Round Bottom Flask – 250ml, Joint Size 14/23 (Borosilicate Glass)

This 250ml Round Bottom Flask is manufactured from premium 3.3 borosilicate glass, delivering excellent strength, durability, and performance for educational and laboratory use. Designed with a standard ground glass joint (14/23), it allows secure, leak‑free connections to condensers, adapters, and other standard laboratory apparatus.

The rounded base ensures even heat distribution, making this flask particularly suitable for heating, boiling, reflux, and distillation experiments. Borosilicate glass is globally recognised for its high resistance to chemicals and thermal shock, enabling the flask to withstand repeated heating and cooling cycles without cracking or deforming.

With its practical 250ml capacity, this round bottom flask is ideal for both teacher demonstrations and student‑led experiments where controlled reactions and safe heating are required.

Key Features

• Round bottom laboratory flask
• 250ml capacity
• Manufactured from 3.3 borosilicate glass
• Ground glass joint size 14/23
• Excellent chemical resistance
• High thermal shock resistance
• Even heat distribution for efficient heating
• Compatible with standard laboratory joints and fittings
• Ideal for school and laboratory environments

Ideal for School Science Lessons

This 250ml round bottom flask is ideal for use in GCSE and A‑Level chemistry lessons, helping students develop confidence in setting up and using professional laboratory equipment. The smaller joint size is suitable for compact experimental setups and controlled reactions.

• Heating and boiling liquids safely
• Carrying out reflux reactions
• Supporting simple distillation experiments
• Demonstrating correct use of ground glass joints
• Teaching safe handling of heated laboratory glassware

Reliable, heat‑resistant, and classroom‑ready, this 250ml Round Bottom Flask with a 14/23 joint is an essential piece of equipment for safe, accurate, and engaging practical science teaching.