Cole-Parmer® Class A Borosilicate Glass Volumetric Flasks deliver high-precision liquid measurements for analytical and research labs. Made from chemically resistant borosilicate glass, they withstand thermal shock and repeated sterilization. The high-contrast, permanent markings ensure accuracy, while the glass stopper provides an airtight seal for contamination-free storage. Autoclavable and reusable, these flasks are built for long-term, reliable use.