GC ferrules

Reliable seal | Precision | Ultra clean

Designed to simplify your GC connections

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Trajan Scientific and Medical manufacture a wide variety of standard and special ferrules
used in gas chromatographs and other instruments. Our wide range of ferrules are madefrom Vespel®, Vespel/graphite, graphite and PTFE. The standard ferrule product line isused to seal tubing and capillaries to standard compression fittings in a variety of sizes.

Reliable seal | Precision | Ultra clean

Graphite GC ferrules
Graphite GC ferrules are made from high purity exfoliatedgraphite. They seal with minimal torque and are reusable if they
are not over tightened. Graphite GC ferrules do not shrink in use
but are very soft and must be packed and handled with care.
Graphite ferrules are commonly used in GC systems on the inlet
and detector ends because they don’t stick to the column, andcan be removed and reinserted easily. They should not be usedwith GC/MS instruments because of permeability to air.
You should always trim a short piece of the column after replacing
the ferrule to be sure that not graphite particles have pluggedthe column.
Upper temperature limit of 450°C.

PTFE GC ferrules
PTFE GC ferrules are made from 100% PTFE. They are soft,completely inert, and have very low friction. PTFE GC ferrules
are hydrophobic and commonly used in liquid applications.
Upper temperature limit of 250°C.

Connections | GC ferrules

Vespel GC ferrules
Vespel GC ferrules are made from 100% high-temperaturepolyimide, a hard polymeric material that tends to seal
permanently to capillary columns whenin use. A firm torque is required to compress and seal.
They are not reusable and tend to shrink throughrepeated heating and cooling cycles.
Vespel GC ferrules are excellent for creating seals on metal or glass and have long
lifetimes. 100% Vespel is essentially non-porous to oxygen so it is ideal for GC/MS
interface use, where air permeation can raise the background signal and contribute tophase degradation. They also work best in connections that are isothermal or insulated
from oven temperature changes.
Upper temperature limit of 350°C.

Vespel/graphite GC ferrules
Vespel/graphite GC ferrules are made from quality
polyimide/graphite blend. They seal with minimal
torque and can be reused and repositioned along capillarycolumns if not over compressed in the fitting. Due to slightshrinking at high temperatures, they must be retightened
after initial temperature cycles to avoid leaks.
Two types of Vespel/graphite are commonly used, one with 40% graphite and one
with 15% graphite. They are ideal for GC/MS interface applications because they are
non-porous to oxygen. The inclusion of graphite increases high-temperature tolerance
and reduces sticking and shrinkage.
Trajan offers both Vespel/graphite blends, a 60/40 mix and an 85/15 mix. The 85/15
maintains a high level of hardness and long lifetime. The 60/40 blend is softer, withimproved wear resistance and lower friction. These ferrules will require less force tocompress and form a seal.
Both blends have an upper temperature limit of 400 C.

Designed to simplify your GC connections

GC ferrules
Designed to simplify your GC connections

BR-0613-G_RevA © Trajan Scientific Americas Inc 10/2022

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