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Re: NEON- soda vs. lead glass
In a message dated 96-11-16 19:51:36 EST, you write:
>
>>Also, here we have so called "molibden glass" used in laboratories. Anyone
>know if it can be used for neon work?
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
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