ASTM Class A volumetric flasks are made from borosilicate 3.3 glass and feature a graduation mark, polypropylene stopper, and blue enamel markings.

• Made of high quality, heavy duty, borosilicate 3.3 glass for excellent durability and chemical resistance
• Class A tolerances conform with ASTM E288 standards for accuracy
• Fitted with a polypropylene flat-top stopper
• Easy-to-read blue enamel graduations and specifications for contrast against clear liquids

Calibrated to contain.

Eisco Labs borosilicate glass has the following heat tolerances:
- Strain Point 515 °C
- Annealing Point 565 °C
- Softening Point 820 °C