Selecting an Ampule on Amazon.com
An ampule, also known as an ampoule or ampul, is a small glass or plastic vessel for storing and preserving liquids such as chemical solutions and pharmaceutical products. It has a long, slim body and stem with a narrowed section between the body and stem. Capacity is commonly measured in milliliters (mL), with 1 to 20mL being the most common volumes.
Some ampules have a funnel-shaped mouth to aid filling and to accept a stopper for sealing. To extend shelf life and preserve sample purity by protecting against air and contaminants, an ampule can be hermetically sealed by heating the stem over a direct flame and using the pull or tip sealing methods. Long-stem types may be selected to accommodate sealing of heat-sensitive contents. Many ampules have a scored marking, usually at the narrowed section, so that sealed, filled vessels will break cleanly when opened to eliminate the need for filing. Pre-scoring is often identified by a colored band. An ampule snapper or breaker is a tool that may be used for safe, efficient opening of ampules.
An ampule is most often clear to enable viewing contents. For light-sensitive samples, amber-colored glass provides ultraviolet (UV) resistance. Borosilicate glass, which provides durability, is the most common material for an ampule. Certain ampules are manufactured to meet ASTM requirements for glasses in laboratory apparatus. ASTM E438 establishes specifications for Type I, Class A low-expansion borosilicate glass; Type I, Class B alumino-borosilicate glass; and Type II soda-lime glass.
Ampules, or ampoules, are commonly used by chemists, educators, and researchers in the health, chemistry, biology, and life sciences fields, among others. Some are designed for specific uses, such as a cryogenic ampule for preserving biological materials with liquid nitrogen and a lyophilization ampule for freeze-drying. They are often manufactured to meet specific health, safety, and environmental standards.