The 250 mL Erlenmeyer Flask is an essential tool for yeast culturing and laboratory analysis in the brewery. Made from laboratory-grade borosilicate glass, it is thermal-shock resistant, allowing you to move it from a flame to an ice bath safely. Its narrow-neck design is ideal for use with magnetic stir bars and stir plates, providing maximum oxygenation for healthy yeast cell growth during the initial stages of a starter or for propagation from a slant. Brewery Safety Tip: While borosilicate is tough, always inspect the flask for chips or hairline cracks before heating. Use a foam stopper or a piece of sanitized aluminum foil to cover the neck to allow for gas exchange while keeping contaminants out. For the best yeast health, use this size for small-scale culturing before stepping up to a larger 2000 mL flask.
