1000ml Erlenmeyer Flask

The 1000 mL Erlenmeyer Flask is a heat-resistant borosilicate glass flask designed for preparing yeast starters and propagating brewing yeast before fermentation. Recommended for 5 gallon beer batches, this laboratory-style flask allows homebrewers to prepare starter wort, increase yeast cell counts, and support healthier fermentations. Its tapered shape makes swirling and mixing easier while helping reduce spills during yeast starter preparation.

Constructed from borosilicate glass, the flask is designed to handle temperature changes commonly encountered during brewing workflows. Unlike standard glassware, it can move from heating to cooling applications, such as stovetop to ice bath, when used properly. The flask is also compatible with magnetic stir plates for continuous agitation during yeast propagation.

This is the same 1000 mL Erlenmeyer Flask included in the Craft a Brew Yeast Starter Kit. The flask features a 1000 mL capacity and measures approximately 8.5 inches tall by 4.25 inches wide at the base. It is intended for preparing starter wort and propagating yeast prior to pitching into beer fermentations. Gas stove heating or double boiler methods are recommended, while direct contact with electric burners is not advised due to the potential for thermal stress on the glass.

To use, prepare starter wort directly in 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 borosilicate glass surface and clarity.

Widely used in homebrewing yeast propagation workflows, the 1000 mL Erlenmeyer Flask provides a reusable solution for yeast starter preparation, stir plate use, and fermentation support for larger beer batches.