject: [TN] Alternate PWB materials


Hi fellow techneters,
I would like to know if anybody can tell me the basic differences
between Nelco 4000-13, GETEK FR408 and standard FR4 (i.e. differences in
CTE, stiffness, electrical characteristics, process capabilities,
Tg.........ect). I'm willing to pay big bucks for the
answers.................well not really but I would certainly be
appreciative.

Paul Brown

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