PYREX® Class A Volumetric Flask with PE [ST] Stopper, Corning 5642

These Corning Class A PYREX® volumetric flasks have machine-blown bodies to which are sealed heavy-beaded, heavy-tubing necks, tooled for standard taper polyethylene stoppers. The linear high density polyethylene stoppers are made with a closed bottom to conform to standard taper stopper dimensions. The graduation line is sharp and permanent and 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.