i am looking for a good coupler/connector to connect 2 GC capillaries together, at first i thought to buy union from VWR/Valco, based from my experiences with capillary LC, then i was told by the GC column vendor that those type of connector has too big void volume for GC, so they send me a few pieces of tubing from their own supply, which is not available from the market. it works. the only problem is now the retention time increase 4 times, as supposed 2 times because of the doubled length, so i think the leaking from the tubing part may be the problem, the tubing is kind of teflon material with the right size id to fit the capillary, the best i can do is just use my fingers to push the capillary into it as far as not too hard to break it inside the tubing(this happened first time when i tried), so there is no way i can guarantee it's not leaking.
so please anyone know a better connector for air-tight connection for capillary GC?
By Anonymous on Friday, November 8, 2002 - 09:11 am:
There are various glass press fit and ferrule connectors availalbe from all the major column supply companies. I am surprised that any type of polymeric tubing would work at all if you are doing temperature programming.
By Anonymous on Friday, November 8, 2002 - 09:18 am:
i am only doing isothermal. can you tell me the name of which company has the right connector?
By Anonymous on Friday, November 8, 2002 - 10:16 am:
metal compression housing butt connector $38.50 ea
p270 Supelco Catalog 2003/4
Catalog number 23796 (for 0.25mmID columns)
choose your ferrule from table
for other column IDs
Glasseal connector pk of 12 $58/pk
Other companies have similar offerings. All can do an excellent job. Take your pick
By Aviv on Thursday, November 14, 2002 - 09:27 am:
Perhaps all is OK.
If you couple two columns the flow rate is halved and thus for twice the length the isothermal elution time should be 4 times longer
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