PTFE ferrules have an upper temperature limit of 250° C. Ferrules have precision-drilled IDs so there are no mold imperfections. The one-piece design does not require a back ferrule. PTFE is completely inert and does not stick to glass. Ferrules come 10/pk except as noted.

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.