Glassco Separating Funnel — Pear Shape (ISO) with PTFE Stopcock
The Glassco pear shape separating funnel is a borosilicate 3.3 glass liquid-liquid extraction funnel manufactured to ISO standards, featuring a PTFE stopcock and PE stopper. The pear shape — also referred to as the ISO or conical separating funnel form — provides a compact profile with a narrow base that concentrates the lower phase at the stopcock outlet, facilitating precise and complete phase drainage during liquid-liquid extraction procedures.
Without graduation markings, the clear borosilicate 3.3 glass body provides an unobstructed view of the two liquid phases during extraction, enabling accurate phase boundary identification before draining. The PTFE stopcock provides excellent chemical resistance to the organic solvents used in liquid-liquid extraction workflows. Available in capacities from 50mL to 2000mL, supplied from Glassco’s European warehouse in the Netherlands for fast delivery across Ireland.
Key Features
Pear Shape (ISO) — Compact and Precise
The pear shape profile concentrates the lower liquid phase toward the narrow base and stopcock outlet, making it easier to drain the lower phase completely and precisely — particularly advantageous in analytical-scale extractions where minimising residual lower phase volume in the funnel after drainage is important for extraction yield and accuracy.
PTFE Stopcock — Chemically Resistant and Maintenance-Free
The PTFE stopcock provides outstanding chemical resistance to the full range of organic solvents used in liquid-liquid extraction — including dichloromethane, chloroform, ethyl acetate, and petroleum ether — with no grease lubrication required. This eliminates the risk of stopcock grease contaminating extracts and removes the ongoing maintenance requirement associated with glass stopcocks.
Without Graduation — Clear Phase Visibility
The absence of graduation markings on the funnel body provides maximum clarity for observation of the phase boundary between organic and aqueous layers during extraction — enabling accurate and confident phase separation before drainage.
PE Stopper Included
Each separating funnel is supplied with a PE stopper for the top opening, providing a secure seal during mixing and inversion steps in the liquid-liquid extraction procedure.
NS Ground Glass Neck
NS ground glass neck joint provides compatibility with standard laboratory stoppers and fittings across all capacity configurations.
Borosilicate 3.3 Glass
Excellent chemical resistance to the full range of extraction solvents and reagents, with the optical clarity required for accurate phase boundary observation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Glassco |
| Type | Separating Funnel — Pear Shape (ISO/Conical) |
| Glass Type | Borosilicate 3.3 |
| Standard Compliance | ISO |
| Stopcock Material | PTFE |
| Stopper | PE stopper — included |
| Graduation | Without graduation |
| Neck Type | NS ground glass |
| Available Capacities | 50mL, 100mL, 250mL, 500mL, 1000mL, 2000mL |
| Supply Origin | Glassco European Warehouse, Netherlands |
Capacity and NS Joint Reference
| Capacity | NS Joint | Bore (mm) | Item Code |
|---|---|---|---|
| 50mL | NS 19/26 | 2.5 | EU152.202.02 |
| 100mL | NS 19/26 | 2.5 | EU152.202.03 |
| 250mL | NS 29/32 | 4.0 | EU152.202.04 |
| 500mL | NS 29/32 | 4.0 | EU152.202.05 |
| 1000mL | NS 29/32 | 6.0 | EU152.202.06 |
| 2000mL | NS 29/32 | 6.0 | EU152.202.07 |
Applications
- Analytical liquid-liquid extraction — precise extraction of analytes from aqueous matrices for chromatographic or spectrophotometric analysis
- Pharmaceutical sample preparation — extraction and isolation of pharmaceutical compounds during method development and quality control workflows
- Natural product isolation — separation and purification of natural product extracts using liquid-liquid partitioning
- Solvent washing — washing of organic extracts with aqueous solutions to remove water-soluble impurities during purification
- Partition studies — determination of compound distribution between organic and aqueous phases in pharmaceutical physicochemical characterisation
Pear Shape vs Squibb Shape — Choosing the Right Separating Funnel
The pear shape separating funnel is well suited to analytical-scale liquid-liquid extraction where precise and complete lower phase drainage is important. The narrow base concentrates the lower phase toward the stopcock outlet for clean and accurate separation. For larger-scale preparative extractions where maximising body volume per unit height is more important than narrow base drainage, the Squibb Shape Separating Funnel with PTFE Stopcock is available in the same capacity range.
Availability in Ireland
Glassco pear shape separating funnels are available from Varen Scientific — Ireland’s authorised distributor for Glassco laboratory glassware, supplied from the European warehouse in the Netherlands for fast delivery across Ireland. To request a quote, use the Request a Quote button above or contact our team directly. For further information on liquid-liquid extraction principles, refer to guidance published by the Health Products Regulatory Authority (HPRA).
