China 2ml PP Screw Top HPLC Vial Manufacturers, 2ml Polypropylene vials are available in 300ul volumes. Breakage is not an issue with PP vials and they are not reactive with most sample chemistries. 2ml PP Screw Top HPLC Vial With Insert. Ref.No. Packing. Description. C0001195. 100pcs/pk. 0.3mL 9-425 PP Screw Thread Micro-Vial Transparent.12x32mm.