--- product_id: 201413371 title: "Wisesorb 7 LBS 3A Molecular Sieve, Premium Quality Desiccant Bulk Material" price: "£72.29" currency: GBP in_stock: true reviews_count: 13 url: https://www.desertcart.co.uk/products/201413371-wisesorb-7-lbs-3a-molecular-sieve-premium-quality-desiccant-bulk store_origin: GB region: United Kingdom --- # Rapid moisture absorption even at low humidity Reactivates at 550°C for reuse 0.3nm pore size precision Wisesorb 7 LBS 3A Molecular Sieve, Premium Quality Desiccant Bulk Material **Price:** £72.29 **Availability:** ✅ In Stock ## Summary > 💧 Stay dry, stay ahead — the ultimate moisture control for pros. ## Quick Answers - **What is this?** Wisesorb 7 LBS 3A Molecular Sieve, Premium Quality Desiccant Bulk Material - **How much does it cost?** £72.29 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/201413371-wisesorb-7-lbs-3a-molecular-sieve-premium-quality-desiccant-bulk) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Effortless Reactivation:** Simply bake at 550°C for 2 hours to restore full moisture absorption capacity and reduce waste. - • **Superior Moisture Control:** Keeps humidity below 15%, outperforming silica gel by 3x in low-humidity environments—perfect for precision moisture-sensitive setups. - • **Industrial-Grade Durability:** Strong anti-crash and anti-pollution properties extend lifespan and maintain peak performance. - • **Versatile Application Spectrum:** Perfect for drying air, gases, refrigerants, and hydrocarbons—ideal for advanced industrial and 3D printing needs. - • **Precision Pore Size for Targeted Drying:** 0.3nm pores selectively absorb moisture, not larger molecules, ensuring ultra-efficient drying. ## Overview Wisesorb 7 LBS 3A Molecular Sieve is a premium aluminosilicate desiccant with a precise 0.3nm pore size, engineered for rapid and selective moisture absorption. It boasts industrial-grade durability, is reusable after high-temperature reactivation, and excels in maintaining ultra-low humidity levels, making it the go-to choice for professional-grade drying applications including 3D printing, gas drying, and refrigeration. ## Description Wisesorb 7 LBS 3A Molecular Sieve, Premium Quality Desiccant Bulk Material: desertcart.com: Industrial & Scientific Review: Better filament dehumidification than Silica Gel Beads or Bentonite. Far Better. - 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. Review: Outstanding product and at a good price. - Best thing ever created if you want to test if they still got absorbtion in them put it in your hand wet ur finger and touch them if they get hot they are still good but be careful I squeezed them and it almost burned my finger. They are great for dehydrating mushrooms after the dehydrator this bad boys will pull that little moisture left for the longest shelf life possible ## Features - 【3A Molecular Sieve】: 3A molecular sieve desiccant is a type of compound aluminosilicate desiccant whose effective pore size is 0.3nm. It is mainly used to absorb water and does not absorb and molecular larger than 0.3nm. Its application characteristics in industrial use are: rapid absorption seed, a mass of reusable times, strong anti-crash strength, and strong anti-pollution ability, which improves the use effectiveness of molecular sieve and extends its service life. - 【Complies with Industry Standard, Strict Quality Control】: Wisesorb 3A molecular sieve desiccant goes through strict quality control process before they are released from the factory. It complies with molecular sieve industry standard and ensure that every bottle if product are qualified and has premium quality. - 【Wide Range of Use】: Pore size of 3A molecular sieve is 3A, which is applicable for drying of all types air, hollow glass, refrigerating fluid, natural gas, methane, unsaturated hydrocarbon, pyrolysis gas, ethylene, acetylene, propylene, butadiene, etc. - 【Rapid Moisture Absorption, Reusable】: Wisesorb 3A molecular sieve has strong moisture absorption ability even under low temperature and low humidity rate. At the time, it still possesses certain moisture absorption under high temperature . It can be reactivated when dried under 550°C - 【How to Reactivate】: The 3A molecular sieve can be placed in a muffle furnace and baked at 550°C (1020℉) for 2 hours, then transferred to a drying cylinder, and cooled to room temperature for use. ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 4.6 out of 5 stars 290 Reviews | ## Images ![Wisesorb 7 LBS 3A Molecular Sieve, Premium Quality Desiccant Bulk Material - Image 1](https://m.media-amazon.com/images/I/716IY-6gXGL.jpg) ![Wisesorb 7 LBS 3A Molecular Sieve, Premium Quality Desiccant Bulk Material - Image 2](https://m.media-amazon.com/images/I/81JXFRgxJ+L.jpg) ![Wisesorb 7 LBS 3A Molecular Sieve, Premium Quality Desiccant Bulk Material - Image 3](https://m.media-amazon.com/images/I/71+LNMAYjlL.jpg) ![Wisesorb 7 LBS 3A Molecular Sieve, Premium Quality Desiccant Bulk Material - Image 4](https://m.media-amazon.com/images/I/81JIEf+APkL.jpg) ![Wisesorb 7 LBS 3A Molecular Sieve, Premium Quality Desiccant Bulk Material - Image 5](https://m.media-amazon.com/images/I/71pJdAGEWuL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Do these come fairly dust free or could they be run through a Buchner vacuum w/ cheesecloth to clean?** A: Mine was completely dust-free. I dumped them directly from the container to a muslin bag for my safe. **Q: Are the 3A molecular sleeves actually 3A size and are they clean (price seems too good)?** A: yes **Q: Is the regeneration temperature really 550°c? other sources that i can find all list 300c (550f) or 315c (599f) as the maximum temperature to use.** A: Hi, Thank you for your question. The reactivation temperature for our product, 3A Molecular Sieve, is 550°C. **Q: How many times can you reactivate 3A Molecular Sieve?** A: 【How to Reactivate】: The 3A molecular sieve can be placed in a muffle furnace and backed at 550°C (1020℉) for 2 hours, then transferred to a drying cylinder, and cooled to room temperature for use. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Better filament dehumidification than Silica Gel Beads or Bentonite. Far Better. *by R***R on March 18, 2026* 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. ### ⭐⭐⭐⭐⭐ Outstanding product and at a good price. *by A***L on June 20, 2026* Best thing ever created if you want to test if they still got absorbtion in them put it in your hand wet ur finger and touch them if they get hot they are still good but be careful I squeezed them and it almost burned my finger. They are great for dehydrating mushrooms after the dehydrator this bad boys will pull that little moisture left for the longest shelf life possible ### ⭐⭐⭐⭐⭐ This should be the standard for 3d printing, not silica *by N***4 on June 9, 2026* This stuff is great, it works very well. People should use this over silica for 3d printing. It keeps my 3d printer AMS at <10%. **I tested and found it much easier to use - to recharge it at 200C for just 3 hours.** The directions say you need 550C for 2 hours. To get that hot requires some specialized lab equipment. Again, I found that unnecessary. The important thing about Mole Sieve is that it does most of its moisture absorption before you hit 15% vs Silica. Silica can hold more water but only if you're looking to limit the humitity at higher RH. So if your goal is to keep your dry box or enclosure at 50% RH or less then silica is better. I try to keep things more like 15% or less and mole sieve is 3x more effective in this range. Or conversely, I'd need 300g of silica to do the same thing that 100g of mole sieve does. It makes changing desiccant out simpler too. If you start hitting 10%, just swap it out, its done all its work already and needs to be recharged. ## Frequently Bought Together - Wisesorb 7 LBS 3A Molecular Sieve, Premium Quality Desiccant Bulk Material - Wisesorb 20 Packs Breathable Paper Bags, Zip Lock Storage Bags for Small Items, Silica Gel Beads, Desiccant, Jewelry, Samples, 4.3 by 6.3 Inch - Wisesorb 7.5 LBS 4A Molecular Sieve, Premium Quality Desiccant Bulk Material --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/201413371-wisesorb-7-lbs-3a-molecular-sieve-premium-quality-desiccant-bulk](https://www.desertcart.co.uk/products/201413371-wisesorb-7-lbs-3a-molecular-sieve-premium-quality-desiccant-bulk) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-08-26*