I bought a couple of packets of Hallertau Hallertau pellets rated at 4.6%AA today . Other packets labelled just Hallertau were rated at 1.9%AA and because Im using them for mainly bittering, I went for the stronger.
On discusisg this with the HBS guy, he said that the 1.9% was the 2003 vintage while the 4.6% were 2002 vintage. Anyway, I just plugged the dates into Promash to see what sort of allowances I should make for age:
12month old (best case scenario) storage in air tight foil bags at 5deg goes from 4.6%AA to 3.14% AA
20months (probably more realistic) in the same conditions drops to 2.43%AA
So to get 30IBUs (at 60 mins) I need :
57 g at 4.6%AA
84 g at 3.14%AA
108g at 2.43 %AA
As you can see, theres a huge difference. Does anyone have any experience with the rates of AA loss? (apart from advice to buy fresh hops) Im Not too sure how to handle it from here..
On discusisg this with the HBS guy, he said that the 1.9% was the 2003 vintage while the 4.6% were 2002 vintage. Anyway, I just plugged the dates into Promash to see what sort of allowances I should make for age:
12month old (best case scenario) storage in air tight foil bags at 5deg goes from 4.6%AA to 3.14% AA
20months (probably more realistic) in the same conditions drops to 2.43%AA
So to get 30IBUs (at 60 mins) I need :
57 g at 4.6%AA
84 g at 3.14%AA
108g at 2.43 %AA
As you can see, theres a huge difference. Does anyone have any experience with the rates of AA loss? (apart from advice to buy fresh hops) Im Not too sure how to handle it from here..