SilTite™: Metal Ferrules provide a continuous leak-free connection and are perfect for connecting your column to a GC/MS. The metal SilTite ferrule and nut are manufactured from the same material and will therefore not expand and contract at different coefficient rates. The base of the SilTite ferrule forms a perfect seal with the MS interface, covering the whole transfer interface.
Graphite/vespel ferrules (15% graphite/85% polyimide) are
recommended for use with GC/MS systems. Best choice for glass
columns and polyimide-coated, fusedsilica capillary columns. Can
usually be removed easily from column. Temperature limit is 350
This is the ferrule of choice for high-temperature applications. Of the three ferrule types available graphite is the softest, making it less damaging to capillary columns when over tightened. Graphite seals easily and does not stick to glass columns. Recommended for use with capillary columns. Temperature limit is 450 °C.
Graphite/Vespel ferrules (15% graphite / 85% vespel) are recommended for use with GCMS systems. Best choice for glass columns and polyimide-coated, fused silica capillary columns. Can easily be removed from the column. Temperature limit is 350 °C.