The Separating Funnel PEAR SHAPE with PTFE Needle Valve Stopcock engineered by Edulabs represents an advanced solution for ultra-precise liquid-liquid extractions in scientific research and analytical testing. Solvent extraction relies on the differential distribution of compounds between two immiscible solvent layers, and precise separation requires ultra-fine control over the liquid discharge rate.

The defining feature of this model is its integrated PTFE needle valve mechanism. Unlike traditional stopcocks, the needle valve utilizes a threaded PTFE spindle that moves linearly into a glass seat. This design offers micro-adjustable liquid flow rates, enabling technicians to regulate liquid release down to individual droplets or maintain a steady, controlled stream. Because the needle valve relies completely on fluoropolymer-to-glass sealing, it operates completely grease-free, eliminating any risk of sample contamination in sensitive chromatographic or spectroscopic workflows.

The classic pear shape enhances separation dynamics. The wide upper sphere provides maximum contact area when shaking solvents, while the narrow tapered bottom converges liquid phases cleanly above the needle valve orifice. This sharp physical geometry allows operators to isolate dense organic or aqueous fractions with extreme visual accuracy right at the interface layer.

Fabricated entirely from high-grade BORO 3.3 Borosilicate Glass, this funnel provides exceptional thermal stability and chemical inertness against aggressive acids, solvents, and bases. Equipped with a precision-ground neck and an interchangeable Polyethylene (PE) stopper, it ensures leak-free mixing and safety during gas venting. Available in capacities up to 5000 ml, the Edulabs PTFE Needle Valve Separating Funnel is the ideal instrument for high-volume research, pilot plant processing, and analytical chemistry.

Key Features

• Fabricated from premium BORO 3.3 Borosilicate Glass for maximum durability.

• Precision PTFE needle valve provides micro-adjustable flow rate control.

• 100% grease-free valve operation eliminates sample contamination risks.

• Pear-shaped geometry allows rapid phase settling and sharp interface detection.

• Polyethylene (PE) stopper ensures a secure, leak-proof seal during agitation.

• Superior chemical resistance to organic solvents, concentrated acids, and bases.

• Excellent thermal shock stability across wide operating temperature ranges.

• Standardized ground joint neck allows easy stopper replacement.

• Manufactured in compliance with international DIN/ISO quality specifications.

• Offered in extensive volume capacities starting from 125 ml up to 5000 ml.

Technical Specifications

Available Models

Applications

• Fine droplet-controlled liquid-liquid extractions in ultra-trace organic analysis.

• Sample cleanup for highly sensitive GC-MS, LC-MS, and HPLC routines.

• Separation of reactive chemical intermediates sensitive to hydrocarbon grease.

• Pharmaceutical purification and active ingredient isolation in R&D labs.

• Environmental analysis of volatile organic pollutants, phenols, and pesticides.

• Large-scale batch solvent extractions using the 5000 ml high-capacity model.

• Essential oil and botanical extract fractionations.

• Industrial quality control extractions in chemical and polymer industries.

• Acid-base liquid partitioning in synthetic organic chemistry research.

• Advanced university research and teaching laboratories.

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.