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 dif cult 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 Type
Graphite
Graphite Vespel®
SilTite™ Metal
ClickTek Ferrule
• Speci cally developed to overcome the problems associated with the use of 100% graphite and composite ferrules. • Strong seal on capillary columns. • Leak free - The ferrule and nut expand and contract at the same rate eliminating any chance of leaks with temperature cycling. • Nut does not need re- tightening after initial temperature cycles.
• A composite of graphite and Vespel®. • Mechanically robust. • Hard material, long lifetime. • Forms a strong grip with capillary column. • Cannot be reused with another capillary column. • Requires re-tightening.
• Easy to use • Leak free
• Easy to use. • Forms a stable seal. • Soft material. • Porous to oxygen. • Can be reused. • Forms a soft grip with capillary column. • Low emissions.
• Specially designed to use with ClickTek Connector on Nexis GC-2030 • Cannot be reused with another capillary column • Not suitable for stainless steel column
Features
• Column to injector connection.
• Column to injector connection
MS interfaces, although even with a good seal will leak air compared to SilTite™ ferrules.
Ideal for MS interfaces and advanced flow technology due to leak-free
Suitable Uses
• Non-mass spectrometer detectors (FID, TCD, FTD, FPD, ECD, BID). Connecting columns to mass spectrometers, as porous to oxygen.
• Non-mass spectrometer detectors (FID, TCD, FTD, FPD, ECD, BID).
High temperature applications.
Not Suitable For
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If not re-tightened after installation and temperature cycles of the GC, air may enter the column or detector decreasing sensitivity of the analysis and possibly degrading the column as well as components of the system.
Over-tightening of the seal can introduce leaks into the system. Follow the recommended installation instructions to avoid this problem.
• Can leave residue inside your column. • Can extrude into the injector or detector if it is over-tightened.
Risks
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Operating Temperature
No temperature limit in GC use.
Upper limit of 450 °C
Upper limit of 325 °C
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Pg C-70
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