The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: email@example.com (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: <firstname.lastname@example.org> <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
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup