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In order to protect clothes, bedding and other items from being infested by mold, many people hang dehumidification bags or put dehumidification boxes in their closets.As long as the air is humid enough, it won't take long before the bottom of these dehumidification products will produce a large bag of "stagnant water", and the effect is clearly visible.However, are these liquids really water?Have you ever wondered how they are produced?What is the liquid in the dehumidification bag?| E-commerce platform screenshotWhat is the principle of dehumidification bag?Almost all dehumidification boxes and dehumidification bags use the same active ingredient: anhydrous calcium chloride granules.The moisture absorption capacity of this substance is much stronger than other desiccants such as silica gel beads.Most of the active ingredients in such hygroscopic products are anhydrous calcium chloride | E-commerce platform screenshotCalcium chloride will continuously absorb moisture from the humid air and dissolve in the water.After a solution is formed, it continues to absorb moisture until the vapor pressure of the solution and the air are in equilibrium.The "water" we see in the dehumidification box is actually the calcium chloride solution formed after absorbing moisture.How much water a dehumidification box can absorb and how concentrated the resulting solution is depends on environmental conditions.The greater the humidity of the air, the more moisture the calcium chloride can absorb, and the lower the concentration of the solution formed at final equilibrium.In an environment of 25掳C and 90% relative humidity, calcium chloride particles can absorb more than 6 times their own weight in water.When equilibrium is finally reached, it forms a calcium chloride solution with a concentration of approximately 10%.Although this is an extremely strong water absorption capacity, its dehumidification effect is still limited compared to a dehumidifier in very humid or larger spaces.Packaging also has mysteriesThe working principle of the dehumidification bag is very simple, but it does not mean just finding a plastic bag, pouring calcium chloride into it and then done.In terms of packaging and auxiliary materials, this type of product also has some mysteries.DuPont paper is often used in the packaging of dehumidification bags and dehumidification boxes - it is not actually paper, but a special chemical fiber non-woven fabric made of interwoven high-density polyethylene filaments.DuPont paper is often used in dehumidification bag packaging | Photographed by the authorDuPont paper has many small pores between fibers, which allow water vapor to pass freely.Therefore, the calcium chloride particles that appear to be sealed in the packaging can still absorb moisture from the air.DuPont paper under the microscope | MIT Filter Media DatabaseOn the other hand, DuPont paper is a fairly hydrophobic material.It won't get soaked by water and won't allow liquid water to penetrate easily.Therefore, as long as the packaging is intact, the solution formed by moisture absorption will not leak out and contaminate the wardrobe.Small packets of desiccant are also often packaged in DuPont paper packaging.When water drips on the surface, you can see that the package will not get soaked | Photographed by the authorIn addition to DuPont paper, some moisture-absorbent bags also add additional anti-leakage insurance: "water locking agent".The white powdery "water-locking agent" will turn the solution in the bag into gel, so you don't have to worry about leakage even if the package is damaged.The ingredient of these "water-locking agents" is usually modified starch, which can dissolve in water to form a viscous solution.Next, calcium ions will act as a cross-linking agent, turning the starch solution into a uniform gel.What happens if you accidentally take a sip?The "water" in the hygroscopic bag is not real water, and it is naturally not drinkable - but what will be the consequences if someone is curious and takes a sip or a child accidentally takes a sip?Calcium chloride is a very safe and low-toxic substance. Ingesting a small amount of its solution will not cause obvious problems.Although ingesting large amounts can affect blood calcium levels, it is uncommon for calcium chloride solutions to cause illness due to their unpleasant bitter taste.However, anhydrous calcium chloride particles before absorbing water are more dangerous.Although not toxic, these particles are irritating to the skin, eyes and digestive tract, and can cause gastrointestinal burns if ingested.This is because when calcium chloride particles encounter moisture on the surface of the human body, they will quickly absorb moisture and dissolve, and at the same time release a large amount of heat.Calcium chloride particles before absorbing moisture are more dangerous than the solution | Photo by the authorSome hygroscopic products will provide bulk calcium chloride particles for users to replenish themselves. When using these particles, special attention should be paid to children and pets to avoid accidental ingestion.References[1]https://www.dupont.com/tyvekdesign/design-with-tyvek/why-tyvek.html[2]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7447462/[3]Calcium Chloride Handbook, DowChemicals.Planning and production