Glass to metal seal

I hope my question is within the topic of this group.
Could anyone tell me if glass tubing can be fused to stainless steel
tubing with a hermetic seal?
If so, are there special techniques/methods that need to be followed?
Would a scientific glass blower be able to do this.
Any advise appreciated.
Reply to
On Fri, 18 Jul 2008 02:11:27 -0700 (PDT), wrote:
Generally, the different expansion ratios between glass & metal make this impossible. However, there are glasses that have close COEs to metals. These are used to make what are referred to as "graded seals". They are available from scientific glass suppliers in most common tubing sizes, but not necessarily in a configuration that might suit you. Your best bet in that case would be to use an epoxy seal. There are special epoxies for this purpose.
HTH, Joe
Reply to
You might want to enquire with
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. Indium is used in solders which can be used to solder glass and to form glass to metal seals. It's not cheap though at least in small quantities last time I asked.
Reply to
David Billington
You might inquire with Randy Hansen in San Diego, he used to hang out here quite a while ago, haven't seen him in about a year, he runs his own Scientific Glass Lab and makes some really interesting pieces for working laboratories.
Reply to
On Fri, 18 Jul 2008 02:11:27 -0700 (PDT), wrote:
You can get threaded glass fittings that can be sealed to glass tube. The corosponding SS threaded fitting may also be available or may be machined.
Reply to
If your application were very low pressure, and the I.D. of the ss tube allowed the glass tube to fit inside, a good grade (Dow Corning 712?) of silicon would seal it.
There are also some mechanical setups that use a rubber gasket with lock nut. The nut squeezes the gasket around the glass tube, like the sight glass tubes they use to check the water levels in boilers.
Reply to
Bill Browne

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