Agilent, 5181-3323, Ferrule, 0.4 mm id, 15% graphite/85% Vespel, 0.1 to 0.25 mm column, 10/pk

Agilent graphite/Vespel ferrules seal fused-silica capillary columns at compatible gas chromatography inlet and detector connections. Each ferrule has a 0.4 mm internal bore and a composition of 15% graphite and 85% Vespel. The short-ferrule design is intended for columns with nominal 0.1–0.25 mm internal diameters and is rated for GC oven temperatures up to 350 °C. The composite material combines sealing performance with reduced gas permeability, an important consideration for oxygen-sensitive detectors and GC/MS interfaces. Ferrules must be sized for the column outside diameter and fitting geometry rather than the nominal analytical method alone. Proper installation minimizes leaks, baseline noise and carrier-gas loss while avoiding overtightening that can damage the column. The package contains ten ferrules. These parts are connection seals, not GC inlet septa, column nuts or replacement capillary columns.