Chromatography / GC Autosampler Vials

Chromatography autosampler vials are small but exacting. A GC or HPLC autosampler robot picks up each vial and pierces its septum with a needle, so the vial's dimensions — the standard 12 x 32 mm 2 ml format above all — must be held to tight tolerances for the instrument to seal and sample reliably across a long, unattended run.

Made from Type I borosilicate with very low extractables, they avoid leaching anything that would show up as a contaminant peak at the trace levels these instruments detect. Amber vials protect light-sensitive analytes.

GC, GC-MS, HPLC and LC-MS analysis, autosampler workflows, trace and residue analysis, and pharma, environmental, food, forensic and clinical QC. Low-volume inserts let small samples be analysed in the standard vial format.

A 12 x 32 mm Type I borosilicate vial with a 9 mm screw, 11 mm snap or 11 mm crimp finish, sealed by a cap with a PTFE/silicone septum that the needle pierces. Clear and amber glass are available; dimensional tolerances are tight for autosampler reliability, and the glass is low-extractable for trace work.

Match the cap and septum to the application — PTFE faces the sample for chemical resistance, silicone gives resealing — and avoid over-tightening screw caps, which can distort the septum. Use amber vials for light-sensitive analytes and inserts for small sample volumes. Cleanliness is critical, since any contamination appears in the chromatogram.

Autosampler vials are usually made from Type I borosilicate tubing converted on precision machines that form the body and finish to tight tolerances. Annealed and cleaned to low-extractable standards. Dimensional accuracy and glass purity are the critical checks for instrument compatibility and trace analysis.