Jun 15, 2020 Packed columns are constructed from glass, stainless steel, copper, or aluminum, and typically are 2–6 m in length with internal diameters of 2– HPLC and GC Vials, Caps, Septas and Inserts Guide (Bestsellers . Mar 22, 2020 Crimp Vials squeeze the septum between the rim of the glass vial and the crimped aluminum cap.