Pack of two filter flasks with heavy walls and integral side arm made of borosilicate glass.

• Withstands high temperatures and thermal shocks
• Features tubulated integral side arm adaptable to ³/₈" internal diameter tubing
• Heavy wall design for safe use under vacuum pressure
• Optimized mouth and neck ensures secure fit with stopper when under pressure (stopper not included)

Pack of two filtering flasks with superior chemical durability and heat tolerance. The tubulated integral side arm, heavy walls, and enforced mouth and neck are all designed to safely withstand vacuum pressurization. Made of high quality, heavy duty 3.3 borosilicate glass with the following heat tolerances:
- Strain Point 515 °C
- Annealing Point 565 °C
- Softening Point 820 °C