DFliyerz
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Steel/Glass Interface
I'm planning to try a distillation that involves molten sodium hydroxide, which would obviously destroy a glass RBF. What's a good way to get an
interface between ground glass and stainless steel, or does a company make stainless steel RBFs?
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aga
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This was a surprising find :-
http://catalog.hsmartin.com/viewitems/round-bottom-stainless...
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blogfast25
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Your best bet might be like a female (steel) / male (glass) ground glass type of joint. Not easy, I know. But a permanent, bonded glass/steel joint
would be very hard due to different thermal expansion coefficients, I think. Or a ball joint type of link...
Can you elaborate on your actual purpose?
[Edited on 9-6-2015 by blogfast25]
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BromicAcid
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For my attempts at CS<sub>2</sub> I took a female 24/40 joint and inserted it into a reducing adapter for a steel pipe. I used fireplace
cement which is mostly silicates (and bonds well to glass) to fill in the gap around the glass between the steel and then 'fired' it in my oven. When
it was done I screwed it on top of lengths of pipe whenever I needed a connection to my glassware. If you don't have a female 24/40 joint give it
time, something will break eventually.
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smaerd
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I can also vouch for fireplace putty.cement. It does what it's supposed to do, withstand high temperatures and create a seal. I have no idea how it
would handle at molten NaOH temperatures but a small scale test could be done and its very cheap.
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blogfast25
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How do you apply it?
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Funkerman23
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No kidding! I figure they won't sell to us amateurs but it couldn't hurt to ask. Those wound be very handy to have...
" the Modern Chemist is inundated with literature"-Unknown
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smaerd
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blogfast25 - it's just a gummy solid. When I used it I was destructively distilling sodium benzoate in a coffee can. I just gooped it around the
interface liberally. Didn't read the instructions I don't think there is a setting time or anything.
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Zombie
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There are a lot of 1400^f ceramic epoxies as well. They will remain flexible enough to tolerate differing expansions.
Just google High temp Epoxy. I use them very often in engine porting, and they hold.
They tried to have me "put to sleep" so I came back to return the favor.
Zom.
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blogfast25
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Zomb, if it survives the savagery a Nooow Yank Hillbilly undoubtedly puts his death by speeding on wheels machines through, it'll probably be
good enough for my humble causes! 
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Zombie
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Very likely indeed sir.
They tried to have me "put to sleep" so I came back to return the favor.
Zom.
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DFliyerz
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I think I'll definitely take this approach, especially considering that I have a three-way adapter with the bottom male part broken off. Boy, am I
glad that I saved that now!
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