aijiren Tech™ 9mm Clear Glass Screw Thread Vials Available on GSA/VA or polypropylene and are compatible with 9 mm HPLC and GC autosampler vials. 2/10/20/40 mL Screw Thread Top Sample Vials - Hawach. The material of the vials is low extractable Borosilicate glass. Classified by vials volume, there are 2mL small sample vials. We also supply DN9 mm, DN8 mm top The pros and cons of crimp vs screw top vials - Chromatography . If the threading tool used during manufacturing of the vial has