Dropping Funnel, Cylindrical, Glass Stopcock

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GISCOM Cylindrical Dropping Funnel with Glass Stopcock is a precision-controlled addition funnel designed for accurate reagent delivery during titrations, synthesis, extractions, and sensitive chemical reactions. Its tall, cylindrical body ensures consistent drip rates and clear visibility of reagent levels. Engineered from premium Borosilicate Glass 3.3, it provides exceptional chemical resistance and stability, making it indispensable in research labs, pharmaceutical processes, QC/QA environments, and educational institutions.

Key Features

• Cylindrical Design ensures consistent drop formation and uniform reagent flow.
• High-Precision Glass Stopcock for smooth, accurate, and leak-free dispensing.
• Supplied with a Polyethene (PE) Stopper, lightweight and chemically resistant.
• Manufactured in Compliance with ISO 4800 Standards, suitable for global lab use.
• An optional graduated version is available for volume measurement and analytical workflows.
• Crystal-Clear Transparency for easy visual monitoring of liquid level and purity.
• High Chemical Resistance to acids, alkalis, and organic solvents.
• Durable Construction with thick, even glass walls for long service life.
• Custom Printing Options are available in White, Blue, or Amber enamel for branding or readability.

Material Specifications

• Material: Borosilicate Glass 3.3 (ISO 3585 compliant).
• Thermal Properties: Very low thermal expansion coefficient, Superior thermal shock resistance, Suitable for autoclaving and controlled heating
• Chemical Resistance: Compatible with most laboratory reagents and aggressive chemicals. Smooth, non-porous surface resists staining and contamination
• Mechanical Properties: High mechanical stability and scratch resistance. Maintains clarity and structural integrity over repeated use

Technical Specifications

• Available Capacities: As per the standard size table
• Stopcock Type: Precision-ground Glass Stopcock
• Stopper: Polyethene (PE) stopper included
• Graduation (Optional): Graduated version available with clear, permanent enamel markings
• Tolerance & Accuracy: Manufactured within standard laboratory tolerances for addition funnels

Accessories Included:

• PE stopper
• Glass stopcock (assembled)

Handling & Precautions

• Safe Use: Ensure the stopper and stopcock are securely positioned before dispensing. Use vertical support on retort stands to prevent breakage
• Cleaning Instructions: Rinse immediately after use. Use non-abrasive detergents suitable for glassware. Avoid harsh mechanical scrubbing
• Autoclaving & Temperature Limits: Autoclavable at standard conditions. Remove the PE stopper before autoclaving. Avoid sudden temperature changes to prevent stress fractures
• Dos: Lubricate the stopcock lightly when required. Inspect for chips or cracks before each use. Store upright to protect the stem
• Don’ts: Avoid overtightening the stopcock. Do not expose to direct flame
• Best Practices: Handle with care during assembly and disassembly. Keep stopcock channels clean for smooth operation

Applications

• Chemical Synthesis & Reaction Control
• Titrations and Controlled Reagent Addition
• Organic Chemistry Labs & Solvent Handling
• Pharmaceutical & Biopharma R&D
• Quality Control/Quality Assurance Laboratories
• Biotechnology and Life Science Workflows
• Academic Teaching and Training Laboratories

This funnel is essential wherever precise addition of reagents, dropwise feeding, or controlled reaction kinetics are required.