Hi Dave,
We use a thermal mechanical analyzer (TMA). The amount of change is so
small I think TMA is the only reasonable method for an accurate
readings. With TMA you can measure CTE before and after Tg and the
overall change of thickness at any temperature.
Most labs, our company included, can perform the test.
The real question is ... Why do you want to know CTE? The CTE
measurement is straight forward. The implication of the measurement,
particularly on reliability and the like, is very much convoluted.
Sincerely,
Paul Reid
Program Coordinator
PWB Interconnect Solutions Inc.
235 Stafford Rd., West, Unit 103
Nepean, Ontario
Canada, K2H 9C1
613 596 4244 ext. 229
Skype paul_reid_pwb
[log in to unmask] <mailto:[log in to unmask]>
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Connitt
Sent: Wednesday, January 21, 2009 6:34 AM
To: [log in to unmask]
Subject: [TN] method of calculating CTE of a rigid flex circuit board
Hello,
Does anyone know of a reasonably accurate way of calculating the overall
CTE of a 4 layer rigid flex circuit board?
Thanks,
Dave Connitt CID+
Printed Circuit Designer
L3 Fuzing & Ordnance Systems
A Wholly Owned Subsidiary of:
L3 Communications
3975 McMann Road
Cincinnati, Ohio 45245
Ph. 513- 943-2010 Fax 513-943-2288
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