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T-90 Hop Pellets are whole hops that have been ground and pressed into a mold. Pellets contain all the vegetative and lupulin material of raw leaf hops and can be used as a full replacement for leaf hops in the brewing process. In the milling process, resin glands in the buds are ruptured and lupulin is spread over all particles. The resins seal the outside of the hop pellets when they are pressed, leaving the interior fresh.
Preparation: Baled hops are broken up and passed into an air-stream which delivers them to a hammer-mill. Heavy foreign materials drop out and metal fragments are removed using magnets. The cone hops are milled until they pass through a sieve which is commonly a 9-12 mm mesh.
The powder from many bales is mixed and homogenized in a blender and then conveyed to a pellet die, most commonly 4 or 6 mm in diameter. The pellets are immediately cooled, normally to a temperature of between 1 - 7º C. Cooled pellets pass over a shaker where dust is removed and recirculated back through the system. The "clean" pellets are packaged in laminated, plastic/aluminum foil bags, vacuum sealed and boxed.
Uses and Advantages in Brewing: T-90 pellets achieve a significant reduction in bulk volume compared to leaf hops. Additionally the packaging prevents the deterioration brought about by oxidation of the resins and oils of leaf hops.
Within the brewing process T-90 pellets may, depending upon the circumstances, show an increase in the utilization of alpha acids of up to 20% over that of leaf hops. Standardization of the alpha acids content of T-90 pellets allows the more of accurate and consistent results for the brewer.
Methods of Use: T-90 pellets are added to boiling wort in the kettle at the same time as one would normally add leaf hops. The pellets will disperse into the wort and form part of the trub thus removing the need for a hop strainer. For maximum bitterness, pellets should be boiled for at least one hour. For maximum aroma contribution, pellets should be added as for normal late hop additions.
Typical Brewing Performance: Alpha acids utilization from pellets, under normal brewing conditions, range between 30-35%. The flavor and aroma effects are typical for the variety in question and the time of addition.
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