Ferrules For Capillary Columns; Graphite And Graphitized-Vespel Ferrules; Vespel Ferrules - Agilent Technologies 6890 Series Operating Manual

Part 1. Capillary columns

Ferrules for capillary columns

Table 12 lists some of the ferrules used with capillary columns and inlet and
detector liners/adapters. See the Agilent catalog for consumables and supplies
for a more complete listing.

Graphite and graphitized-Vespel ferrules

Place some ferrules in a petri dish in the GC oven at 250 to 300°C for 30 minutes
to remove compounds absorbed by the graphite. Leave a dish of assorted
ferrules in the oven to ensure a clean supply.
The ferrule should slide onto the column but not fall off from its own weight. If
it fits properly, 1/4 turn from finger tight will make a good seal. If it is loose, the
column nut must compress the ferrule around the column. This is not a problem
with soft graphite ferrules, but hard ferrules may require so much force that the
inlet fitting may, the nut, or the ferrule may be damaged. With hard ferrules, it
is best to start with an undersize hole and drill it to fit the column.

Vespel ferrules

These ferrules can be more leak-tight than graphite but have a lower temperature
limit. Retighten after a few oven temperature cycles.
Table 12 Hardware Used with Capillary Columns
Item*
1/4-inch graphitized Vespel ferrule, pkg of 10
1.0-mm graphite ferrule, pkg of 10
0.5-mm graphite ferrule, pkg of 10
Column nut
Column cutter
* Ferrule and O-ring ids
Ferrules for capillary columns
Typical use
Inlet/detector liner/adapters
Capillary columns
Capillary columns
Connect column to inlet or detector
Cutting capillary columns
Columns and Traps
Part no.
5080-8774
5080-8773
5080-8853
5181-8831
5181-8836
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