2ml snap vial is widely used in HPLC applications and can be used almost as universal sample vials for autosamplers, including sample vials with automatic operation. The bayonet cap or crimp cap can be used to close the bayonet bottle. The snap cover can be easily pushed in or pulled out by hand. Transparent glass vials-made of USP Type I, Class A, 33 borosilicate expanded glass. Amber glass vials-made of USP Type 1 Class B 51 borosilicate glass.