Most resins of that type should be compatible with FR-4 which is epoxy
based.
It appears that there isn't a peak exotherm, so you're probably OK
during application.
I'm not sure what components are in your modules and where in an
automobile it will be placed or the durometer of the resin but CTE
mismatch could wreak havoc on the field reliability. Particularly if
under the hood.
PVC wires are normally not a problem. Pay attention to how the potting
settles around the wires. It may not bond to the wires at all. This
could allow a moisture path along the wires to the circuit.
Where the wires emerge from the potting there may be a thin sharp edge
of potting. This could damage the wires during vibration.
Regards,
LS
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Colin Weber
Sent: Wednesday, September 26, 2007 11:37 PM
To: [log in to unmask]
Subject: Potting Mix (O.T)
Hello,
I wish to pot a small automotive module for which I am assembling
very small volume.
I used what was on hand, a fibreglass polyester resin, for my first
prototype without
incident.
Can anybody comment on the appropriateness of continuing to use such
resin as while
this is somewhat of a backyard exercise for some ignition modules,
for which I found the
resin readily available and cheap, I am keen to pursue reliability. I
have no knowledge of
whether such a resin has any negative influence on electronic
components, FR4 board
and PVC wires. The alternative Dow corning materials seem rather
expensive.
Cheers, Colin
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