7 LBS 3A Molecular Sieve, Premium Quality Desiccant Bulk Material

This lowers the humidity level in a air tight storage box way lower then traditional silica beads. Humidity level has gotten as low as 4 percent. I did place a fan inside the air tight storage box also, one awesome thing I noticed was that it actually removed water out of my filament, I weight the filament on food scale before putting it in the box and after 2 days it dropped weight by .20oz which would be 5.9 ml. Was not expecting that.

For 190 proof ethanol equal volumes will dry the ethanol. For wetter ethanol, distillation is first needed. Produces a lot of heat, so apply incrementally. Not cheap, but can be regenerated in a very hot oven, I think it takes 12 hours.

Quality product

These are true to what the manufacturers claim. Not all sieves are accurate in their specs.

Bought for 3D printing filament.I bought a Polymaker Polydryer+Box I dried a fresh roll of vacuum sealed (w/desiccant) Creality PETG for about three days. When I initially put it in I believe it was around 32% right after I opened everything and pooped it in. Around 12 hours later 27%, two more days of 12-14 hour heating and I was able to get it to 19%. After two days off the heater it rose to 22% in the dry box. I just dumped this in the bottom of the poly box two and a half hours ago. It's at 10%. I don't think this dinky hygrometer they send with the Polydryer+Box is capable of displaying less than 10%. I bet it's even lower.Really, really, impressed. Put this around your filament rolls for storage and you'll be good to go fellas/fellets.

This works much better than silica gel to get to low humidity. Baking it in an oven at 550f worked for me to get it back the same dryness as how it was when I first opened the container. I weighed it on a scale before using it, let it absorb about 20% of its mass in water vapor, and was able to dry it in a few hours. I stopped when it wasn't drying much anymore and it was close to the original weight.

Mixed these in with 1.75L of 190 proof ethanol and while what came out was 200%, the total volume was only 700 ml after I added enough pellets to fully dry it. This stuff soaked up 875ml of ethanol. The other issue was that the dust it let loose was so fine that my Buchner filter couldn’t get it clear so I had to centrifuge it clear. This stuff is worse than useless.

I didn't expect much for sieves this cheap but wow, they are extremely dusty. I tried using some immediately with some rubbing alcohol to test them, and they heated up which was a very good sign that they were working but I quickly noticed it get foggy. I didn't think much of it at first but after a few hours it was too foggy to see through. The initial batch of alcohol was effectively ruined because I have been letting it sit for over a day now without any sieves in it and it is still too cloudy to see through. I tried washing a batch of then by running water through them and stirring them gently, and this seemed to get rid of maybe 80% of the dust after close to an hour of washing. I tried putting them in a jar until it was half full and adding water and shaking it gently, and after doing this literally 10-20 times, it was only barely cloudy. I was just rolling the jar slowly and not destroying them so I don't think I was making the dust.The dust from these sieves is so fine, it passes through coffee filters like they are not even there. I was amazed because after passing over a liter of cloudy alcohol through a doubled up coffee filter, there was not even a hint of residue on it. I tried plugging a funnel with cotton and letting it slowly drip through, and even though the drop rate was only a drop every few seconds, it was still just as cloudy as it was before. I literally do not know any feasible way to remove the dust from these sieves, even with hours of washing.