Glass jars for freezing pellets?

[MaxStout]

The other reason I don’t like plastic alone is that the O2 permeability is not zero. According to the analysis in the FoodSaver Mylar roll Amazon link, the “leading” plastic bags (Which are presumably FoodSaver) range from 34-55 cc/m^2 per day, at one atmosphere and 100% oxygen. For a 10”x12” bag that works out to over 5 cc/day. Of course, air is not 100% O2 and the pressure differential isn’t one atmosphere, but I’m guessing it’s closer to 1 cc/day than not. In any case, I’m confident that you get more much O2 ingress in a plastic bag than in a properly sealed mason jar. There will be a crossover point where the mason jar is better. The only question is how many days it actually is and how frequently do you open the bag/jar?

Maybe somebody on that Amazon "calculation" misplaced a decimal place or two. The sealed bag I have pictured above was last sealed about 3 months ago. At 5cc/day, that thing should look like a pillow.

I have a 1lb pkg of pellet hops I vac sealed in 2020, and it's still stiff as a brick, sitting in my deep freeze.

In contrast, a mason jar evacuated 80% by a Foodsaver will have 20% air, or about 3psi. The partial pressure of the O2 will be ~0.6psi. Put another way, if there's, say 500ml of space inside a typical quart jar full of hops (low packing density), you have the equivalent of 20cc of O2 at 1 atm from the beginning.

The jar method could work if you use a pump that pulls a higher vacuum.

 

[day_trippr]

At 5cc/day, that thing should look like a pillow.

Permeability works both ways. If O2 is crossing barriers in one direction it's also crossing in the other.

Cheers!