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Ferrule Selection Guide

Material	Uses	Advantages
100% Graphite	FID, NPD	Easy-to-use stable seal High temperature limit Easily removed Reusable	Not for MS or oxygen-sensitive detectors Soft, easily deformed or destroyed Possible system contamination
15% Graphite/85% Vespel	MS and oxygen-sensitive detectors	Long lifetime High temperature limit MS compatible	Cannot be re-used Must be re-tightened after initial temperature cycle
SilTite Metal	MS and oxygen-sensitive detectors	Long lifetime High temperature limit MS compatible	Cannot be re-used