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Re: Borosilicate Electrodes

Posted By: Howie Cohen
Date: Friday, 23 July 2010, at 1:14 a.m.

In Response To: Re: Borosilicate Electrodes (SVP Neon Equipment)

> The boro electrodes I have got from Eurocom
> seem to have a "shelf life",
> meaning: After they have been on the shelf
> for a few years the glass to metal seal
> starts to deteriorate. You can literally see
> it go from a nice gold color to blotchy
> brown spots and then almost completely
> brown/dark brown. I have done many custom
> hard glass to tungsten seals and this is not
> normal.

> With that said, all neon-type boro
> electrodes that I am aware of are a straight
> standard borosilicate glass to tungsten
> seal. I think this is where the problem lies
> (in addition to quality control). Standard
> boro is not the best choice of glass for
> this purpose. I use uranium (sometimes
> called "canary" glass by old
> glassblowers) for the glass to tungsten
> seal, then come back and seal the standard
> boro to the uranium. This seems to have a
> much higher success rate of a leak-free
> seal. High-end glass/metal feed-through's
> that are used in high temperature and high
> vacuum applications also use this approach.

Mark,
Any idea what one would pay for a stick of that Uranium/canary glass you are speaking of? If you would find it, what would it bring do you figure?

Howie

Messages In This Thread

• Borosilicate Electrodes -- BlueBeard -- Saturday, 10 July 2010, at 4:21 p.m.
  • Re: Borosilicate Electrodes -- Stephan Krasner -- Monday, 12 July 2010, at 5:41 a.m.
  • Re: Borosilicate Electrodes -- SVP Neon Equipment -- Monday, 12 July 2010, at 12:20 p.m.
    • Re: Borosilicate Electrodes -- BlueBeard -- Tuesday, 13 July 2010, at 12:35 a.m.
      • Re: Borosilicate Electrodes -- sean S -- Tuesday, 13 July 2010, at 1:50 p.m.
        • Re: Borosilicate Electrodes -- BlueBeard -- Tuesday, 13 July 2010, at 8:09 p.m.
          • Re: Borosilicate Electrodes -- John Anderson -- Tuesday, 13 July 2010, at 8:25 p.m.
            • Re: Borosilicate Electrodes -- SVP Neon Equipment -- Wednesday, 14 July 2010, at 12:05 p.m.
              • Re: Borosilicate Electrodes -- Howie Cohen -- Friday, 23 July 2010, at 1:14 a.m.

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