Columns and Traps
Ferrules and O-rings for glass packed columns
Released: March 2004 6850 Series II GC User Information page 24 of 256
Graphite and graphitized-Vespel ferrules
Place these ferrules in a petri dish and bake in the GC oven at 250 to 300°C for
30 minutes before use to remove organic compounds absorbed by the graphite.
Leave a petri dish of assorted ferrules in the GC oven to ensure a clean supply.
Vespel ferrules
These ferrules can be more leak-tight than graphite, but have a lower
temperature limit. They should be retightened after a few oven temperature
cycles to ensure a good seal. Be sure to use the correct ferrule for the size
column you are using.
Ferrules and O-rings for glass packed columns
Table 10 lists some of the nuts and ferrules used with packed glass columns.
See the Agilent catalog for consumables and supplies for a more complete listing.
Ferrules that are prepared improperly cause leaks and contamination. To avoid
problems, place graphitized Vespel ferrules in a petri dish and bake in the GC
oven at 250 to 300°C for 30 minutes before use to remove organic compounds
absorbed by the graphite. Leave a petri dish of assorted ferrules in the GC oven
to ensure a clean supply.
Table 10. Glass Packed Columns Consumables
Item* Typical use Part no.
1/4-in. graphitized Vespel ferrule, pkg of 10 Inlet/Detector liners,
1/4-in. glass packed columns
5080-8774
Silicone O-ring, 6.0-mm 1/4-in. glass packed columns 0905-0322
* O-ring and ferrules ids
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