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Liquid Handling
The two-neck round bottom flask features a classic spherical body with a narrow neck design. It is commonly used in chemical laboratories for reactions requiring heating, reflux, or long-term processing.
Product Details
The two-neck round bottom flask features a classic spherical body with a narrow neck design. It is commonly used in chemical laboratories for reactions requiring heating, reflux, or long-term processing. The narrow neck helps minimize liquid evaporation and splashing, and can be sealed with a rubber stopper or connected to other glass apparatus for experimental setups.
This flask is widely used in heating and reflux reactions. Its structure allows better control of vapor loss and improves experimental safety. Due to the narrow opening, stirring with a glass rod is not recommended; instead, gentle swirling by hand or the use of a magnetic stirrer is preferred. When heating under reflux conditions, a magnetic stirring bar can be placed inside the flask for uniform mixing.

Features:
Standard Two-Neck Design: Suitable for connecting additional laboratory glassware for complex experimental systems.
Ground Glass Joints with Size Marking: Precise joint sizes for easy matching and convenient operation.
Clear and Durable Markings: Labels are clearly printed and resistant to wear, ensuring long-term readability.
Smooth Glass Surface: High-quality finish for easy cleaning and reduced contamination risk.
Round Bottom Structure: Ensures uniform heat distribution and stable reaction performance during heating.
Designed for Reflux Applications: Ideal for long-term heating, chemical synthesis, and laboratory reaction processes.
Order#
Capacity | Main Neck (Ground Joint) | Side Neck (Ground Joint) |
25mL | 14mm | 14mm |
25mL | 19mm | 19mm |
25mL | 24mm | 24mm |
50mL | 19mm | 14mm |
50mL | 19mm | 19mm |
50mL | 19mm | 24mm |
50mL | 24mm | 24mm |
100mL | 19mm | 19mm |
100mL | 24mm | 19mm |
100mL | 24mm | 24mm |
100mL | 24mm | 29mm |
150mL | 19mm | 19mm |
150mL | 24mm | 24mm |
250mL | 19mm | 19mm |
250mL | 24mm | 19mm |
250mL | 24mm | 24mm |
500mL | 24mm | 24mm |
500mL | 29mm | 24mm |
1000mL | 24mm | 24mm |
2000mL | 24mm | 24mm |
3000mL | 24mm | 24mm |
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