500 mL Erlenmeyer Flask

The 500 mL Erlenmeyer Flask is a heat-resistant borosilicate glass flask designed for preparing yeast starters and propagating brewing yeast prior to fermentation. Ideal for 1 to 3 gallon beer batches, this laboratory-style flask allows homebrewers to prepare starter wort, grow yeast cell counts, and improve fermentation performance. Its conical shape supports easy swirling and mixing while helping reduce spills during yeast starter preparation.

Constructed from borosilicate glass, this flask is designed to withstand rapid temperature changes during brewing workflows. Unlike standard glassware, it can safely move from heat to cooling applications such as ice baths when handled properly. The flask is compatible with magnetic stir plates, making it suitable for continuous yeast starter agitation and oxygen exposure during propagation.

The flask features a 500 mL (0.5 L) capacity and measures approximately 7 inches tall by 4.25 inches wide at the base. It is suitable for heating starter wort and preparing small-volume yeast cultures before pitching into beer fermentations. While the flask may be used with gas stoves or double boiler methods, direct contact with electric burners is not recommended due to potential thermal stress on the glass.

To use, prepare starter wort directly inside the flask, cool to yeast-safe temperatures, and pitch brewing yeast into the starter. Swirl periodically or place on a compatible stir plate to keep yeast suspended during propagation. After use, hand wash carefully to maintain the integrity of the borosilicate glass.

Widely used in homebrewing yeast propagation setups, the 500 mL Erlenmeyer Flask provides a reusable vessel for yeast starter preparation, stir plate fermentation support, and small-scale brewing laboratory workflows.