Merely selecting a higher Tg material will not be sufficient to address
this issue. Experience has shown that outgassing of the laminate can
vary significantly and should be an additional consideration. Edward
Kelley/Cookson presented a paper at APEX 04' that addresses this issue
in some depth. Check those proceedings.
Rich Kraszewski
Advanced Manufacturing Engineer - KEDS
Phone: 260.925.8919
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of McCall,Doug
Sent: Wednesday, May 19, 2004 2:02 AM
To: [log in to unmask]
Subject: [LF] Pb-free and laminate Tg requirements
Hi,
What is the general thinking on the glas transistion temp (Tg) for FR4
being used for Pb-free PCBAs. I guess that the 'standard' is 140 deg-C
and is it sensible (and required) to go for a higher Tg?? Is it a good
idea to use a higher spec laminate??
Any thoughts will be very interesting.
Thanks,
> Douglas I McCall
> Printed Circuit Board Assembly Engineer,
>
> /// /// /// BOC EDWARDS
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> * +44 (0)1323 501147
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