RE: NEON- soda vs. lead glass

To: "'neon-l@lists.io.com'" <neon-l@lists.io.com>
Subject: RE: NEON- soda vs. lead glass
From: Dmitrij Gancho <neon@aiva.lt>
Date: Sun, 17 Nov 1996 23:04:55 +-200
Reply-To: neon-l@lists.io.com
Sender: owner-neon-l@io.com



>Am guessing, but Molybdenum glass is probably Aluminosilicate glass over
>here, which matches the expansion coefficient of Molydenum (Mo) and Tungsten
>(W) (Wolfram to you Europies) very well at 42 ppm/C and forms direct seals to
>those metals when they are oxidized. Chemically, it replaces Boron Oxides in
>Pyrex with Aluminum Oxides, for the most part. It is the most refractory
>glass, temperatures far above pyrex, but below quartz and can sustain
>temperatures up to almost 1000 C as I recall. And of course, if you want to
>work with very refractory and durable electrode parts operating at high
>instantaneous currents or voltages such as tungsten or molybenum it is very
>convenient because it forms a direct seal with those materials. I used it to
>make super flashlamps a while back. It can only be worked in a highly
>reductive flame, very little oxygen but is a super material when you learn to
>work with it.
>Jeff Golin

Thank you Jeff for the reply,

I will consult the bender who works with it, but as I recall it does not need temperatures above 1000 C to work with. I even tried to seal it once to a lead glass tube -- with no crack -- using hand torch without oxygen. It does seal to Molibdenum and Wolfram (Tungsten) and is used in almost all chemical glasswork here.

Actually I wonder if this glass can be used for neon with lead glass trodes, as there are tons of it overhere.

By the way, can anyone type out a cumulative table with main properties of lead, lead free, soda, and colour glass. Might be convenient to have it on someone's site for references. What do you think, Kenny?

regards,
dmitrij

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