A PLUS Round Bottom Jointed Flask – 250ml, 24/29 Joint (ASTM‑Accredited Borosilicate Glass)

The A PLUS Round Bottom Jointed Flask, 250ml is a reliable and great‑value laboratory essential, manufactured from ASTM‑accredited 3.3 borosilicate glass. Designed for exceptional durability, thermal stability, and chemical resistance, this flask provides long‑lasting performance in both educational and professional settings. Fully equivalent to and compatible with Quickfit‑style jointed components, it integrates seamlessly into standard laboratory apparatus.

Featuring a standard 24/29 ground‑glass joint, this versatile round bottom flask is ideal for heating, reflux, distillation, and a wide range of chemistry experiments. Its round bottom design ensures smooth and even heat distribution, making it suitable for use with heating mantles, water baths, and other controlled‑temperature equipment.

Key Features

• 250ml round bottom flask with 24/29 joint
• Made from ASTM‑accredited 3.3 borosilicate glass
• High chemical and thermal resistance
• Fully compatible with Quickfit‑type jointed glassware
• Suitable for reflux, distillation, heating, and synthesis
• Round bottom design provides even heating and improved reaction control
• Durable and cost‑effective—ideal for schools and laboratories

Ideal for School Science Lessons & Chemistry Practicals

This 250ml jointed flask is perfect for KS4 (GCSE) and A‑Level chemistry lessons, providing a safe and reliable option for heat‑based experiments, organic synthesis, and demonstrations of jointed glassware systems. Its medium capacity makes it particularly useful for practical activities where precision and controlled heating are essential.

• Reflux experiments using condensers attached to the 24/29 joint
• Distillation setups involving gentle or sustained heating
• Organic synthesis and reaction studies requiring even heat distribution
• Evaporation, mixing, and solution preparation
• Teacher demonstrations involving standard jointed apparatus

Strong, dependable, and compatible with common school laboratory equipment, the A PLUS 250ml Round Bottom Flask supports safe, engaging, and hands‑on chemistry learning.