ASTM Class A volumetric flasks are made from borosilicate 3.3 glass and feature a graduation mark, solid glass pennyhead stopper, and blue or white 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 solid glass pennyhead stopper
• Available with blue or white enamel markings and specifications

Calibrated to contain.

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