The Separating Funnel PEAR SHAPE with PTFE Key Stopcock from Edulabs is a high-performance laboratory vessel designed for seamless liquid-liquid phase extractions. Liquid-liquid extraction is a core analytical methodology used to separate compounds based on their differential solubility in immiscible liquid phases. This separating funnel is tailored for procedures where sample purity is paramount and grease contamination must be strictly avoided.

The defining technical feature of this model is its Polytetrafluoroethylene (PTFE) key stopcock assembly. Unlike traditional ground-glass stopcocks that require silicon or hydrocarbon grease to prevent seizing and leaking, the PTFE key operates completely grease-free. PTFE provides total chemical inertness, preventing organic solvents from dissolving stopcock grease into the sample distillate. Additionally, the PTFE key resists seizing, binding, or freezing even when exposed to strong alkaline or acidic media.

The pear-shaped geometry optimizes separation efficiency. As two mixed liquids settle inside the vessel, the broad upper section promotes rapid phase separation. As the liquid levels drop toward the narrow bottom, the steep wall slope concentrates the interface layer into a sharp, narrow band. This visual advantage allows lab analysts to precisely stop the liquid flow via the smooth-turning PTFE key exactly as the boundary line reaches the orifice.

Fabricated from high-grade BORO 3.3 Borosilicate Glass, this funnel exhibits superior mechanical strength, low thermal expansion, and near-universal resistance to chemical attack. Standardized interchangeable ground joints fitted with a Polyethylene (PE) stopper guarantee a vapor-tight seal during shaking and inversion. Engineered to strict international standards, the Edulabs PTFE Key Separating Funnel is the ideal solution for clean, contamination-free laboratory extractions.

Key Features

• Constructed from top-tier BORO 3.3 Borosilicate Glass for maximum chemical stability.

• Grease-free PTFE key stopcock prevents sample contamination and eliminates joint seizing.

• Pear-shaped design provides sharp visual demarcation between immiscible liquid layers.

• Fitted with a tight-sealing Polyethylene (PE) stopper for leak-proof mixing.

• Exceptional resistance to strong acids, organic solvents, and caustic compounds.

• Smooth-turning PTFE valve offers precise droplet-by-droplet delivery rate control.

• Built in compliance with DIN/ISO and international glassware standards.

• Uniform wall thickness provides enhanced durability and thermal shock resistance.

• Standardized ground glass socket allows interchangeable stopper compatibility.

• Available in volume capacities ranging from 125 ml up to 2000 ml.

Technical Specifications

Available Models

Applications

• Trace contaminant extraction where grease residue interferes with analytical results.

• Pharmaceutical intermediate isolation and purity testing.

• Extraction of volatile organic compounds (VOCs) and lipids in environmental analysis.

• Acid-base solvent extractions in synthetic organic research labs.

• Food oil and fat constituent determination in food technology testing.

• Preparation of analytical samples for Gas Chromatography (GC) and HPLC.

• Isolation of botanical extracts and natural chemical constituents.

• Separation of aqueous and organic solvent layers in routine wet chemical testing.

• Quality control of agrochemicals, pesticides, and specialized polymers.

• Educational chemistry experiments requiring grease-free liquid partitioning.

Note

Edulabs also offers a comprehensive range of laboratory glassware, laboratory plasticware, laboratory chemicals, laboratory instruments, laboratory equipment, scientific apparatus, educational laboratory equipment, and customized laboratory solutions for educational institutions, research laboratories, pharmaceutical industries, healthcare facilities, biotechnology laboratories, environmental testing laboratories, food and beverage laboratories, and industrial quality control laboratories. Contact Edulabs for bulk orders and OEM requirements.