Class B volumetric flasks without stoppers are made from borosilicate 3.3 glass and feature a graduation mark, blue enamel markings, and beaded rims.

• Made of high quality, heavy duty, borosilicate 3.3 glass for excellent durability and chemical resistance
• Class B tolerances conform with DIN ISO 1042 standards for accuracy
• Easy-to-read blue enamel graduations and specifications for contrast against clear liquids
• Fire-polished beaded rims are chip and crack resistant

Calibrated to contain.

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