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