SafSpirit™ USW-6 Fermentis by Lesaffre


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SafSpirit™ USW-6 Fermentis by Lesaffre Yeast is the performer yeast in all types of grains or blends of grains.

SafSpirit™ USW-6 Fermentis by Lesaffre Yeast is the most famous and best performing strain for producing American Whiskey. The natural choice for the best Bourbons distillers and other American whiskey producers. Very good and delicate profile of congeners. Performs well in all kind of grains or blends of grains.

Despite its popularity for US whiskies, it is another good option for grain distilled beverages aged in barrels.


yeast (Saccharomyces cerevisiae), emulsifier: E491 (sorbitan monostearate)


  • 30-50 g/hl

Rehydration Instructions:

  1. Rehydrate the yeast in 10 times its volume of water or wort at 25°C – 35 °C (77.0°F – 95.0°F)
  2. Leave to rest for 15 minutes
  3. Gently stir
  4. Pitch in the fermentor


During transport: The product can be transported and stored at room temperature for periods of time not exceeding 3 months, without affecting its performance.

At final destination: Store in cool (<10°C/50°F), dry conditions.

Shelf Life:

Refer to best before end date printed on the sachet.

Opened sachets must be sealed and stored at 4°C (39°F) and used within 7 days of opening. Do not use soft or damaged sachets.

Typical Analysis:

% dry weight 94.0 – 96.5
Viable cells at packaging > 15 x 109 /gram
Total bacteria* < 1 x 104/gram
Acetic acid bacteria* < 1 x 103/gram
Lactobacillus* < 1 x 104/gram

Pathogenic micro-organisms: in accordance with regulation

Technical Data Sheet