GammaFunction
Hazard to Self
Posts: 78
Registered: 28-1-2013
Member Is Offline
Mood: No Mood
|
|
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.
|
|
|
cyanureeves
National Hazard
Posts: 744
Registered: 29-8-2010
Location: Mars
Member Is Offline
Mood: No Mood
|
|
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]
|
|
|
Endimion17
International Hazard
Posts: 1468
Registered: 17-7-2011
Location: shores of a solar sea
Member Is Offline
Mood: speeding through time at the rate of 1 second per second
|
|
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  )
|
|
|
GammaFunction
Hazard to Self
Posts: 78
Registered: 28-1-2013
Member Is Offline
Mood: No Mood
|
|
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.
|
|
|
Lambda-Eyde
National Hazard
Posts: 860
Registered: 20-11-2008
Location: Norway
Member Is Offline
Mood: Cleaved
|
|
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.
|
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.
This just in: 95,5 % of the world population lives outside the USA
Please drop by our IRC channel: #sciencemadness @ irc.efnet.org
|
|
|
Dr.Bob
International Hazard
Posts: 2755
Registered: 26-1-2011
Location: USA - NC
Member Is Offline
Mood: Mildly disgruntled scientist
|
|
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.
|
|
|
ElizabethGreene
Hazard to Others
Posts: 141
Registered: 15-10-2012
Member Is Offline
Mood: No Mood
|
|
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.
|
|
|
jock88
National Hazard
Posts: 505
Registered: 13-12-2012
Member Is Offline
Mood: No Mood
|
|
Can you upload a picture of just one?
|
|
|
Lambda-Eyde
National Hazard
Posts: 860
Registered: 20-11-2008
Location: Norway
Member Is Offline
Mood: Cleaved
|
|
Google can help with that: http://sciencesupply.com.au/shop/504-thickbox/keck-clips.jpg
This just in: 95,5 % of the world population lives outside the USA
Please drop by our IRC channel: #sciencemadness @ irc.efnet.org
|
|
|
Sublimatus
Hazard to Others
Posts: 108
Registered: 8-6-2011
Member Is Offline
Mood: No Mood
|
|
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...
|
|
|
Lambda-Eyde
National Hazard
Posts: 860
Registered: 20-11-2008
Location: Norway
Member Is Offline
Mood: Cleaved
|
|
| 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.
|
They are tight as shit. You really have to use a lot of force.
This just in: 95,5 % of the world population lives outside the USA
Please drop by our IRC channel: #sciencemadness @ irc.efnet.org
|
|
|
Sublimatus
Hazard to Others
Posts: 108
Registered: 8-6-2011
Member Is Offline
Mood: No Mood
|
|
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.
|
|
|
jock88
National Hazard
Posts: 505
Registered: 13-12-2012
Member Is Offline
Mood: No Mood
|
|
You could try heating one of them to a (say) dull red and this will remove some of the springyness?
|
|
|
Pyro
International Hazard
Posts: 1305
Registered: 6-4-2012
Location: Gent, Belgium
Member Is Offline
Mood: No Mood
|
|
it will make them a lot more prone to bending though!
all above information is intellectual property of Pyro. |
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
