These class A PYREX® volumetric flasks have machine-blown bodies to which are sealed heavy-beaded, heavy-tubing necks, tooled for PTFE color-coded keyhole stoppers

• Strength increased through machine-blown bodies
• Sharp graduation line and permanent and large white block letters make the inscription easy to read

The graduation line is sharp and permanent. Large white block letters make the inscription easy to read. These 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.