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Re: [TCML] parker globe for sale

Are they really plastic?

 I know a Korean light bulb factory made a large quantity of small globes
for Radio Shack and WalMart, and Sharper Image, but I didn't know they
were plastic.  The ones I have seen have all been glass.  It's hard to
believe a plastic would withstand a bake cycle much less have a hot ionzed
plasma striking it without burning a whole in it.

Dr. Resonance

On Sat, Aug 22, 2009 at 1:51 PM, Ed Phillips <evp@xxxxxxxxxxx> wrote:

>   What about cleanliness of plastic  globes such as the cheapie I bought
> from Radio Shack?  At least 10 years old and still looks "as good as new".
> Ed
> 1 atmosphere = 760 Torr = 760 mmHg
> "Most plasma spheres operate in the range of 5,500 to 7000 microns.  Air
> being 7600 microns (no vacuum at all).
> I use xenon, argon, helium, krpton in my mixtures.
> The container cleaning is the problem issue.  You have to bake it at high
> temp for 24 hrs before filling.  Also, use a 60 kV discharge in Argon gas
> to
> microscopically "clean" all the residuals off the interior walls.  Failing
> to take this step can result in a fuzzy ball after a few months as the
> plasma dislodges molecules adhering to the glass internal walls.
> Dr. Resonance
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