An ampule, or ampoule, is a small single-dose vial that has a sealed neck. Most ampules are glass but there are ampules made out of plastic. The seal on an ampule is melted onto the tip of the glass container. This creates an airtight barrier that prevents air, water, humidity, and other contaminants from contaminating the liquid or solid inside the ampule. Because of it’s strong seal, to open an ampule, you must break the seals. You cannot re-use ampules. If the seal is broken, return or throw out the ampule.
You will need a filter need when withdrawing liquids or compounds from ampules. This prevents glass from entering the needle. Break the top of the ampule to draw out the liquid before inserting the needle.