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Dropping Funnel, Cylindrical, PTFE Stopcock

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Dropping Funnel, Cylindrical, PTFE Stopcock (MEDILAB)

Dropping Funnel, Cylindrical, PTFE Stopcock

Cylindrical with PTFE key stopcock & Polyethylene stopper.

  • Compliance with ISO 4800 Standards
  • Provided with PE Stopper
  • With PTFE key stopcock

Note:

  1. Graduated Dropping funnel can also be offered.
  2. Printing can be done in White, Blue or Amber color enamel.
SKU: 11308 Categories: , ,

Description

Catalogue No. Capacity ml N/S  Bore mm Stopcock
11308/1 50 14/23 2.5 PTFE
11308/2 100 14/23 2.5 PTFE
11308/3 250 29/32 4 PTFE
11308/4 500 29/32 4 PTFE
11308/5 1000 29/32 6 PTFE

The Dropping Funnel, Cylindrical with PTFE Stopcock, is a precision glassware instrument designed for controlled, dropwise addition of reagents during chemical reactions, titrations, and analytical procedures. Its cylindrical geometry ensures consistent flow, while the PTFE stopcock provides superior chemical resistance and smooth handling. This funnel is essential for laboratories and industries that require safe, accurate, and contamination-free reagent dispensing.

Key Features

  • High-precision PTFE stopcock provides exceptional chemical resistance and ultra-smooth operation.
  • Cylindrical body supports a stable flow rate and improved accuracy in reagent addition.
  • Manufactured from premium Borosilicate Glass 3.3 for maximum thermal and chemical durability.
  • ISO 4800 compliant, ensuring compatibility with global laboratory standards.
  • Provided with a polyethene (PE) stopper for secure sealing and sample protection.
  • Optional graduations are available for precise volume monitoring.
  • Colour enamel printing (white/blue/amber) is available for enhanced visibility and customisation.
  • Non-stick PTFE key prevents freeze-ups, reduces maintenance needs, and extends lifespan.

Material Specifications

  • Material: Borosilicate Glass 3.3

Thermal Properties:

  • Very low thermal expansion (≈3.3 × 10⁻⁶ /°C), ideal for heating, cooling, and autoclaving.
  • High thermal shock resistance, suitable for routine temperature variations.

Chemical Resistance:

  • Excellent resistance to acids, solvents, and organic chemicals.
  • A PTFE stopcock ensures inert contact surfaces with virtually all reagents.

  • Mechanical Strength: Durable and robust for handling in busy laboratory environments.

  • Standards Compliance: Conforms to ISO 4800 and aligns with applicable DIN and ASTM laboratory glassware norms.

Technical Specifications

  • Available Capacities: Typically offered in 50 mL, 100 mL, 125 mL, 250 mL, 500 mL, and 1000 mL.
  • Design: Cylindrical body with uniform wall thickness for improved durability.
  • Stopcock: High-precision PTFE key stopcock with excellent sealing properties.

Accuracy / Tolerance:

  • Volumetric accuracy conforming to ISO tolerances.
  • Graduated variants follow standardised calibration accuracy.

  • Calibration (Optional): Available with clear, permanent enamel graduations for precise volume measurement.

Packaging:

  • Individually packed in protective, export-grade, shock-resistant packaging.
  • Bulk packing and OEM packaging options for distributors.

Included Accessories:

  • PTFE stopcock assembly
  • Polyethylene stopper

 Handling & Precautions

Safe Use:

  • Ensure the stopcock is correctly aligned and free of debris before dispensing.
  • Maintain a controlled environment to avoid sudden thermal changes.

Cleaning Instructions:

  • Rinse with suitable laboratory detergents or solvents immediately after use.
  • Avoid abrasive brushes to preserve clarity and structural integrity.

Autoclaving & Heating Limits:

  • Funnel body is fully autoclavable; remove the PE stopper before autoclaving.
  • A PTFE stopcock is autoclavable but should not be overheated beyond recommended limits.

Dos & Don’ts:

  • Do inspect regularly for scratches or chips.
  • Do store vertically to avoid stress on the stem.
  • Don’t expose to direct flame or high-alkaline solutions at elevated temperatures for prolonged periods.

Best Practices:

  • Lubrication is not required due to the PTFE key, reducing maintenance.
  • Keep stopcock components clean and free of residues for long service life.

 Applications

  • Chemical Laboratories: Controlled addition during synthesis, titration, and reagent dosing.
  • Pharmaceutical & Biotech Industries: Widely used in formulation studies, R&D, and quality testing.
  • Academic & Research Institutions: Suitable for teaching labs, advanced chemistry courses, and experimental setups.
  • QC/QA Laboratories: Ensures precision in standardised testing and process validation.
  • Industrial & Analytical Labs: Ideal for processes requiring contamination-free, inert reagent handling.
  • Plays a crucial role in reaction control, extraction workflows, buffer preparation, and timed reagent introduction.

Why Choose MEDILAB

  • 35+ years of expertise in manufacturing precision laboratory glassware.
  • Trusted in 40+ countries, serving global distributors, research labs, and industries.
  • Export-quality manufacturing standards, ensuring reliability and performance.
  • OEM & Private Label services are available for distributors and brand owners.
  • Consistent quality control, with every piece inspected for dimensional accuracy and durability.
  • Robust packaging & dependable global logistics for safe international shipments.

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