Our 9mm HPLC Vials and Closures are our recommended screw thread vials. These vials are autosampler compatible and offer a 40% larger opening than 8-425 thread vials, simplifying pipetting and other routine functions. Product Name: Vial Material: Borosilicate Glass/Glass Type 1. Septa: Non-slit, Pre-Slit, PTFE/Silicone.