- PYREX Volumetric Flask 250 ml made of durable and clear borosilicate glass with plastic Snap Cap. The strength of these flasks has been increased appreciably through machine-blown bodies which are sealed heavy-beaded, heavy-tubing necks, tooled for snap cap fit. The graduation line is sharp and permanent; large white block letters make the inscription easy to read. The 250 mL size is test-tube-shaped.
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