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B45 Gnome

Liquid Ale yeast from Imperial Yeast.

LabImperial Yeast· Ale · Liquid · B45

Specs

Attenuation
74–78%
The share of sugars the yeast ferments out. Higher attenuation means a drier, stronger beer.
Optimal temp
18–24°C
64–75°F
The range where this strain ferments cleanly, without throwing off-flavors. Most brewers pitch near the low end.
Flocculation
Med-high
How readily the yeast clumps together and drops clear once fermentation winds down.
Alcohol tolerance
≈12% ABV
The rough ABV ceiling where the yeast stresses out and stops fermenting.

Genetic traits

Phenolics
POF+
Clove & spice
Throws phenolics — the clove and spice notes (4-vinyl-guaiacol) behind hefeweizens, witbiers, and saisons. Expect a spicy character, not a clean one.
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

Ardennes / Achouffe (WLP550)
B45 = Ardennes Ale = OYL-024 = WLP550 = 3522

Usually used in

Belgian IPABelgian Pale AleBlonde AleTrappist SingleWitbierBière de GardeSaisonBelgian Golden Strong AleBelgian Dark Strong AleBelgian DubbelBelgian Tripel & Belgian Quad

Common questions

What is the B45 Gnome equivalent?
Ardennes Ale, OYL-024 Belgian Ale A, WLP550 Belgian Ale Yeast, and 3522 Belgian Ardennes — the same strain from other labs, the Ardennes / Achouffe (WLP550) strain.
What is B45 Gnome's attenuation?
74–78% apparent attenuation.
What temperature should I ferment B45 Gnome at?
18–24°C is the recommended range.
Does B45 Gnome produce phenolics (clove and spice)?
Yes. B45 Gnome is POF-positive — it makes 4-vinyl-guaiacol, the clove and spice character of hefeweizens, witbiers, and saisons.
Is B45 Gnome diastatic (STA-1)?
No. B45 Gnome does not carry the STA1 gene, so it attenuates normally with no diastaticus gushing risk.
What beer styles is B45 Gnome good for?
Belgian IPA, Belgian Pale Ale, Blonde Ale, Trappist Single, Witbier, Bière de Garde, Saison, Belgian Golden Strong Ale, Belgian Dark Strong Ale, Belgian Dubbel, and Belgian Tripel & Belgian Quad.
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