What is a silica gel desiccant?

Silica gel desiccant is a highly active adsorption material, which is usually prepared by reacting sodium silicate and sulfuric acid, and undergoing a series of post-treatment processes such as aging and acid soaking. Silica gel is an amorphous substance, and its chemical formula is mSiO2. nH2O. Insoluble in water and any solvent, non-toxic and tasteless, stable in chemical properties, and does not react with any substance except strong alkali and hydrofluoric acid. The chemical composition and physical structure of silica gel determine that it has many characteristics that other similar materials cannot replace. Silica gel desiccant has high adsorption performance, good thermal stability, stable chemical properties, and high mechanical strength.

Silica gel desiccant is a variety of silica gel packed in moisture-permeable small bags. The main raw material silica gel is a kind of hydrous silica with high microporous structure. It is non-toxic, tasteless, odorless, stable in chemical properties, and has strong hygroscopicity. A highly active adsorbent material. It is usually prepared by reacting sodium silicate and sulfuric acid, and undergoing a series of post-treatment processes such as aging and acid soaking. Silica gel is an amorphous substance, its shape is transparent and irregular sphere, and its chemical formula is mSiO2·nH2O. Therefore, it is widely used in the storage and transportation of instruments, meters, equipment, leather, luggage, footwear, textiles, food, medicine, etc. to control the relative humidity of the environment, reduce and slow down the damp, mildew and rust of items.

Silica gel desiccant is a kind of water-absorbing substance, which is usually used to prevent products from being damaged due to excessive humidity. Silica is the basic ingredient in silica gel desiccants, but some types also contain chemicals that change color depending on how much water is absorbed. Silicone is typically supplied in sachets, but is sometimes applied in bulk.

Silica gel desiccants are usually in the form of granules or beads. These pellets can be placed in bags made of breathable material. What size bag to use depends on the volume of air to be dried, and manufacturers will often seal it in a plastic bag to keep it out from outside moisture. Silica absorbs water much better than desiccants made from clay.

Some silica gel desiccants also have an indicating property, a chemical that shows changes in humidity. The gel particles will turn different colors according to how much water they contain. Some indicator chemicals are orange when the silica dries, then turn green when wet. Other types change from orange to white. If it is blue silica, it will turn pink when saturated.

The advantage of silica gel desiccant is that the bulk particles can be reused. Oven or microwave heating releases moisture from the silica. After the silica dries, it can be used again as before. Desiccants containing indicators can also change back to their original color.

Most silicones are not harmful if ingested. Any product has the potential to be damaged by moisture, from shoes to electronics, so they often include bags of silica gel desiccant. In addition, drying processes such as seed preservation may also involve silica gel desiccants.

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