These 250 mL Class A PYREX® volumetric flasks have machine-blown bodies to which are sealed heavy-beaded, heavy-tubing necks, tooled for No. 16 PTFE color-coded keyhole stoppers. For replacement stoppers see No. 7630. 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.
The strength of the flasks have been significantly increased through machine-blown bodies, which are sealed to heavy-tubing necks. The graduation line is sharp and permanent; large white block letters make the inscription easy to read. Supplied with PTFE color-coded, keyhole stoppers.
For stoppers only, see Cat. No. 7630