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Date: | Fri, 26 Jan 2001 08:28:27 EST |
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Hi Mark,
Below Tg the CTE(x,y)=17+/-2 ppm/C with CTE(x) and CTE(y) differing by about
1 to 2 ppm/C; CTE(z)=50 to 85 ppm/C, depending primarily on resin content.
Above Tg CTE(x,y) may actually drop slightly; CTE(z)=240 to 390 ppm/C, again
depending primarily on resin content. Measuring the CTE(z) over a temperature
range that straddles Tg is nonsense, because you get some mixture of the
respective CTEs below and above Tg that is dependent on the position of Tg
within that rather arbitrary measurment range.
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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