>From scientific suppliers, it's 33 boro.

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of=
 mike brown
Sent: Tuesday, October 31, 2017 4:22 PM
To: Microcontroller discussion list - Public.
Subject: RE: [EE] Vacuum plumbing

Anything labeled pyrex is soda-lime glass, you surely mean PYREX.  Not real=
ly sure where Pyrex stands right now.

On Oct 31, 2017 16:03, "Van Horn, David" < david.vanhorn@backcountryaccess.=
com> wrote:

> Borosilicate aka pyrex.  COE33.  I have the appropriate torch and=20
> fuel/oxygen.
>
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On=20
> 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=20
> melt it, not just soften it. This will likely take an oxy-fuel torch -=20
> especially if you are using Pyrex  (and non-pyrex tends to crack when=20
> cooling so it isn't easier)
>
> On Oct 31, 2017 2:45 PM, "Van Horn, David" < david.vanhorn@=20
> backcountryaccess.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.
> > The basics I know, but it's the "how do you hold all this in=20
> > position while flaming the tubes" part that has me wondering.
> >
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