Glass to metal seal

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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.

Steven

Re: Glass to metal seal
On Fri, 18 Jul 2008 02:11:27 -0700 (PDT), snipped-for-privacy@beejewel.com.au
wrote:

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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

Re: Glass to metal seal
snipped-for-privacy@beejewel.com.au wrote:
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You might want to enquire with http://www.indium.com/ . 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.

Re: Glass to metal seal

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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.



Re: Glass to metal seal
On Fri, 18 Jul 2008 02:11:27 -0700 (PDT), snipped-for-privacy@beejewel.com.au
wrote:

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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.

Jack

Re: Glass to metal seal
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.

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