Shell Vials. Pharmaceutical, biotech, environmental applications. Routine HPLC, chromatography, dry storage, auto-sampling, dilution and titration applications requiring microliter to milliliter volumes. 51 expansion clear and amber borosilicate glass or polypropylene, vials are configured with and without caps. Available in flat bottom or conical base and plug style solid stopper or starburst low density PE slit caps.