Separatory Funnels

Separatory funnels are used to dispense liquids into other containers, usually as part of an extraction process. They are made of glass. Usually a ring stand is used to support them. Separatory funnels are open at the top, to add liquid and allow for a stopper, cork, or connector. The sloping sides help make it easier to distinguish layers in the liquid. The flow of liquid is controlled using a glass or teflon stopcock. Separatory funnels are used when you need a controlled flow rate, but not the measuring accuracy of a burette or pipette. Usual sizes are 250, 500, 1000, and 2000 ml.