Dropping Funnels Cylindrical Graduated With Glass Stopcock

Dropping Funnels Cylindrical Graduated with Glass Stopcocks are highly precise laboratory glassware instruments designed for the metered, dropwise introduction of liquid reagents into reaction systems. Fabricated from premium borosilicate glass, their streamlined cylindrical body ensures a steady hydrostatic head, allowing for reliable flow rate control and constant drop regulation over prolonged chemical operations.

This configuration features a precision-ground interchangeable glass stopcock plug. Each glass plug is meticulously ground and polished to match its corresponding barrel, ensuring a smooth rotation and a tight, leak-proof seal when properly lubricated. The addition of highly permanent, fired-on graduation lines allows laboratory technicians to monitor exact volumetric delivery in real time.

Key Features

• Manufactured from high-purity borosilicate 3.3 glass for superior chemical inertness and resistance to thermal shock
  
• Space-saving cylindrical design optimized for compact multi-neck flasks and dense laboratory lattice setups
  
• Precision-ground glass stopcock assembly providing traditional, highly reliable fluid isolation and flow metering
  
• High-contrast, permanent graduation markings using fired-on enamel for rapid and highly accurate volume monitoring
  
• Interchangeable standard ground glass socket and cone joints to facilitate a gas-tight, vacuum-capable seal within closed systems
• International Standards

Our graduated cylindrical 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 a broad range of capacities (e.g., 50ml, 100ml, 250ml, 500ml, 1000ml) with standard international joint configurations (such as 14/23, 19/26, 24/29, 29/32). Custom dimensions, alternative drip tips, or integrated pressure-equalizing arms can be custom manufactured per bulk commercial requests.

Applications

Extensively utilized in synthetic organic chemistry, pharmaceutical research laboratories, academic teaching facilities, industrial pilot plants, and specialized chemical extractions requiring continuous, highly regulated reagent addition under strict ambient or reflux environments.

Why Choose Our Products

• Export-grade glassware featuring optimal optical clarity and structural stress relief via thorough computer-controlled annealing
  
• Meticulously matched glass stopcock plugs ensuring tight seals and excellent performance under vacuum conditions
  
• Permanent graduation scales that remain highly legible and sharp even after repeated autoclaving or aggressive acid wash cycles
  
• Trusted OEM manufacturing partner for global laboratory equipment catalog vendors, procurement agencies, and wholesale scientific suppliers