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Re: Beryllium Oxide



Original poster: mercurus2000 <mercurus2000@xxxxxxx>

I somewhat doubt the correctness of that statement in that wikipedia article, all the new microwave ovens have pink insulators on the magnetrons I've taken apart while only the really old ones were white, I doubt with today's stricted enviromental regulations they would suddenly start putting BeO into the consume magnetrons.
http://lists.contesting.com/_amps/2002-09/msg00403.html
Adam
Tesla list wrote:

Original poster: "Breneman, Chris" <brenemanc@xxxxxxxxxxxxxx>

I think that sometimes BeO is used instead of that white ceramic insulator. From the wikipedia article on "Cavity magnetron", "Some magnetrons have ceramic insulators with a bit of beryllium oxide (beryllia) added-- these ceramics often appear somewhat pink or purple-colored (see the photos above)." One of the two photos above is a picture of a microwave oven magnetron, with a pink insulator. I actually finished taking apart a microwave oven today, and its insulator is purple-ish.
Chris


-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Sat 12/30/2006 10:17 PM
To: tesla@xxxxxxxxxx
Subject: Re: Beryllium Oxide

Original poster: mercurus2000 <mercurus2000@xxxxxxx>

Wait, common in microwave ovens? I've dissassembled over 50 microwave
ovens and never seen anything remotely resembling a BeO insulator,
are you referring to the white ceramic below the output antenna?
Adam
Tesla list wrote:

>Original poster: Mike <megavolts61@xxxxxxxxx>
>
>There IS a disposal issue, because you don't really want to poison
>the poor guys crushing your garbage in the truck.
>Jim could be right there....although I doubt they'd crush...there is
>still the possibility and that would just depend on how you
>feel.    I have worked in sevaral laboratories and one day, the
>janitor came up to me extremely worried....in the lab next to mine,
>they were sampling something with MTBE in it(gasoline oxygen
>additive for those who wonder).   His eyes were tearing and red  and
>he was near gasping for air.   It seems the person doing the
>analysis was pipetting sample then simply tossing the used pipets
>into the trash....when the janitor pulled the liner out...he
>inadvertantly compressed it, blowing the residual MTBE right into
>his face.    He was ok...and I created a stink the next day and from
>that point on...the used pipets were kept under a fume hood until
>thoroughly dried........
>Things can happen....I've handled a lot of those BeO
>insulators...they are common in microwave ovens and other similar
>uses.    Just have to be sensible about it all.
>Mike
>
>
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