Our single-use crushable glass ampoule blanks are made from 6 to 7 mm outside diameter onion skin glass tubing. One end is closed by flame sealing, and the finished ampoule can be of any length. Typical lengths range from 50 to 100 mm. The ampoule blank can be filled then either heat seal or close the open end. Filled Tamper Resistant Glass Ampoules can be inserted in a thin cardboard sleeve for protection. Find more information here.