monolithic
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Glas-col sizes?
I need to heat 250, 500, and 1000ml RBFs. Ideally I would have a heating mantle for each of these but I want to keep costs down. Would a 1000ml
Glas-Col (O Series; 100A O408) work for all of them?
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happyfooddance
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Yes! You can put stuff around your flask to get better heat transfer and insulate as well (Al foil, Al shot, copper bb's, etc.).
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Mr. Rogers
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If you have a hot plate these are even better:
https://www.amazon.com/Asynt-DrySyn-Classic-Starter-500mL/dp...
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monolithic
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Those do look very nice, but I can't afford $600+. 
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Mr. Rogers
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Other companies re-brand this system like ChemGlass and they come up on Ebay from time to time at a substantial discount - like at around $100.
They're often sold by liquidators that don't seem to know what it is or how to describe it.
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Dr.Bob
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Some of the 500 ml mantles are flat and flexible enough to be able to wrap around a 250 but also flatten some to hold a 1000 ml rbf. Not saying
that it is perfect, but that is an alternative to using a 1000 ml mantle plus filler (sand, shot, ball bearings, etc). A lot depends on which size
you can find a good deal on.
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