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:
0.4mm 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 1/8" OD tubing.