Overview
The flask with connecting neck funnel is specialized laboratory glassware that integrates a standard reaction flask with a funnel-shaped neck. This design allows for controlled liquid additions during chemical reactions without requiring separate apparatus. Commonly made from borosilicate glass (such as Pyrex or Duran), it withstands thermal stress and chemical corrosion. The integrated design reduces setup complexity in organic synthesis and distillation processes. The funnel neck typically features ground glass joints (often 24/29) for secure connections to condensers or other apparatus. This equipment is particularly valuable in reflux setups where gradual reagent addition is necessary.
Physical and Chemical Properties
These flasks maintain the properties of high-quality borosilicate glass: thermal shock resistance (typically up to 200°C temperature differentials), chemical inertness to most acids and solvents, and transparency for reaction monitoring. The funnel neck's angle (usually 60-75 degrees) optimizes liquid flow while minimizing splash risk. Standard capacities range from 100ml to 2000ml, with wall thickness varying proportionally. The ground glass joints ensure airtight connections, critical for inert atmosphere reactions. Some versions include vacuum jackets or threaded necks for specialized applications.
Main Applications
Primary uses include controlled addition in exothermic reactions, where slow reagent introduction prevents runaway reactions. They're essential in Grignard reactions, esterifications, and multi-step synthesis. The design also facilitates solvent recovery in distillation setups by allowing direct addition to boiling flasks. In teaching laboratories, these flasks simplify demonstration of reflux techniques. Industrial applications include small-scale pharmaceutical synthesis and specialty chemical production where precise addition rates impact yield and purity.
Safety and Storage
Always inspect for chips or cracks before use, especially around the funnel neck where stress concentrates. Use appropriate clamps to support the assembly, as the extended neck creates leverage. Thermal shock prevention requires gradual heating/cooling rates, particularly with viscous solutions that may unevenly transfer heat. Store separately from metal tools to prevent scratching. For long-term storage, disassemble joints and place in padded containers. Chemical residues should be thoroughly cleaned to prevent joint freezing. Hydrofluoric acid and strong alkalis require special handling due to potential glass corrosion.
B2B Procurement Guide
When sourcing in bulk, verify ISO 4797 and ASTM E438 standards compliance for thermal performance. Key specifications include: joint size standardization, glass thickness consistency, and annealing quality. For pharmaceutical applications, request USP Class I or USP Class VI certification documentation. Leading manufacturers include Schott, Corning, and Kimble. MOQ typically starts at 50-100 units for standard sizes. Consider OEM options for custom joint configurations or volume discounts. Shipping requires proper padding—experienced suppliers use partitioned foam inserts to prevent transit damage.
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