UsingFerruleswithSRI GCs
Gas-tight seals on all tubingand
connections areessential for good
gas chromatography. Hard and
soft graphite, stainless steel,
brass, vespel, and teflon ferrules
ofmany types and sizes are used
to secure different types and di-
ameters of tubing to all the con-
nections on theGC.
Ingeneral, ferrules will bedriven
into the connectionby the tighten-
ingof a nut. Ferrules are essential
because they seal connections not
through the threads of the nut, but
bypressing the ferrule up against
themouth of a connection.
To complete the connection, some
ferrules use two separate parts, a
front and back ferrule, while others
use only one.At right are exam-
ples of ferrules that use both a
front and back part:
1)
Swagelok
1/4” brass ferrule,
2)
Hoke1/8”
brass ferrule,
3)
Swagelok 1/8”
stainless steel ferrule,
4)
Swagelok
1/16” stainless steel ferrule.
Page 1
Swagelok 1/8 front and
back ferruleson
1/8”copper tubing
1
2
3
4
