Dropping funnels

Dropping funnels are used for precise dispensing of liquid substances, most often to substrates for a chemical reaction discharged in a flask during ongoing analyses or chemical syntheses. A standard dropping funnels consists of a vessel with a cylindrical, pear-shaped or conical shape and has a female ground on one side and a leg with a faucet and male ground on the other. Some types of dropping funnels also have an approximate volume scale, which is usually drawn "upside down" in order to allow observation of the rate at which the chemical is dropping in. We offer droppers made of borosilicate glass with a glass stopcock and a stopcock made of PTFE. The droppers can also have a thin tube connecting the leg to the vessel, the purpose of which is to provide pressure equalization during dropping, which allows dropping when the top opening is closed. The pressure equalization tube is particularly important when conducting reactions in an inert gas atmosphere or at a pressure other than atmospheric. The older type dropping funnels used glass faucets, ground their price is lower than those in which the faucets are made of PTFE, while with these faucets, however, it is difficult to precisely control the rate of dropping. The problem that often occurred was the inability to ensure their tightness. Faucets made of PTFE are more accurate and the volume of the dripped medium can be controlled more precisely. Even the best and most accurately designed droppers do not provide high precision control of the rate of dropping, which can be important when dispensing a chemical. For reactions that require high substrate dosing, flow pumps are recommended. Dropping funnels with glass (borosilicate) or Teflon stoppers are available in a range of capacities from 50 to 500 ml. They have an internal ground, an external ground and a stopcock. The dropping funnels is in accordance with DIN 12567 and ISO 4800. The scale division is according to the volume of the dropper and ranges from 1 ml up to 10 ml. The selection is left to the user, who must decide for himself what kind of dropper he needs. Droppers are very commonly used vessels in the laboratory. They are simple to make and use, while in many chemical processes they are simply indispensable. Droppers are often used in chemical reactors, where droppers are mounted on one (or more) of the reactor's spigots with the substances that currently need to be added to the reaction mixture. Our regular offer includes droppers made of borosilicate glass, while on your request we are able to provide an offer for droppers made of PP or PE, we encourage you to make inquiries. We are able to undertake on your request to make the dropper in the shape and size you need. Please specify the material of manufacture and the desired flow rate.