11mm Crimp Top HPLC Vial for THERMO FISHER--Aijiren Vials for. The 2ml HPLC PP Vial and Cap provided by Aijiren is usually 9mm in diameter, because the 9mm HPLC Vial can match most HPLC Autosamplers on the market. The specification of the 2ml HPLC PP vial is 12x32mm, the opening is increased by 40%, and the standard capacity is 1.5ml.