Laboratory & Chemical
Pear-shaped borosilicate separating funnels with PTFE stopcock and stopper, 50 ml to 2 L, for liquid-liquid extraction and phase separation.
Specification
Product Knowledge
Background, typical uses and selection points for this product. We can send model drawings, technical data and samples to support your evaluation.
A separating funnel is the standard tool for liquid-liquid extraction. Two immiscible liquids, typically an aqueous layer and an organic solvent, are shaken together so a compound moves into one phase, then left to settle into distinct layers. The stopcock at the base lets the lower layer run off cleanly.
The pear shape gives a clear interface between the layers and tapers to a narrow outlet, so the boundary is easy to see and the lower phase can be drained precisely.
Separating funnels are used for liquid-liquid extraction, washing and drying organic layers during synthesis work-up, solvent extraction and sample cleanup before analysis. They are standard glassware in synthesis and research labs, pharmaceutical and natural-product chemistry, environmental sample preparation and organic chemistry teaching labs, where students learn extraction technique on 100 ml and 250 ml sizes. Larger 1 L and 2 L funnels handle preparative work-ups and bulk sample extraction.
Each funnel has a pear-shaped borosilicate 3.3 body with a ground-glass neck for the stopper at the top and a PTFE stopcock at the base leading to a delivery stem. PTFE needs no grease, so it doesn’t contaminate extracts, and it resists almost all solvents. The stopper seals the top for shaking, and stopper and stopcock are fitted to each funnel.
Support the funnel in a ring stand and fill to no more than about two-thirds. Invert and vent through the stopcock often while shaking, especially with volatile solvents or reactions that release gas, since pressure builds quickly. Let the layers settle fully before draining, remove the stopper before opening the stopcock, and keep each stopper and stopcock with its own funnel.
We blow the bodies from borosilicate 3.3, grind the stopper joint, fit a machined PTFE stopcock and anneal each funnel. Stopcock and stopper fit, for leak-free shaking, and a clean stem are the key production checks. Options include conical (Squibb) or cylindrical bodies, glass or PTFE stoppers, graduated versions and standard-taper joints on the stem. Send us your sizes and quantities for a quote and samples.
Customization
We specify the container, closure, decoration and transit packing as one package, so every part fits and arrives ready for your filling line.
Choose from standard sizes or request a custom capacity. We supply drawings with tolerances, label panel dimensions and nominal and brimful capacity.
We match caps, liners, pumps, droppers and stoppers to the neck finish and check the seal against your contents and filling process.
Flint, amber and colored glass, with frosting, spray coating, screen printing, hot stamping or labels. Material documentation is available on request.
Partitioned cartons, layer pads or bulk pallets, with shipping marks and pallet patterns planned for your route and warehouse.
Applications
Typical markets and uses. Tell us your contents, filling process and storage conditions and we will recommend the right model and components.
We confirm availability of the standard model, and review any changes to size, color, decoration or tooling for feasibility and lead time.
We send samples and specification sheets so you can check dimensions, component fit and finish before you place the order.
Your quotation covers packing design, shipping route, Incoterms and export documents, so landed cost is clear from the start.
Bulk Quote
Tell us the quantity, specifications and destination. We will reply with pricing, lead time, sample options and technical data for your chosen model.