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From: firstname.lastname@example.org (Bob Wilson)
Subject: Re: Side effects of potting compound !
Date: Sat, 02 Nov 2002 04:30:14 -0000
Organization: Your Organization
X-Newsreader: WinVN 0.99.9 (Released Version) (x86 32bit)
References: <email@example.com> <3DC14651.C34B82FE@mindless.com>
In article ,
>"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
Ah, yes. The Airfone! The company I was with in the 80's was soing some
design work on the thing as well. It seemed half of GTE owned companies were
somehow involved with it. Mostly I recall the 20,000 RPM mini-fans that some
of the modules used, that had a VERY low life expectancy due to their high
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