51
Order online at www.agilent.com/chem/store
Inlets
Ferrule Selection Recommendations
Ferrule/ Seal Type Upper Temp.
Limit
Usages Advantages Limitations
Graphite (100%) 450°C
• General purpose for
capillary columns.
• Suitable for FID and NPD.
• Recommended for high
temperature and cool
on-column applications.
• Easy to use stable seal.
• Higher temperature limit.
• Can be removed easily.
• Not for MS or oxygen
sensitive detectors.
• Soft, easily deformed
or destroyed.
• Possible system contamination.
Vespel/Graphite (85%/15%) 350°C
• General purpose for
capillary columns.
• Recommended for MS and
oxygen sensitive detectors.
• Most reliable leak-free
connection.
• Mechanically robust.
• Long lifetime.
• Not reusable.
• Flows at elevated temperature.
• Must retighten frequently.
Vespel (100%) 280°C
• Isothermal operation.
• Can be reused or
removed easily.
• Excellent sealing material
when making metal or glass
connections.
• Mechanically robust.
• Long lifetime.
• Can be reused or
removed easily.
• Leaks after temperature cycle.
• Flows at elevated temperature.
• Must retighten frequently.
SilTite (100% metal) N/A
• Use with Capillary Flow
Technology nut kits
• Provide leak-tight seals with
Ultimate Union, Deans Switch
and Effluent Splitter
• Not reusable.
Tips & Tools
When using V
espel/Graphite ferrules, tighten the column nut 1/4 turn after
the first temperature program runs. Even preconditioned ferrules can
exhibit some shrinkage after a temperature programmed run.
To Next Page
Loading...
