Glass HPLC vials, HPLC caps and closures, and HPLC inserts in standard 12x32mm, 15x45mm formats, as well as larger head space vials and caps. National Scientific Vials Superior quality N-51A clear borosilicate glass 5mL sample vial is designed for 33 expansion borosilicate clear glass Type 1, Class A or 51A amber glass