Dropping Funnel Graduated With Ptfe Stopcock

Dropping Funnels Graduated with PTFE Stopcocks are high-precision laboratory glassware instruments designed for the metered, dropwise introduction of liquid reagents into reaction mixtures. Fabricated from premium borosilicate glass, these funnels provide exceptional control over liquid delivery, which is vital for maintaining stoichiometrically balanced or highly exothermic reactions.

The inclusion of a high-performance PTFE (Polytetrafluoroethylene) stopcock ensures smooth, non-stick operation without requiring joint lubrication. This grease-free functionality eliminates chemical contamination of pure solvents, prevents the plug from freezing or binding during contact with caustic solutions, and offers outstanding resistance to aggressive acids, bases, and organic compounds.

Key Features

• Manufactured from premium borosilicate 3.3 glass for superior chemical inertness and extreme resistance to thermal shock
  
• Fitted with a precision-machined PTFE stopcock plug for smooth, leak-proof, and grease-free liquid control
  
• High-contrast, permanent graduation markings using fired-on enamel for fast and highly accurate volumetric observation
  
• Interchangeable standard ground glass socket and cone joints to facilitate an airtight fit within multi-neck flasks and distillation setups
  
• Heavy-wall glass configuration providing enhanced mechanical strength and resistance to physical impacts on the lab bench
• International Standards

Our graduated dropping funnels are engineered and manufactured in strict compliance with globally accepted dimensional and quality parameters, ensuring seamless compatibility across international markets:

• ISO 4800 – Laboratory Glassware – Separating Funnels and Dropping Funnels
  
• ISO 383 – Laboratory Glassware – Interchangeable Conical Ground Joints
  
• ASTM E438 – Standard Specification for Glasses in Laboratory Apparatus Manufacturing
• Available in multiple capacities (e.g., 50ml, 100ml, 250ml, 500ml, 1000ml) with various standard joint sizes (such as 14/23, 19/26, 24/29, 29/32). Custom configurations, alternative drip tip configurations, and pressure-equalizing arms can be engineered per bulk commercial requests.

Applications

Widely utilized across fine chemical synthesis, pharmaceutical R&D laboratories, academic organic chemistry research, pilot plant operations, and any analytical setup requiring highly regulated reagent addition under precise ambient or reflux conditions.

Why Choose Our Products

• Export-grade glassware with high optical clarity and zero structural micro-strains
  
• Lubricant-free PTFE plug assembly prevents contamination of high-purity solvents and solutions
  
• Permanent, highly legible graduation scales that remain sharp after repeated autoclaving or acid washing
  
• Trusted supplier by international scientific catalog corporations, tender boards, and B2B medical-laboratory distributors