The 2ml snap HPLC vial is made of type 1 borosilicate glass. Compared to 9mm screw vials, this 2ml snap hplc vial opening is a wider opening. Therefore, the 2ml snap top HPLC vial is easy to fill and increases the target area of the autosampler needle. This means that 2ml snap-top HPLC vials can protect needles.