[labnetwork] Hydrogen Bromide Seal Compatibility

[Dennis Schweiger]

John,

Good morning.  I agree with Tom, wherever we've tried to use a CGA for a
HPM we've run into long term issues.  That's why all of our HPM gases
(except for Hydrogen, Methane, and Acetylene) are now DISS cylinder
connections.  They just work, each and every time.

Thanks,

Dennis Schweiger
University of Michigan/LNF
Facilities Manager

734.647.2055 Ofc


On Mon, Jun 7, 2021 at 8:03 PM Tom Britton <tbritton at criticalsystemsinc.com>
wrote:

> Hi John,
>
>
>
> Looks like the professor wants to upgrade to a high purity cylinder
> connection. For this type of gas (corrosives) I would strongly advise not
> using the adapter, but rather making a new pigtail with just the DISS
> connection, and avoid elastomeric seals totally. HBr loves water and really
> makes a mess if it sees any, even if it’s just trace amounts.
>
>
>
> We see many people replacing their regulators and/or gas panels due to the
> interaction of moisture with HBr, either during cylinder changes, or
> through the use of low purity purge gas. For our gas systems, we use all
> metal seals, DISS cylinder connections, and if the customer cannot
> absolutely guarantee 5-9s on their purge gas, a purge gas purifier. Set up
> this way, the interior of the process line, the panel, regulator, etc. will
> last a long time in service.
>
>
>
> If I can help in any way, just ask.
>
>
>
> All the best,
>
>
>
> Tom
>
>
>
> Tom Britton
>
> Director of Sales
>
> *Critical Systems, Inc.*
>
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> *From:* labnetwork <labnetwork-bounces at mtl.mit.edu> * On Behalf Of *John
> Nicholson
> *Sent:* Monday, June 7, 2021 11:33 AM
> *To:* Labnetwork <labnetwork at mtl.mit.edu>
> *Subject:* [labnetwork] Hydrogen Bromide Seal Compatibility
>
>
>
> *IRONSCALES couldn't recognize this email as this is the first time you
> received an email from this sender thejohnnicholson at gmail.com
> <thejohnnicholson at gmail.com>*
>
>
>
> *[EXTERNAL EMAIL]* This message originated outside of your organization.
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>
> I'm retiring this month after minding the UMass/Amherst clean rooms solo
> since 2008 and have a few last minute equipment configuration issues to
> complete.
>
>
>
> HBr has been added to our RIE system and the line fitting is a CGA 330
> while the tank ordered by a professor is a 634 fitting (nickel seals). I
> have a 634 to 330 tank adapter but am unsure whether the Teflon seals used
> with the 330 end would be compatible with HBr. Any advice would be
> appreciated.
>
>
>
> Best regards and thanks for the assistance over the years,
>
>
>
> --
> John Nicholson
> Nanofabrication Laboratory Manager
> Silvio O. Conte Center for Polymer Research, Rm. B111
> University of Massachusetts Amherst
> 120 Governor's Drive
> Amherst,MA 01003-9305
> Phone: 413-545-2772
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