Werner,
How can Resin=30-40; Cu=17-18 and the combination=8?
Steve

-----Original Message-----
From: Werner Engelmaier [mailto:[log in to unmask]]
Sent: Wednesday, September 08, 1999 7:52 PM
To: [log in to unmask]
Subject: Re: [TN] FW: [TN] Woh Nelco.............


Hi Geoff & Paul, 
I do not know about N4000-2, 6 or 13, but I sure have measured enough FR-4.
The CTE for FR-4 resin (not laminate) is: 
CTE(<Tg) @ 30 to 40 ppm/°C, CTE(>Tg) @ 90 to 130 ppm/°C.
The CTE for FR-4 laminate is: CTE(x,y) @ 8±2 ppm/°C;
CTE(z,<Tg) @ 50 to 85 ppm/°C, CTE(z,>Tg) @ 240 to 390 ppm/°C
CTE(Cu) =17 to 18 ppm/°C,

Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 904-437-8747, Fax: 904-437-8737
E-mail: [log in to unmask], Website: www.engelmaier.com

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