Abbey IV Ale Yeast | White Labs WLP540 Yeast | Vault Strain
White Labs WLP540 Abbey IV Ale Yeast for Complex Belgian Abbey and Strong Ales
White Labs WLP540 Abbey IV Ale Yeast is a Belgian monastery-style strain for brewers who want classic abbey character with a medium fruit profile, good attenuation, and enough structure for dubbels, tripels, Belgian pale ales, and Belgian strong ales. It sits in a useful middle ground for Belgian brewing, more expressive than cleaner abbey strains but not as fruit-forward as the biggest ester producers in the category.
White Labs lists this strain at 74% to 82% attenuation, medium flocculation, and a fermentation range of 66 to 72°F. It is STA1 negative and is well suited to Belgian-style ales where fruit complexity, dryness, and yeast-driven character all matter in the finished beer.
What White Labs WLP540 Contributes to Beer
- Balanced Belgian fruit character: Medium ester expression that works well in abbey-style ales without overwhelming the malt bill
- Good attenuation: Helps finish stronger Belgian beers with more polish and drinkability
- Useful middle-ground profile: Strong enough to shape the beer, but controlled enough for more recipe flexibility
- Solid cellar behavior: Medium flocculation supports practical clarification and handling
White Labs WLP540 Specifications
- Attenuation: 74% to 82%
- Flocculation: Medium
- Alcohol tolerance: Medium to High
- Fermentation temperature: 66 to 72°F (19 to 22°C)
- STA1: Negative
Best Styles for WLP540 Abbey IV Ale Yeast
- Belgian Dubbel
- Belgian Tripel
- Belgian Dark Strong Ale
- Belgian Pale Ale
- Other abbey-style and monastery-inspired ales
Why Brewers Choose WLP540
WLP540 is a strong choice when you want Belgian yeast character to help define the beer without turning the profile too fruity or too aggressive. It brings enough fermentation complexity to keep traditional Belgian ales interesting while still leaving room for pilsner malt, candi sugar, specialty malt, and hop structure to show clearly.
For brewers building layered Belgian ales with classic abbey structure and a dry finish, WLP540 remains a useful and flexible White Labs strain.
Liquid Yeast Storage and Shipping
We store liquid yeast in temperature-monitored refrigeration to help maintain yeast health until shipment. Once a liquid yeast package is in transit, weather and carrier handling are outside our control, so customers should choose shipping protection based on season, transit time, and personal risk tolerance.
Expedited shipping, insulated packaging, and ice packs are often worth considering for liquid yeast. Dry yeast is generally much less risky to ship than liquid yeast.
Related Yeast and Brewing Resources
Browse our full range of White Labs yeast strains if you want to compare more Belgian fermentation options. You can also review our yeast shipping best practices page before ordering liquid yeast in warmer weather.
If you want a Belgian abbey strain with balanced fruit, good attenuation, and traditional strong-ale range, White Labs WLP540 is a strong option.