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

Much better than silicon beads or other material, Work fast.

One of the main reasons I bought these was to dry was to dry my isopropanol for a capsaicin extraction and I got a very pleasant surprise when I was about to drive my isopropanol first it was exothermic meaning it generates Heat second it had some dust inside which you can see in one of the pictures once the dust settles it should be good to go besides the dust these are a great product and I would highly recommend them also there was a"sealed for your protection" pieces of paper on top but when I went to lift it off it just kind of blew away when I did it right next to my air conditioner so I'm thinking they're a little less dry than I originally thought also do not try to pour them into a small opening cuz when I tried it for my bottle they spilled everywhere but I would say these are pretty good product oh if you're trying to pull out water from a chemical then use 3A

This stuff works really well! It takes moisture out of the air super quickly and so far seems to have a fairly large capacity so it lasts a while before needing to be recharged.

Using this 3A Zeolite which arrived dry, after allowing a 148g sample to adsorb 22g moisture (more than 17% by weight) it was able to draw RH (relative humidity) down below 10% in under 15 minutes at ~75F in a sealed empty plastic cereal dispenser container. 10% is the lowest RH level my indicator is able to report. The Zeolite grains I measured were between 1.99mm and 2.45mm in diameter. 4A, 5A, and 13X Zeolite all adsorb between 1% and 3% more water vapor by weight but are all harder to regenerate and more likely to become compromised by trapping other molecules. I have determined to stick with 3A Zeolite. By comparison and after carefully drying in my microwave to reactivate: Activated Alumina Beads drew RH down to under 10% at ~75F in a few hours in an empty closed container. Silica Gel Beads drew RH down to ~10% at ~75F in a few hours in an empty closed container. They can do this to about 6% Moisture by weight. Bentonite Cat Litter drew RH down to ~26% at ~75F in a few hours in an identical container. Activated Alumina was my definite second choice, but it takes about 4 to 5 times the media volume about 3 to 5 times as long as the 3A Molecular Sieve takes to draw RH down to under 10%. Activated Alumina saturates at about 5% by weight at 10% RH whereas Molecular Sieve saturates at over 17% at the same 10% humidity. What I know so far about microwave drying: When drying my 148 dry gram test sample that had adsorbed 28 grams of moisture and was contained in a 100% cotton bag sewed with cotton thread in a 700-watt microwave oven for twenty minutes at 30% power level I was able to remove 22 grams of the adsorbed moisture successfully reactivating it to below 4% moisture by weight easily enough. I did not plan to obsess over getting it bone dry in the microwave. Small reusable Muslin drawstring Tea Bags are available for about $10 per hundred and probably can be used for more than a dozen careful microwave recharge cycles before moving the contents to a new bag. I did put my recharged Zeolite sample in a countertop air fryer for 15 minutes at 150 centigrade (302 Fahrenheit) to determine if air frying at that temperature would release any additional moisture. I was able to verify the air fryer was a viable recharging option, but I am inclined to use my $80 countertop microwave in the future. A cotton bag will degrade over time at high temperatures and anything over 150 centigrade seems too much from my perspective. Drying or recharging larger or smaller batches or using a different wattage oven will require different settings and durations to recharge without meaningful risk of damaging the media or bags.

Amazing, works miles better than the silicone pebbles. I change this every few months now instead of every couple weeks and it keeps all my filament below 10% humidity. Some people complain about the dust but that hasn't been an issue for me, they are slightly dusty but once they are inside a filter container it doesn't get my filament dusty. I don't forsee ever buying anything else. Excellent product.

They work for removing water but leave behind a bunch of dust, and if you don't want it, the best way to do that is to distill.

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.

By weight and capacity cheaper than Silica Gel, Calcium chloride, clay etc. 3A, 4A and 13X sieve is the best bang for your buck. The one downside is that to regenerate you need a clean convection oven that can get to at least 450 F or ideally 500 F. 3A (3 Angstrom) Molecular Sieve is formulated to adsorb (not absorb, there is a difference) water and ammonia and exclude larger molecules.

Werkt prima voor 3D printer filament! (In no time naar 14%).

Qualität gut

We have a dry air system that runs 24/7. I tried a less expensive 3A molecular sieve and while it worked, it didn't have the adsorption capacity to make our system work well. The Wisesorb 3A molecular sieve provided superior performance, consistently producing 2.5 ppm air without and upward creep at the end of a service cycle. Highly recommended.

These sieves are a godsend, after having to deal with counterfeit ones before it's nice to see a good product. these sieves pass the hand test, two or three balls on your hand wet with a single drop of water will sizzle and get noticably warm in your palm. regenerating them is as easy as a little ceramic crucible and a microwave on medium setting, stir every 30 seconds to a minute to vent moisture, wear gloves they get hot. Don't let them get too hot though. I got 10 re-generations out of a batch before I accidentally scorched them while working. you could possibly get more uses out of a batch, however you get a good value for your money.

Excellent product, expensive but this is overall better value, professional product which I use to repair my double glassing units.