Dropping Funnel, Cylindrical, Rotaflow Stopcock

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The Dropping Funnel, Cylindrical with Rotaflow Stopcock is a precision liquid-handling apparatus designed for controlled addition of reagents during chemical reactions, titrations, and extraction processes. Its cylindrical design ensures consistent flow, while the high-quality borosilicate glass construction provides exceptional chemical and thermal resistance. This funnel is an essential tool for research laboratories, universities, pharmaceutical manufacturers, and industrial QC/QA environments requiring reliability and accuracy in reagent dispensing.

Key Features

• Cylindrical body for uniform reagent flow and enhanced measurement stability.
• High-precision Rotaflow stopcock ensures smooth, leak-free, and controlled dispensing.
• Manufactured from Borosilicate Glass 3.3 for excellent thermal resistance and chemical durability.
• Provided with a PE or polyethene stopper for secure sealing during preparation and handling.
• Compliance with ISO 4800 standards, ensuring global laboratory compatibility.
• Non-stick PTFE keys (if applicable) minimise wear and support long-term use.
• Optional graduations are available for accurate volume monitoring.
• Colour-printed enamel markings are available in white, blue, or amber for enhanced visibility.

 Material Specifications

• Material: Borosilicate Glass 3.3
• Thermal Properties: Low thermal expansion coefficient (~3.3 × 10⁻⁶ /°C)Ideal for heating, cooling, and autoclaving operations
• Chemical Resistance: High resistance to acids, solvents, and organic reagents. Suitable for long-term use with aggressive chemicals
• Mechanical Strength: Durable structure designed to withstand regular lab handling

 Technical Specifications

• Available Capacities: Common sizes include 50 mL, 100 mL, 125 mL, 250 mL, 500 mL, and 1000 mL.
• Dimensions: Cylindrical body with tapered outlet. Standard joint sizes and stem lengths suitable for universal lab setups
• Accuracy / Tolerance: Volumetric accuracy as per ISO standards. Optional graduated markings for precise volume control
• Calibration: Graduation accuracy compliant with ISO 4800 (if graduation is selected)
• Stopcock: Rotaflow type, PTFE key or glass key option, depending on model
• Included Accessories: Polyethylene stopper, Rotaflow stopcock assembly

 Handling & Precautions

• Safe Use: Ensure the stopcock is properly lubricated (if a glass key) before use. Avoid sudden temperature changes to protect glass integrity.
• Cleaning Instructions: Rinse immediately after use with mild detergents or appropriate solvents. Use soft brushes; avoid abrasive cleaners.
• Autoclaving: Safe for autoclaving at standard temperatures for borosilicate glass. Remove the PE stopper before autoclaving.
• Do’s & Don’ts: Do check stopcock alignment before dispensing. Do handle the long stem with care to avoid breakage. Don’t use with strong alkali solutions at high temperatures for prolonged periods.
• Best Practices: Store vertically to prevent stopcock stress. Inspect regularly for chips or cracks for maximum safety.

Applications

• Chemical Laboratories: Controlled addition during synthesis, titrations, and reagent dosing.
• Pharmaceutical Industries: Required in formulation, R&D, and quality control testing.
• Biotechnology & Life Sciences: Suitable for buffer preparation, extraction, and controlled reagent mixing.
• Academic & Research Institutions: Common in teaching labs, practical chemistry setups, and student experiments.
• Industrial QC/QA Labs: Critical for standardised, repeatable reagent handling procedures.

• Supports workflows where precision dosing, safe reagent handling, and excellent chemical resistance are essential.