High-density polyethylene stopper won’t break if dropped
Volumetric flasks are constructed of borosilicate glass
These PYREX® Brand 5642 Class A volumetric flasks feature machine-blown bodies and heavy-beaded, heavy-tubing necks to provide excellent durability. Volumetric flasks include a linear high-density polyethylene stopper that conforms to stopper dimensions. The graduation line is sharp and permanent. Large white block letters make the inscriptions easy to read. The 2-mL flask is test tube shaped.