Hi James

I hadn't heard that it was possible to ground/bond non-conductors. How
is this done?

Thank you
Dave Lane

On 7/13/23 6:45 AM, James Kaufman wrote:
> There are several ways to ground and bond plastic and glass containers.
>
> Please contact me directly for more information ... Jim
>
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> On Wed, Jul 12, 2023 at 1:31 PM Alyssa Brand <abrand**At_Symbol_Here**lbl.gov> wrote:
>
>> Let me preface this with: I am no expert in the safe use of hydrogen gas.
>> But I wonder why a balloon would be used rather than a dedicated, regulated
>> gas line. My main concern with this would be the potential for ignition of
>> the hydrogen due to a static electricity discharge, and I would think that
>> using plastic components might not only increase the risk of a static
>> discharge occurring, but prevent the use of bonding and grounding. If I'm
>> entirely off base, feel free to ignore me. As I said, not an expert.
>>
>> Alyssa
>>
>> On Fri, Jul 7, 2023 at 10:54 AM davivid <davivid**At_Symbol_Here**well.com> wrote:
>>
>>> We do hydrogenations and hydrogenolysis in our lab in quantities of up
>>> to several moles. The equipment is assembled in a hood. Hydrogen is
>>> plumbed into the hood via 1/4" polyethylene tubing cable tied to the
>>> drop ceiling from tanks located elsewhere in the lab. The hydrogen
>>> regulator is set to deliver the lowest feasible pressure and the outlet
>>> valve set to deliver the lowest feasible flow.
>>>
>>> The assembled equipment is charged with the reactants and solvents then
>>> evacuated using a small diaphragm pump in the hood through a stopcock. A
>>> two-way stopcock can be used but a three-way stopcock is preferred as it
>>> does not require disconnection of the tubing from the system when
>>> switching between evacuation and fill. Hydrogen is then let into the
>>> evacuated system via the stopcock and fills the balloon. The hydrogen
>>> flow can be shut off at the system using the stopcock. If desired, the
>>> evacuation and fill procedure can be repeated multiple times to flush
>>> residual air from the system.
>>>
>>> We use mylar balloons from the Dollar Store as they are more capacious,
>>> stronger, less permeable, and more solvent resistant than rubber
>>> balloons. If you go this route you will need to fit the tubing several
>>> inches into the mouth of the balloon to reach past the internal valve.
>>>
>>> The attached photo shows the method we use to connect the balloons to
>>> the system. A gas inlet adapter is fitted with Tygon tubing which then
>>> connects to 1/4" polyethylene tubing. The joint between the two types of
>>> tubing is secured by two wraps of cable tie and sealed with grease. The
>>> tubing extends into the balloon to the point indicated by the arrow. The
>>> joint between the balloon and the 1/4" line is sealed with grease and
>>> fastened by wrapping several times with the ribbon from the balloon.
>>>
>>> Best regards
>>> Dave Lane
>>> Chief Science Officer
>>> Artisyn Laboratories
>>>
>>>
>>>
>>> On 7/6/23 12:27 PM, Laura Cunningham wrote:
>>>> Hi all,
>>>>
>>>> Does anyone have recommendations on how to *safely* fill a balloon with
>>> hydrogen? The hydrogen tank in this scenario is in an open lab, and the
>>> hydrogen filled balloon is for a hydrogenation reaction. The gas tank is
>>> located close enough to a fume hood that piping the hydrogen into the fume
>>> hood might be feasible. Wondering what other people’s experiences have been
>>> with this.
>>>>
>>>> Thanks,
>>>> Laura
>>>>
>>>> Sent from Proton Mail for iOS
>>>>
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