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From: "Tom Del Rosso"
References: <firstname.lastname@example.org> <3DC14651.C34B82FE@mindless.com>
Subject: Re: Side effects of potting compound !
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
NNTP-Posting-Date: Fri, 01 Nov 2002 19:10:33 GMT
Organization: AT&T Worldnet
Date: Fri, 01 Nov 2002 19:10:33 GMT
"Jeroen" wrote in
> for some explosion sensitive environments potting is a method of
> explosion proof (EX-d certificates etc). At my previous job we potted
> things too (that company happened to be a specialist of explosion
> The purpose is that no sparks can get in or get out of the module. I
> never really a fan of potting.
In 1982, in the first prototypes of the Airfone system, there was a
little cigarette-pack-sized "ID box" which would go into the cargo hold.
It generated the ID number of the plane and sent it to the control unit
for broadcast to the ground prior to every call. The box was potted
because the ID box was a security measure and the ID numbers were
supposed to be secret. That makes no sense but that's why the
management wanted it done.
The FAA required that the potting must be inflammable, even though it
was small, and down in cargo with much more mass of flammable luggage,
and even though, at that time, they still allowed polyurethane foam in
the passenger seat cushions and all the suffocating black smoke it
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