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Alcohol Tolerance in Beer Yeast and BeerSmith 3

Some brewers don’t realize that beer yeast, like all yeast has a limited alcohol tolerance.  In fact many some beer yeasts reach their limit below 8% ABV which can be a real problem for high gravity beers.

Yeast Alcohol Tolerance

Yeast is a one cell living creature.  As such it can only reproduce and grow within certain conditions.  One of those conditions includes the presence of alcohol.  Each yeast strain has a limit, called the yeast’s “alcohol tolerance” that indicates the level at which yeast cells start to go dormant and stop fermenting.  By convention, the alcohol tolerance is expressed as a percent Alcohol by Volume (%ABV).  Most major yeast suppliers do provide alcohol tolerance numbers for their yeast strains, though you may have to dive deep into the spec sheet to find it.… Read More

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