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Subject:	Insulcast RTVS curing problem (caused by latex gloves)
From:	Carl VanWormer <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Fri, 6 Jul 2001 07:40:40 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (43 lines)

We are potting an automotive application using Insulcast RTVS 27 (thermally
conductive potting compound) using room temperature curing.  An autopsy of a
failed unit showed areas of gooey (uncured?) compound around several
components of the assembly.  The gooey areas are up to 3mm deep, and will
flow slightly with gravity .

This particular assembly had been re-worked before (un-potted, fixed, then
re-potted).  The areas that were gooey were not the re-worked areas, but
were areas where the old potting material had been removed.  There has also
been a similar gooey effect around a Nitrile gasket.

The vendor suggests that latex gloves (worn during the handling/potting
operations) can cause the platinum based catalyst to become ineffective.  A
different compound with a tin catalyst (about twice the cost) will eliminate
the latex sensitivity.  We have been told to eliminate the latex if we are
going to stay with the existing compound.

We have also been told that Nitrile can cause similar results, but by using
higher temperature curing (oven), the potting compound should cure before
the Nitrile can cause a problem.

Has anyone else had similar experiences with this compound?

How about any better solutions?



Carl Van Wormer
Cipher Systems
1815 NW 169th Place, Suite 5010
Beaverton, OR  97006
Phone (503)-617-7447    Fax (503)-617-6550

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