Hop hash and lupulin powder

Both products concentrate the lupulin glands

The aroma and bitterness of a hop cone sit in its lupulin glands, the small yellow sacs of resin and oil at the base of each bract. The rest of the cone is leaf and stem: vegetal matter that carries polyphenols, grassy flavours and a lot of surface area that soaks up beer.

Lupulin powder is made by separating those glands from the leaf at very low temperature, where the resin becomes brittle and the two fractions can be sieved apart. The result is a powder with roughly double the alpha acid and oil of a standard T90 pellet by weight. Products sold under names such as Cryo and LupuLN2 work this way.

Hop hash is different. It is the sticky resin that builds up on pelletising equipment during processing, scraped off and sold as a concentrated by-product. Supply is limited and the product varies more from lot to lot.

Dose by oil, not by weight

The common starting rule is to replace T90 pellets with about half their weight of lupulin powder. If your IPA takes 8 g per litre of pellets in the dry hop, try 4 g per litre of powder for the same hop. Then taste and adjust.

The better habit is to dose by total oil. If a pellet lot has 1.5 mL of oil per 100 g and the powder lot has 3.0 mL per 100 g, the ratio is exactly two to one. When the certificates show different numbers, recalculate rather than reuse last year's rate. Hop hash rarely comes with a full specification, so treat it as experimental and dose small.

Less leaf means less beer lost and less grassiness

Pellet dry hops at commercial rates leave a thick bed of sludge in the cone. That sludge holds beer. Halve the plant matter and you get some of that beer back. On a 10 hl brewhouse making heavily hopped IPAs, the recovered volume over a year is worth working out with your own numbers: litres lost per batch with pellets, litres lost with powder, multiplied by batches and by your cost per litre.

Flavour shifts too. With less leaf there is less grassy, vegetal character and less of the astringency that heavy pellet dry hops can bring. Some brewers find the powder gives a cleaner, more resinous result. Others miss a little of the depth pellets give. Many use a blend.

The powder clumps, floats and picks up oxygen

Lupulin powder behaves badly in a tank. It is fine, light and oily, so it floats and forms clumps that resist wetting. Tipped through an open manway onto a fermenting beer it can foam over violently as nucleation sites release dissolved CO2.

It also brings air with it. Every opening of the tank lets oxygen in. Oxygen picked up in the dry hop stales hop aroma within weeks. A closed dosing vessel purged with CO2, or a hop doser connected to the tank, keeps pickup down. If you dose through the top, purge the headspace afterwards and recirculate gently to wet the powder.

Bitterness can still climb

Dry hopping adds no iso-alpha acids in the classic sense, because there is no boiling. It does add other hop compounds, such as humulinones, that contribute bitterness of their own. At the high concentrations a lupulin product delivers, a beer can taste noticeably more bitter than its kettle IBU suggests. If a hazy IPA turns harsh, the dry hop rate is the first suspect.

Measure it if you can. A bitterness reading before and after dry hopping on the same batch tells you more than any rule of thumb.

Store it colder than pellets

A higher concentration of oil means more to lose. Keep sealed packs frozen, ideally well below 0 °C. Use opened packs within days. In an Indian cold room that cycles with power cuts, check the temperature log before trusting it. A pack that has warmed and cooled repeatedly will smell flat and cheesy long before its best-before date.

Here is a first step. On your next IPA, split the dry hop: half the tanks with your usual pellet rate, half with powder dosed by oil content. Record the volume recovered from each tank and run a blind triangle test with your team on the finished beers.