Page 220 - Shimadu Consumables Catalog

Ferrules

Ferrules are available in a variety of different materials, shapes and sizes depending on their use, the instrument and the size of the
capillary column being used. Probably the most important but difficult aspect of choosing a ferrule is the selection of the material
type. The table below will help you choose the appropriate ferrule material for your application.

When choosing ferrules ensure you consider the following:
1) The material that best suits your application.
2) The connection type you want.

The following selection table will assist with your decision.
Ferrule Material Graphite Graphite Vespel® SilTite™ Metal ClickTek Ferrule
Type

• Specifically developed to
overcome the problems
associated with the use
• A composite of graphite
• Easy to use. and Vespel®. of 100% graphite and • Easy to use
• Leak free
composite ferrules.
• Forms a stable seal. • Mechanically robust. • Strong seal on capillary • Specially designed to use
• Soft material. • Hard material, long columns. with ClickTek Connector on
• Porous to oxygen. lifetime.
Features • Leak free - The ferrule and Nexis GC-2030
• Can be reused. • Forms a strong grip with nut expand and contract at • Cannot be reused with
• Forms a soft grip with capillary column. the same rate eliminating another capillary column
capillary column. • Cannot be reused with
• Low emissions. another capillary column. any chance of leaks with • Not suitable for stainless
temperature cycling.
steel column
• Requires re-tightening.
• Nut does not need re-
tightening after initial
temperature cycles.
• Column to injector MS interfaces, although even • Column to injector
connection. Ideal for MS interfaces and connection
Suitable Uses • Non-mass spectrometer with a good seal will leak advanced flow technology • Non-mass spectrometer
air compared to SilTite™
detectors (FID, TCD, FTD, ferrules. due to leak-free detectors (FID, TCD, FTD,
FPD, ECD, BID). FPD, ECD, BID).
Connecting columns to mass
Not Suitable For spectrometers, as porous to High temperature − −
applications.
oxygen.
If not re-tightened after
installation and temperature
• Can leave residue inside cycles of the GC, air may Over-tightening of the
seal can introduce leaks
your column. enter the column or detector
Risks • Can extrude into the decreasing sensitivity of into the system. Follow the −
recommended installation
injector or detector if it is the analysis and possibly instructions to avoid this
over-tightened. degrading the column as problem.
well as components of the
system.
Operating No temperature limit in GC
Temperature Upper limit of 450 °C Upper limit of 325 °C use. −

Pg C-70