100pcs/pk. 2mL Amber Glass 12x32mm Flat Ba very low expansion coefficient autosampler sample vials 12x32mm low metal content HPLC sample vials closures-HPLC 6 ® Shimadzu's Guide to Vial Selection Hold the sample without allowing it to adsorb into the container competitor's MS certified glass vial compared to the Shimadzu Low Adsorption vial.