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June 2001

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Subject:
From:
"Campbell, William (wcampbel)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 21 Jun 2001 09:21:12 -0400
Content-Type:
text/plain
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text/plain (52 lines)
You have a rather tall joint with a relatively heavy part.  SMT glue does
not have very much shear strength either.  Additionally, your CTEs of pcb
and part body are somewhat mismatched.  Without knowing more specifics,
there may be other things going on too.

-----Original Message-----
From: Lon Weffers [mailto:[log in to unmask]]
Sent: Thursday, June 21, 2001 8:50 AM
To: [log in to unmask]
Subject: [TN] FW: dispensing glue


Dear technetters,

One of my colleges has a problem with glueing a plcc on the solderside of
the pcb.
They glue with a Hereaus glue and when they check the joint directly after
the oven it is stuck.
When the pcb's are cooled down the component falls of the board.  The glue
spot is on the board.
What causes this problem??


Lon Weffers
Matas Electronics bv
www.matas.nl

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