Erlenmeyer flask

The Erlenmeyer flask was in 1860 by Emil Erlenmeyer ( 1825-1909 ) - developed - a German chemist. He is a glass vessel with a - in contrast to the beaker - upwards narrowing neck. It is used as a laboratory instrument. In laboratory use, there are various versions of the Erlenmeyer flask, the narrow neck (DIN 12380/ISO 1773) and the wide neck shape (DIN 12385 ) with beaded rim and graduation and depending on the application flask with standard ground joints (DIN EN ISO 4797 ), for example, for nebulizer or Jodzahlkolben with and without collar.

By the tapered neck is a risk that the addition of substances, the pan, stirring or boiling liquid from the piston to escape in an uncontrolled manner, significantly smaller than in beakers.

Thus, in an Erlenmeyer flask comfortably eg mixed liquids or dissolving processes through - even relatively heavy - pan or stirring speeds. He is - as the round-bottom flask - also good for the magnetic stirrer, but can be turned off directly because of its flat bottom. ( The round-bottom flask, however, requires a cork ring or a tripod for the solid state, the latter makes a pan with your hand or a frequent inspection by holding the backlight impossible. )

Thin-walled Erlenmeyer flask must not be subjected to a vacuum, since there is danger of implosion because of the flat bottom. A thick-walled special form of the Erlenmeyer flask, the flask.

Erlenmeyer flasks are mainly made ​​of glass ( today mainly Borosilikatglas ) made ​​, but sometimes also made ​​of various plastics such as polycarbonate, polyethylene terephthalate copolyester (PETG ), polymethyl pentene, polypropylene or polytetrafluoroethylene ( PTFE). There are also exotic models with screw cap and flask with baffles at the bottom for better mixing. The volumes range 25-5000 ml

Wide-mouthed Erlenmeyer flasks were formerly known as boobies.

Erlenmeyer flask, original drawing

Erlenmeyer flasks 500 ml

Erlenmeyer flask 50 ml narrow mouth

Erlenmeyer flask 50 ml wide- neck ( Maulaffe )