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Old 07-29-2007, 10:54 PM   #1
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Default 5,000 ml yeast flask

Any idea what I should use for a magnetic stir stick? Besides a big stainless nail.

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Old 07-30-2007, 12:02 AM   #2
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It depends if you are trying to create a tornado like vortex or merely keep yeast in suspension and promote gas exchange. If it's the latter, then a 3" Teflon coated stirbar will suffice. I prefer the octahedral ones with the pivot rings like this one. You can find them online or from one of the science supply vendors on ebay.

BTW, the stainless nail won't spin.



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Old 07-30-2007, 01:33 AM   #3
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Try this place it where i got mine http://www.stirbars.com/
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Old 07-30-2007, 02:11 AM   #4
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Holy [email protected]! $50 minimum order for stirbars!?! Otherwise looks like it could be a good place to get them, but seriously...
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Old 07-30-2007, 05:37 PM   #5
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Cold worked 300 series stainless and 400 series stainless are magnetic. Whether they are sufficiently so to perform as a stir bar would be a neat experiment.

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