National Scientific Wide Opening Crimp-Top Vials Unassembled Vial Kits Clear Vials Pack. The wide opening provides excellent evaporation flow rates making the vials useful in a wide variety of scientific experiments. The vial necks are heat-treated to ensure a long-lasting glassy finish. Thermo Scientific Wide-Opening Crimp-Top Vials resist evaporation from many pharmaceutical and biotechnology manufacturing processes and are ideal for use in a variety of research clinical and industrial settings. Ordering Information: Vial sets and dispensing caps are individually packaged. National Scientific Wide Opening Crimp-Top Vials VW60871T-1232 Unassembled Vial Kits Clear Vials Pack