PYREX® Class A Volumetric Flask with PTFE Keyhole Stopper, Corning 5644

Corning® PYREX® Class A volumetric flasks have machine-blown bodies to which are sealed heavy-beaded, heavy-tubing necks, tooled for No. 27 PTFE color-coded keyhole stoppers. The graduation line is sharp and permanent. Large white block letters make the inscription easy to read. These Class A volumetric flasks have been manufactured to Class A tolerances as established by ASTM E-694 for volumetric ware, ASTM E-542 for calibration of volumetric ware, and ASTM E-288 for volumetric flasks. These Corning 5644 series volumetric flasks are the suggested replacement for the Corning 5670 series volumetric flasks.