Defoamers - Quirky Homebrew Supply

FermCap AT 1kg

Chris Muench — Mon, 11 May 2026 18:21:08 +0000

FermCap® AT is a unique emulsion of an extremely effective surface active agent Dimethylpolysiloxane which prevents foam formation by reducing surface tension. FermCap® AT is classified as a “Process Aid” because of its novel feature of being completely removed from the beer under normal processing conditions. It is adsorbed onto the surface of the yeast, vessel walls and filter media.

Analytical techniques accurate to 0.005 ppm cannot detect FermCap® AT in finished beer.

To be used as an antifoam agent during the wort boiling and fermentation step of the brewing process, the dose rate depends on brewing conditions, wort gravity, yeast cell counts and temperature. The ingredients of this product may settle. For best results, the closed package should be shaken vigorously before use. Do not freeze, store below 90º F.

Application rate: 1 – 6 mls per hL

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Five Star Kettle Defoamer 105 – 1 Gallon

gregradz — Tue, 20 Feb 2024 21:42:39 +0000

Instructions
Should be added to kettles while boiling and fermenters.
Add as needed, but begin with a couple of drops.
A typical starting point is 0-1oz for 7BBLS system.

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Foam Control (FermCap S) – 1oz

Jeff Daigle — Tue, 27 Jun 2023 18:03:05 +0000

Eliminate the head on fermenting beer and brew a larger quantity in your existing fermenter. Foam control - also known as FermCapS - does not affect the head on your finished beer, but can actually increase the head by retaining head-forming compounds that would have been blown off during ferment. It will settle-out of beer before bottling or kegging as it is actually absorbed onto the surface of the yeast cells and filter media. Add two drops per gallon at start of fermentation. Comes packaged in a very handy eye dropper bottle that allows for easy use. 1 oz is good for about 50 x 5-gallon batches of beer. Also available in bulk 1 gallon size.

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FermCap AT 4kg

Jeff Daigle — Wed, 10 May 2023 18:41:08 +0000

Analytical techniques accurate to 0.005 ppm cannot detect FermCap® AT in finished beer.

Application rate: 1 – 6 mls per hL

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FermCap S 500g

Jeff Daigle — Thu, 23 Jan 2020 23:54:35 +0000

Kerry FermCap® S is a unique emulsion of dimethylpolysiloxane. It is an extremely effective, surface active agent that prevents foam formation during fermentation by reducing surface tension. Reduced foaming increases fermentation capacity and prevents mess, improves alpha-acid utilization and CO2 recovery, and prevents hazes due to collapsed foam. Because of the novel behavior of FermCap®, it completely adsorbs onto the yeast, vessel walls, and filter media. No FermCap® remains in the finished beer.

FermCap® S should be stored below 85°F, but should not be allowed to freeze.

Recommended usage: Shake vigorously before use. For 5 gallons, mix 0.2-1.6 grams into wort when it is transferred into the fermentation vessel. If not added before pitching yeast, FermCap® should be applied as a spray to the fermenting wort to avoid mixing with the yeast. Higher rates of use or additional doses may be called for if the wort contains large amounts of trub (solids), if the wort is highly viscous, if the fermenting vessel is tall and narrow, if the fermentation temperature is high, or if foam is plentiful or robust for any other reason.

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FermCap S 4kg (formerly 4L)

Jeff Daigle — Tue, 13 Feb 2018 03:31:19 +0000

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FermCap, Kerry 15g

Jeff Daigle — Tue, 13 Feb 2018 03:16:29 +0000

FermCap® S should be stored below 85°F, but should not be allowed to freeze.

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Five Star Kettle Defoamer 105 – 2oz

Jeff Daigle — Tue, 13 Feb 2018 02:38:47 +0000

Instructions
Should be added to kettles while boiling and fermenters.
Add as needed, but begin with a couple of drops.
A typical starting point is 5-10 drops per 5 gallon batch.

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