LCMS Certified Amber Glass 12 x 32 mm Screw Neck Vial, with Cap and Preslit PTFE/Silicone Septum, 2 mL Volume, 100/pk. Chromatographers know that high-quality vials are an essential piece of lab equipment when it comes to getting reliable analytical results in the laboratory. In order to ensure both quality and cleanliness, a strict testing protocol is used to confirm the vials, cap, and septa have been properly manufactured, handled, and packaged.