VIAL DESCRIPTION. QTY. CAT. NO. PRICE. POLYPROPYLENE CAP, PTFE/SILICONE SEPTUM. Clear glass. 100. 27487-U. 1000. 27542. Clear glass w/marking spot. SAMPLE VIALS, 20ML, 28 x 57MM, 33 EXPANSION - Chemglass. SAMPLE VIALS, 20ML, 28 x 57MM, 33 EXPANSION BOROSILICATE GLASS. Packaged in a clear PETG tray complete with a slide or lift off dust cover