Graphite/Vespel Ferrule: 0.4 mm I.D., 0.18 to 0.25 mm column (10/pack)
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.