RE: Semi-OT: Plasma globes - type of glass?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Mark R Dunn" <teslamark@xxxxxxxxxxxxx>


Thomas:

It's likely Borosilicate(ie Pyrex).  Sounds like the fill tube is broken.
The fix is not trivial and needs to be performed by an expert glass-blower.
Otherwise you risk breaking the globe due to differential expansion of the
glass by uneven heating.

Mark



-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Friday, April 27, 2007 10:56 PM
To: tesla@xxxxxxxxxx
Subject: Semi-OT: Plasma globes - type of glass?

Original poster: "Thomas Coyle" <zxcasd@xxxxxxxxx>

Does anyone have any idea what type of glass is generally used in
plasma globes? I have a relatively large globe (around 14" diameter)
that I bought on Ebay a year or so ago, and I'm about to have some
time to start playing with it. The catch is that it's broken on the
base. I've toyed with glasswork and shouldn't have any problem fixing
it, as long as I can pick a glass with the same or near-same
coefficient of thermal expansion (COE). Any suggestions?