White Labs Yeast | WLP004 Irish Ale | PurePitch® Next Generation

White Labs Yeast | WLP004 Irish Ale | PurePitch® Next Generation

$14.99
White Labs WLP004 Irish Ale Yeast delivers a smooth, dry finish with enhanced roast character, making it ideal for stouts and traditional malty ales.
  • Smooth, dry finish with roast character
  • Great for malty British styles
  • Medium to high flocculation
  • 70 mL pouch treats a 5 gallon batch

Ice pack:

Ice Packs / Shipping:For best results, we strongly recommend adding an ice pack to your liquid yeast order. Ice packs do not guarantee that yeast will arrive cold, but will keep yeast colder for longer during transit. We can not replace yeast that arrives warm. In warm weather months, we highly encourage choosing dry yeast. Liquid yeast is final sale. As a live, perishable ingredient that requires refrigeration, we are unable to accept returns or exchanges once an order has left our warehouse.

Storage: Store in the fridge (33–38ºF). Do not freeze. Pitch cold - do not warm to room temp prior to pitching. Use within 4 months for direct pitching. For pouches older than 4 months, or that are warm, use a yeast starter to boost cell count.

Fermentation Temp Range
Each yeast strain has a temperature range where it performs best. Lagers require cooler temps, while Kveik yeasts can ferment in extreme heat. Maintaining the proper fermentation temperature for each yeast strain is crucial its health. Matching a yeast's ideal range to your environment (or your ability to control temp) is key to getting clean, consistent results.
Scale from 30°-120°F
Product Analysis
This typical analysis is not to be construed as product specification. Typical analysis represents average values, not to be considered as guarantees, expressed or implied, nor as a condition of sale.

Yeast Format, Liquid
Yeast Style, Ale
Flocculation, Medium to High
Attenuation, 69~74%
STA1, Negative
Fermentation Temperature Range, 65~68°F
Alcohol Tolerance, 5~10%

WLP004 Irish Ale Yeast originates from a renowned Irish brewery and is known for promoting roasted malt expression while finishing clean and dry. It enhances coffee, chocolate, and caramel notes without overwhelming sweetness.

With attenuation between 69–74% and medium to high flocculation, this strain produces clear beer with a structured, balanced body. Ferments best between 65–68°F and performs reliably in malt-driven recipes.

WLP004 excels in dark and malt-forward ales.

Ideal for:

• Irish Dry Stout
• Porter
• Brown Ale
• Red Ale
• English Bitter
• Scotch Ale

• Store refrigerated at 33–38°F
• Do not freeze
• Pitch cold into well-oxygenated wort
• Ferment between 65–68°F
• Use within 4 months for best viability
• Consider a starter for higher gravity beers or older pouches

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White Labs Yeast | WLP004 Irish Ale | PurePitch® Next Generation
From $14.99

Frequently Asked Questions

WLP004 promotes roasted malt character with a smooth, dry finish and subtle fruitiness.

Yes. It is especially well suited for Irish dry stouts and other roast-forward ales.

Each 70 mL PurePitch® Next Generation pouch contains approximately 150 billion cells, designed to treat 5 gallons of wort.

Ferment between 65–68°F for balanced attenuation and clean roast expression.

For standard gravity 5-gallon batches, a starter may not be required. For higher gravity beers or older yeast, a starter is recommended.

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