Vespel®/Graphite ferrules are made from 40% graphite and 60% high-temperature DuPont polyimide. The upper temperature limit is 400° C. The one-piece design does not require back ferrules. Vespel/Graphite ferrules can be reused; they do not sieze onto the column. They are recommended for GC/MS interface applications.

Please note for all ferrules:
0.3mm ID ferrules fit 0.18mm ID and narrower capillary columns
0.4mm ID ferrules fit 0.25mm ID capillary columns
0.5mm ID ferrules fit 0.32mm ID capillary columns
0.8mm ID ferrules fit 0.53mm ID capillary columns

"Straight" ferrules are used for 1/16" OD tubing.