AEB BIOCHEMICAL

AEB Fermoale AY4 - 500g

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Top-fermenting yeast strain for brewing American- and English-style ales.

It is known for producing clean, well-balanced ales with a neutral flavor profile. It typically contributes to a subtle malt character while allowing hop flavors and aromas to shine.

Compare to Fermentis Safale US-05.

Best For

Best For American & English Ale Styles

Quickly see where this product fits best in a professional brewing program.

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American Pale Ales & IPAs

Built for APA, IPA, and hop-forward American ales, where a clean, balanced finish keeps hop character in front.

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House Ale Programs

A versatile dry ale strain for breweries that want one dependable yeast across multiple ale brands.

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Brown Ales & Porters

Ferments clean in darker, malt-driven ales, with high flocculation that helps beers clear at the end of fermentation.

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High-Gravity Ales

A published 10–11% ABV tolerance supports imperial IPAs, strong ales, and other high-gravity fermentations.

Technical Specs

Quick Brewing Specifications

Yeast Type Ale / Top Fermenting
Species Saccharomyces cerevisiae
Origin Sierra Nevada, Chico, California, USA
Attenuation 84% | Medium
Fermentation Temp 61–73°F | 16–23°C
Flocculation High
Alcohol Tolerance 10–11% ABV
Ester Profile Medium
Sulfur Low
STA-1 Status Negative

Brewer Notes

Fermoale AY4

Versatile American ale yeast for APA, IPA, brown ale, porter, and other American- and English-style ales.

Why Brewers Use It

AEB Fermoale AY4 is a dry top-fermenting ale yeast selected for versatility across American- and English-style ales. AEB describes it as a classic Californian yeast strain. It delivers high attenuation with a clean, balanced finish, light malty character with a touch of citrus, and mild ester expression that keeps hop and malt character in the foreground.

Pro Brew Notes

AY4 is a strong choice for breweries that want one dependable ale strain across a range of brands, from session pale ales through high-gravity imperial styles. Its high flocculation helps beers clear at the end of fermentation, so brewers moving from a lower-flocculating strain may want to review dry-hop and diacetyl-rest timing on the first batch.

Best Fit

Best suited for hop-forward and balanced American ale programs where brewers want high attenuation, a clean neutral finish, and strong end-of-fermentation clarity from a single dry house strain.

Why Buy From Pro Brew Supply

Buy AEB yeast through Pro Brew Supply to combine yeast with malt, hops, nutrients, cleaning products, and other brewing supplies in one order. This helps reduce supplier complexity, improve total shipping efficiency, and keep production ingredients moving through one reliable source.

Brewer Resources

Brewing Builds Featuring This Product

See how this product fits into complete brewing builds with compatible malt, hops, yeast, and process aids.

Beer Style Build

American IPA Build

A hop-forward American IPA build pairing a clean Briess malt base with Citra, Mosaic, Simcoe, and Centennial, fermented dry with dependable American ale yeast.

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Beer Style Build

American Amber Ale Build

A malt-balanced American Amber Ale build — caramel and toast depth from Vienna and crystal malts, framed by classic American hops and clean ale yeast.

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Beer Style Build

Blonde Ale Build

An easy-drinking Blonde Ale build — pale, clean, and lightly malty, with soft hop balance and neutral ale fermentation built for wide appeal.

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Beer Style Build

American Pale Ale Build

A balanced American Pale Ale build — Pale Ale malt with light caramel depth, classic citrus-floral American hops, and clean ale fermentation.

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Beer Style Build

West Coast IPA Build

A dry, bitter, aroma-driven West Coast IPA build — pale and brilliant, with pine and citrus hop character over a lean 2-Row base and hard-flocculating ale yeast.

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Technical Resources

Documents & Product Support

Download technical sheets, safety documents, and product reference materials for this product.

TDS
TDS

AY4 Technical Data Sheet

Official technical data sheet with product specifications, fermentation performance, and brewing application information.

View TDS
SDS
SDS

AY4 Safety Data Sheet

Official Safety data sheet with product specifications, fermentation performance, and brewing application information.

View SDS
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About AEB Brewing

Biotechnology, yeast, and process solutions for modern breweries.

AEB Brewing provides professional brewing yeast, nutrients, enzymes, clarification aids, stabilizers, sanitation products, and process solutions for breweries looking to improve fermentation performance, consistency, and production control.
Italy Brewing Biotechnology & Process Aids

Why Brewers Choose AEB Brewing

•Professional brewing yeast portfolio
•Fermentation nutrients and process aids
•Enzymes for brewing performance and efficiency
•Clarification, stabilization, and filtration support
•Technical resources for craft and production breweries

Why Pro Brew Supply Carries AEB Brewing

We carry AEB because their yeast, nutrients, enzymes, clarification aids, stabilizers, and brewery process products give brewers access to a deeper technical toolbox. AEB fits well with the way Pro Brew Supply supports breweries: practical products, fast fulfillment, and help from people who understand brewing.

Buying AEB through Pro Brew Supply also lets breweries combine yeast and process aids with malt, hops, cleaning products, and other brewing supplies in one order. That means fewer supplier headaches, better shipping efficiency, and a more complete brewing solution from one source.

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