Borosilicate aka pyrex.  COE33.  I have the appropriate torch and fuel/oxyg=
en.

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of=
 Sean Breheny
Sent: Tuesday, October 31, 2017 2:05 PM
To: Microcontroller discussion list - Public.
Subject: RE: [EE] Vacuum plumbing

What type of glass are you working with?  You will need to actually melt it=
, not just soften it. This will likely take an oxy-fuel torch - especially =
if you are using Pyrex  (and non-pyrex tends to crack when cooling so it is=
n't easier)

On Oct 31, 2017 2:45 PM, "Van Horn, David" < david.vanhorn@backcountryacces=
s.com> wrote:

> I discovered a source of valves, Kontes high vacuum similar to part=20
> number
> 826500-0004
> Not cheap, but less expensive on Ebay.
>
> Now I need to find some writing on how to put the plumbing together. =20
> The basics I know, but it's the "how do you hold all this in position=20
> while flaming the tubes" part that has me wondering.
>
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