Separatory Funnel – 6,000mL

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A New, Large Format Separatory Funnel

– by Lab Society

Separatory Funnel

A 6000ml Separatory Funnel, with a 45/50 Rodaviss Outer Joint and GL-18 fittings.

Perfect for large-scale extraction.

After listening to our customers, we’re pleased to announce our new Separatory Funnel, now in a much larger, 6,000mL size! This new product has all of the same benefits of our earlier separatory funnels, with more customizability than ever.


  • GL-18 bottom connection,
  • Rodaviss Stopper,
  • PTFE Stopcock,
  • 6,000 mL. capacity,
  • American-made borosilicate glass.


The unique, semi-conical shape of these borosilicate glass funnels aids in separation, and they are incredibly easy to identify. The sloping or slanted sides of the glass make identification of the layers a breeze. On the top, you have a standard, taper joint, which can either house a rubber stopper or another connection.

Rodaviss Stopper.

The top outer joint (45/50) allows for quick and easy removal, and it prevents glassware from getting stuck together. Our new product has a black plastic ring below the glass protrusion on the dome. When the stopper is unscrewed, the ring presses up against the protruding glass and applies even pressure. The result is a safe disconnection of the joint, every time.

GL-18 Tip.

Removable GL-18 fittings are included, for connectivity to other pieces of glassware and for quick and easy transfer. The GL-18 connection also lets you choose multiple tips, so you can customize your set-up just the way you want it. Not only that, but you can attach a hose for easy drainage to a separate container or area.

If your set-up does not need the GL-18 cap, it may be easily removed and you can operate the funnel without it.

PTFE Stopcock.

For quick and easy flow control over your separatory funnel.

How does a separatory funnel work?

Separatory Funnel Diagram and Examples - Shop American-made Lab Glassware at Lab Society

When the separatory funnel has been filled with a multi-component liquid that contains a mixture of liquids of differing densities, the different densities will cause the fluids to naturally separate over time. The heavier substance (usually the desirable end product) will settle on the bottom, while the lighter substance (usually a clear solvent) will remain on the top.

Components will naturally separate over time.

To understand the effect, one need only know how oil and water behave when combined and left alone, due to their different properties. After they’ve separated, the vastly different visual properties of the individual components of the mixture will make it very obvious when separation is complete!

Load from the top, drain from the bottom.

You can pour your mixture right into the top of the glass at the opening. Make sure that the stopcock (the plastic valve at the bottom) is in the closed position, so no liquid will drain out from the bottom until you are ready.

Once the two liquids have settled, you can drain the bottom component using the stopcock.

You can also shake the funnel (while fully sealed, of course) to agitate the mixture, or simply invert it multiple times. Of course be careful not to shake too vigorously, as emulsions can result. In the case of excess vapor pressure, make sure you can properly vent the top.

Why shake?

Shaking increases the surface area of the liquids, allowing each solute to move to the solvent in which it’s soluble. They are immiscible, meaning they will not form an incorporated solution. The result is two visually distinct layers, easily visible through the clear glass.

The beauty of this system is that you can only drain your end product, leaving only the solvent behind in the separatory funnel. Done carefully, the results are remarkably effective. Make sure that when you open the bottom stopcock, you also open the top as well. This allows for the necessary pressure equalization for the process to occur as planned.

Watch out for pressure build-up!

When dealing with volatiles inside the separatory funnel (and shaking them), pressure can build up inside.

This pressure should be released after each shake via the top joint or by tilting the sep. funnel on its side, such that no liquid is in contact with the stopcock. The stopcock may can then be safely opened to release the built-up pressure.

You should repeat this process for each shake.

Safety notes:

If you are dealing with caustic or possibly harmful vapors, always make sure that you work with separatory funnels in well-ventilated lab, under a fume hood. In case of excess pressure, do not aim the top of the separatory funnel at your body (or worse, your face), and be sure to release pressure regularly to prevent excess build-up.

To support this glassware we recommend the 100mm Ring Stand and a 15cm I.D. Retort Ring.

Note: Product does not come with Ring Stand or Retort Ring or cap. You may purchase a Rodaviss Stopper or our 2-Port Inlet Adapter, depending on your needs!

Specification: Separatory Funnel – 6,000mL

Weight 20 lbs

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