Dropping Funnel

The dropping funnel, also called an isobaric dropping funnel, is a laboratory instrument made of borosilicate glass (such as LBG 3.3) used for the controlled addition of liquids, usually dropwise.

Its main features are:

Function: It allows the precise and controlled addition of a liquid reactant to a reaction medium, particularly for rapid or exothermic reactions where slow addition is crucial to avoid runaway reactions or explosions.
Isobaric Design: Unlike the separating funnel, the dropping funnel’s stopcock is located higher on the stem, and a thin glass section below the stopcock slows the flow by capillary action, allowing finer flow control.
Material: It is made of borosilicate glass for its resistance to heat and chemicals.
Controlled atmosphere use: It can be used in systems under an inert atmosphere (argon, nitrogen) if the reagent is sensitive to air or moisture.
Variations: It is available in various capacities (50 ml, 250 ml, 500 ml, 1000 ml). It is equipped with a PTFE stopcock for improved sealing and chemical resistance.