Sample vials come in various sizes, the most common for liquid injection is 12 x 32mm vials. Depending on the sample bottle manufacturer, a 12x32mm sample bottle can also be called a 1.5mL sample bottle, a 1.8mL sample bottle or a 2.0mL sample bottle. flat base 12x32mm HPLC GC vials--HPLC GC Vials Supplier. LC/GC Certified Vials are UV-tested