conducter
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Brand new glass sep funnel with glass valve
i have a brand new 125mL 19/22 seperatory funnel.
Now the valve for it is also made from glass and ground glass. Most of the ones ive seen use Teflon, am i suppose to use Visine or some other
lubricant when i use this for seperating chemicals?
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not_important
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yes :
http://www.sas.org/E-Bulletin/2002-09-20/labNotesCoyne/body....
search for stopcock grease with google or whatever.
Simple greases can dissolve in solvents, a little care in use is required. An older lab methods textbook should have a section on all of this.
Before fluorocarbons researchers would sometimes use a mixture of bentonite clay and glycerol or syrupy phosphoric acid as a lubricant on stopcocks.
Those liquids will not dissolve in many organic solvents, and the clay will form a gel with water.
[Edited on 4-5-2007 by not_important]
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dedalus
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Oh, man. Be careful. Get some good silicone grease and use it. Ground glass joints will freeze up, esp. if you get some alkali in them, and they
become, like FUSED.
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conducter
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how bout dow corning grease? I believe i read that that is the best of the best.
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roamingnome
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hahha
i felt like you when i snaged my china dual 1 liters, so proud of them
but your glass joint and nut wont brake down like the non-teflon screw that was holding the teflon stopcock snug.
some funky solvent just split the nut in two, leaking stuff all over the place.
i assume they are millimeter threads and should be easy to tap but dam
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