A04 Barbarian
Liquid Ale yeast from Imperial Yeast.
Lab
Imperial Yeast· Ale · Liquid · A04
Imperial Yeast· Ale · Liquid · A04Specs
Attenuation
73–74%
The share of sugars the yeast ferments out. Higher attenuation means a drier, stronger beer.
Optimal temp
17–21°C
63–70°F
The range where this strain ferments cleanly, without throwing off-flavors. Most brewers pitch near the low end.
Flocculation
Medium
How readily the yeast clumps together and drops clear once fermentation winds down.
Alcohol tolerance
≈10% ABV
The rough ABV ceiling where the yeast stresses out and stops fermenting.
Genetic traits
Phenolics
POF−
Ferments clean
Phenolically clean (POF-negative). No clove or spice, so malt, esters, and hops come through unmasked. The norm for American and British ales and most lagers.
Diastatic
STA-1−
Not diastatic
Does not carry the STA1 (diastaticus) gene. It attenuates normally, with no diastaticus over-attenuation or gushing risk.
Same strain, other labs
Usually used in
American Pale AleBlack IPAWhite IPAImperial IPAEnglish IPARed IPARobust PorterAmerican StoutWinter Seasonal BeerAmerican BarleywineImperial StoutAmerican Strong AleWheatwineCream Ale+3 more
Common questions
- What is the A04 Barbarian equivalent?
- Vermont Ale, LalBrew New England, OYL-052 DIPA Ale, and WLP095 Burlington Ale Yeast — the same strain from other labs, the Conan (Vermont Ale) strain.
- What is A04 Barbarian's attenuation?
- 73–74% apparent attenuation.
- What temperature should I ferment A04 Barbarian at?
- 17–21°C is the recommended range.
- What beer styles is A04 Barbarian good for?
- American Pale Ale, Black IPA, White IPA, Imperial IPA, American Pale Ale, English IPA, Red IPA, Robust Porter, American Stout, Winter Seasonal Beer, American Barleywine, Imperial Stout, American Strong Ale, Wheatwine, Cream Ale, American Wheat Beer, Blonde Ale, and American Amber Ale & American Brown Ale.
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