Chemglass Addition Funnel 25 ml 14/20 Joint PTFE Stopcock with 14/20 Stopper

Equip your microscale laboratory setup with the Chemglass CG-1702-12 Addition Funnel. With a 25 mL capacity, this dropping funnel is an essential tool for the safe, controlled, drop-by-drop addition of liquid reagents into complex, active reaction assemblies.

This funnel comes fully equipped with a premium PTFE (Teflon) stopcock, offering smooth, grease-free flow control that prevents sample contamination while withstanding harsh organic solvents. Complete with a matching 14/20 standard taper glass stopper, it ensures an airtight seal at the top, making it ideal for working with volatile liquids or protecting air-sensitive chemistry.

Key Features & Benefits

• Grease-Free PTFE Stopcock: The highly inert Teflon stopcock plug will not freeze and requires no vacuum grease, ensuring absolute purity of your reagents and providing fine control over the drop rate.
• Microscale Precision: Features a 14/20 standard taper lower inner joint and upper outer joint, seamlessly integrating with standard 50mL and 100mL microscale reaction setups.
• Complete Assembly: Arrives ready to use out of the box, complete with a perfectly fitted 14/20 ground glass stopper to prevent solvent evaporation.
• Premium Borosilicate Glass: Crafted from high-quality, low-expansion borosilicate glass for maximum resistance to chemical corrosion and thermal shock.

Technical Specifications