ASTM Class B Volumetric flasks are made from borosilicate 3.3 glass and feature a graduation mark, solid glass penny head stopper, and blue or white enamel markings.

• Made of high quality, heavy duty, borosilicate 3.3 glass for excellent durability and chemical resistance
• Class B tolerances conform with ASTM E288 standards for accuracy
• Fitted with a solid glass penny head 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