I think the Tg continued to advance and the Dk and Loss also were
effected.
Jeffrey Bush
Director, Quality Assurance and Technical Support
76 Technology Drive - POB 1890
Brattleboro, Vermont 05302-1890
Tel. 802.257.4571.21 Fax. 802.257.0011
[log in to unmask]http://www.vtcircuits.com
-----Original Message-----
From: Phillip E. Hinton [mailto:[log in to unmask]]
Sent: Thursday, April 22, 2004 6:14 PM
To: [log in to unmask]
Subject: Re: [TN] PCBA at higher temperatures
George
I did the DK after both a temperature soak at 125oC and 150oC and the DK
dropped about 0.1 lower than the fresh sample in both cases. I assumed
that it had to do with driving out the moisture instead of any change in
the resin/laminate. The tests we were running were on boards that did
not have any interest in impedence control and the DK test was only for
curiosity and I do not know the frequency that the measurements were
made at. The soak time in both cases was 100 hours.
Phil Hinton
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