Academy Filter Flask – 250ml (Borosilicate Glass with Sidearm)

This high‑quality Academy 250ml Filter Flask is manufactured from durable borosilicate glass, providing excellent thermal stability, chemical resistance, and long‑lasting durability for laboratory and educational use. Designed with a heavy‑walled structure and a strong glass sidearm, this flask is ideal for vacuum filtration and other laboratory suction applications.

The sidearm fits tubing with an 8mm internal diameter across all flask sizes, ensuring secure connections during filtration setups. The flask also features a narrow neck and reinforced upper neck designed for safe handling and compatibility with a range of rubber stoppers and cones. Neck diameters include a 29mm narrow neck and a 34mm upper neck for versatile laboratory use.

Suitable stopper and cone options include solid, 1‑hole, and 2‑hole rubber stoppers, as well as a 33/24–39/28mm rubber cone (BEES code 2164) for secure sealing during vacuum operations.

Key Features

Manufactured from durable borosilicate glass
Heavy‑walled construction for vacuum filtration
Glass sidearm suitable for 8mm internal diameter tubing
Superior chemical and heat resistance
Capacity: 250ml
Narrow neck diameter: 29mm
Upper neck diameter: 34mm
Compatible rubber stoppers:

1159 – Solid 31mm
1163 – 1‑Hole 31mm
1494 – 2‑Hole 31mm

Compatible rubber cone:

33/24–39/28mm Rubber Cone (BEES code 2164)

Ideal for School Science Lessons

Perfect for GCSE and A‑Level science, this 250ml filter flask is an essential tool for vacuum filtration and separation techniques. Common uses in the classroom include: