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Subject:	Re: Leadfree: PPM v/s % in Z-Axis Expansion
From:	Werner Engelmaier <[log in to unmask]>
Reply To:	(Leadfree Electronics Assembly Forum)
Date:	Mon, 14 Nov 2005 18:28:09 EST
Content-Type:	text/plain
Parts/Attachments:	text/plain (26 lines)

Hi Ken,
Unfortunately, "120 ppm/c (ambient to 288C)" is technical nonsense, because
it combine 2 regions with different CTEs. All you can conclude from this is
that from ambient [25C] to 288C [delta-T= 263C] there is a thermal expansion of
120e-6 x 100 x 263 = 3.16%



Regards,
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL 32174 USA
Phone: 386-437-8747, Fax: 386-437-8737, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com


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