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500ml Borosilicate Glass Erlenmeyer Flask
500ml Borosilicate Glass Erlenmeyer Flask

Glass Erlenmeyer Flask (500 ml)

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Named for German chemist Emil Erlenmeyer, homebrewers use Erlenmeyer Flasks for making yeast starters. Erlenmeyer flasks are recognizable by their conical shape, with most displaying volume markers. They have a broad base that narrows at the top to a short neck with a beaded lip and various size openings that accommodate stoppers and bungs.

Making a yeast starter is essential for proper pitching rates and reducing lag time when fermentation begins (this greatly minimizes the chances of bacterial infection in your batch). Starters will supply more yeast than your standard vial or package. If you want to put a stopper on your 500 ml flask, the right size to use is #7. Made from borosilicate glass, which means it can be moved from a boil on your gas stove to a cold water bath for cooling without the risk of cracking. (We do not recommend the use of an electric element. If you cannot avoid this, we recommend using a larger pot as a hot water bath on the stove.) With flasks, your yeast starter process can be completed all in one container. Not only does this keep things simple, but the fewer the vessels, the less risk for contamination.

Why make a yeast starter?

Yeast starters ensure healthy yeast. By creating a yeast starter 1-3 days in advance of your brew day, you will ensure that your yeast is healthy and robust enough to do its job. Secondly, making a starter allows you to create more yeast to use. This increase of the cell count will give you a better chance of keeping bacteria and wild yeasts from fermenting in your wort. If you are planning to brew a high gravity beer (1.060+), you will need more yeast to start the fermentation faster. High-gravity beers will also have a better chance of completing fermentation with ample quantities of yeast (less chance of stalling out).

Please Note: In the lab world, these Erlenmeyer flasks are "Student Grade" (Student grade is not the highest grade flask and will have minor defects). An excellent container for making yeast starters!
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