vacuum seal on experimental apparatus
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vacuum seal on experimental apparatus Permafacture 05-18-2009
Posted by Permafacture on May 18, 2009, 9:42 pm
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Howdy:

I'm planning an experimental apparatus. The part that i am asking
about here is a seal between a borosilicate chamber (with an inch or
so diameter opening) and small diameter metal tube. The chamber will
be evacuated by an adsorbent and may pull a very decent vacuum, I'm
not sure how strong (haven't built the thing yet). Also, The chamber
will be heated over a fire for several hours, with either a positive
or negative pressure inside (will vary between different
experiments). heating won't be right next to the seal or anything,
but in that time the seal would eventually get hot.

Anyone have any experience with glass/metal seals in these conditions?

much thanks,
elliot

Posted by charlie on May 19, 2009, 10:13 am
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> Howdy:
>
> I'm planning an experimental apparatus. The part that i am asking
> about here is a seal between a borosilicate chamber (with an inch or
> so diameter opening) and small diameter metal tube. The chamber will
> be evacuated by an adsorbent and may pull a very decent vacuum, I'm
> not sure how strong (haven't built the thing yet). Also, The chamber
> will be heated over a fire for several hours, with either a positive
> or negative pressure inside (will vary between different
> experiments). heating won't be right next to the seal or anything,
> but in that time the seal would eventually get hot.
>
> Anyone have any experience with glass/metal seals in these conditions?
>
> much thanks,
> elliot

i would think a high temp rubber or gasket material would work. there are
plenty around car engines, so there must be something available.



Posted by No Body on May 21, 2009, 12:55 pm
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>
>> Howdy:
>>
>> I'm planning an experimental apparatus. The part that i am asking
>> about here is a seal between a borosilicate chamber (with an inch or
>> so diameter opening) and small diameter metal tube. The chamber will
>> be evacuated by an adsorbent and may pull a very decent vacuum, I'm
>> not sure how strong (haven't built the thing yet). Also, The chamber
>> will be heated over a fire for several hours, with either a positive
>> or negative pressure inside (will vary between different
>> experiments). heating won't be right next to the seal or anything,
>> but in that time the seal would eventually get hot.
>>
>> Anyone have any experience with glass/metal seals in these conditions?
>>
>> much thanks,
>> elliot
>
> i would think a high temp rubber or gasket material would work. there are
> plenty around car engines, so there must be something available.
Depends on how hot he plans to go, and with what substances inside.



Posted by Permafacture on May 23, 2009, 7:53 pm
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300 C would be really hot. A hot engine temp is about as far as i
plan to go.

Contents will be calcium chloride/hydroxide and water. ammonia
resistance would be nice also.

Posted by No Body on May 25, 2009, 4:49 pm
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> 300 C would be really hot. A hot engine temp is about as far as i
> plan to go.
>
> Contents will be calcium chloride/hydroxide and water. ammonia
> resistance would be nice also.


what are you trying to make? C10H15N


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