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December 2003

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Subject:
From:
Tom Parkinson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 31 Dec 2003 10:23:44 -0500
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We're a CM and building an assembly using a potted transformer. One of our
steps in the manufacturing process after aqueous washing is to put the
assemblies in a dry heat oven at approximately 180 degrees F for 2 hours to
ensure any water left over from washing is evaporated.
This is the first time we have seen where a potted transformer has leaked
the epoxy filling after being dried, and in some cases, has swollen the
plastic housing that the transformer is encased in.  We double checked the
temp. Is this something anyone else has seen? Should we have a lower
temperature???

Tom Parkinson - Quality System Manager
WinTronics, Inc.

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