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July 2006

Leadfree@IPC.ORG

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Subject:
From:
Michael Taylor <[log in to unmask]>
Reply To:
(Leadfree Electronics Assembly Forum)
Date:
Tue, 11 Jul 2006 13:10:45 -0600
Content-Type:
text/plain
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text/plain (66 lines)
I understand at least one dicy cured material (NPG-170TL) is adequate
for multilayer lead free assembly.  It is halogen free and lacks the
tetrabromo bisphenol A and sports a >165C Tg and similar Td, T260, T288
specifications as non-dicy materials.

Mike Taylor
Dynamic Details Inc.
2120 Miller Dr.
Longmont, Colorado 80501
303-682-1675 X209


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-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of Werner Engelmaier
Sent: Tuesday, July 11, 2006 1:05 PM
To: [log in to unmask]
Subject: Re: [LF] Price premium for Tg = 170 Deg C?


Hi,
The reason why for thicker PCBs Tg's of 130 or 140C are inadequate is
because
of the large alpha-2-CTE for a much larger delta-T [270-130=140 vs.
270-170=100C]. this can make the difference between PTH barrels cracking
or surviving
the soldering processes.



Werner

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