GammaFunction
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Are these Keck clips?
Picture: http://i.imgur.com/YvLxE0C.jpg
It's hard for me imagine how they would attach. They resemble some metal clips I've seen but are not identical.
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cyanureeves
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they sure do look like keck clips but all them put together spell out " allah is great" where did you get those because they are expensive. i have
been thinking about buying a pair because i ruin at least one every time i distill nitric acid.
[Edited on 6-11-2013 by cyanureeves]
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Endimion17
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Don't use keck clips when you distill volatile mineral acids, it's simple as that. Keck clips are used to ensure that some parts of the apparatus
don't fall off and not for stopping fumes escaping the joints.
You use Keck clips between the cooler and the receiver and the receiving flask and the receiver, that's basically it. The clamps and the stands should
take care the rest is tight.
(BTW I love the spelling reference, good one, you earn One Internet  )
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GammaFunction
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Yes, they look like Keck clips, but there are similar clips available for ball joints. So I'm wondering if anyone recognizes this particular shape.
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Lambda-Eyde
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Quote: Originally posted by GammaFunction  |
Yes, they look like Keck clips, but there are similar clips available for ball joints. So I'm wondering if anyone recognizes this particular shape.
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I'm not sure if they're called Keck clips, but they're certainly used for the same purpose. I purchased one like that because I needed a metal #24
clip, and this style was the only one sold individually. IMO they're inferior to "modern" keck clips, they're a pain in the ass to use and can scratch
up your glassware.
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Dr.Bob
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Yes, these do the same function as Keck clips, their advantage is that they are more resistant to certain solvents and also to higher temps. If you
are heating your glassware to higher temps, the Kecks will melt, I have done that, so be careful, I try never to depend on them holding the apparatus
together, especially under weight (eg, don't hang a flask on the vacuum adapter, then fill it with 500 ml of DCM and expect it to hold the weight.)
But for most uses, the plastic ones are fine and less scratching.
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ElizabethGreene
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If scratching is a consideration, you could cover these in Plasti-Dip. http://www.plastidip.com/home_solutions/Plasti_Dip
When/if something eats away the coating you can always re-coat it in the future.
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jock88
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Can you upload a picture of just one?
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Lambda-Eyde
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Google can help with that: http://sciencesupply.com.au/shop/504-thickbox/keck-clips.jpg
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Sublimatus
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I've got a handful of those wire clips. I bought them because eventually the plastic ones develop cracks.
I've never been able to get them on the joint. The wire is very stiff. Perhaps they weren't made to the right specification, or my joints are odd.
One day when I've got spare money to spend on the lab, I think I'll hunt down some of the metal clips that are designed like the typical keck clip.
http://cdn2.bigcommerce.com/server900/448dd/products/52/imag...
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Lambda-Eyde
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| Quote: Originally posted by Sublimatus |
I've never been able to get them on the joint. The wire is very stiff. Perhaps they weren't made to the right specification, or my joints are odd.
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They are tight as shit. You really have to use a lot of force.
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Sublimatus
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I figure they'd probably fit if I really tried hard, but as a general rule I tend to look for alternatives when the solution comes down to being
forceful. Especially in the lab -- as in the case of frozen joints -- the thought of breaking expensive ground glass apparatus keeps me from acting
bullish and impatient.
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jock88
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You could try heating one of them to a (say) dull red and this will remove some of the springyness?
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Pyro
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it will make them a lot more prone to bending though!
all above information is intellectual property of Pyro. |
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