Dropping Funnels

Dropping Funnels Manufacturers and Suppliers

This is the iconic dropping funnel, it consists of a graduated cylinder tube or pear-shaped bulb, which has an additional narrow-bore glass tube that begins from top of the bulb, usually has a small deformation upwards and continues to the base of the funnel, connecting with the lower tube, in the space below the stopcock and above the male ground glass joint. The purpose of this tube is to replace the liquid volume lost in the bulb with the equivalent gas volume from the flask into which the reagent is flowing. This allows the liquid from the funnel to drop smooth without having to remove the stopper, which is necessary when needing to add exact amounts of liquid from the dropping funnel and when handling air-sensitive reagents in a sealed, inert-gas environment. Without this tube, or some other means to equalize the pressure between a sealed receiving flask and the bulb of the funnel, the flow of fluid from the bulb will rapidly come to a halt.