What is a desiccant?

A desiccant is a product or material that can be absorbs moisture from the air, thus reducing the humidity in a controlled environment and thereby protecting goods from moisture damage

Desiccant absorption characteristics

Physical absorption

Such desiccants absorb moisture physically by trapping the moisture inside its capillaries or its surface, yet the water molecules chemical properties remain unchanged, thus the moisture absorption process is reversible.
Typical physical absorption desiccants: silica gel, molecular sieve, etc.

Chemical absorption

Such desiccants absorb moisture and convert the resultant mixture to another substance by changing its chemical properties a process that is irreversible.
Typical chemical absorption desiccant: calcium chloride, magnesium sulfate, etc.

The quantity of comparison of deciccant used

The most common dessicants is use are silica gel and clay which only absorb from 10% to 27% of their dry weight, whereas Super Dry desiccant absorbs up to 300%.

The absorption rate of Super Dry desiccant is 8 times up to 15 times than the common desiccants.

For example, inside a hermetically seeled box of 1 cubic meter at 30°C and 80% RH, there are 24 grams of moisture. To absorb all the moisture inside the box, about 100 grams of high quality common desiccant are required but only about 10 grams of Super Dry desiccant are required. Furthermore this makes Super Dry extreamly cost efficient verses other type of desiccant.


Four common desiccant raw material ingredients and their main characterstics

Desiccant Description Features Absorption rate Application TEMP
Calcium Chloride Desiccant High purity CaCl2 as its main absorption agent Chemical absorption, nontoxic and odorless; High moisture absorption ability up to 700% -5°C — 90°C
Silica Gel SiO2 as the main ingredient, transparent and semi-transparent solid spheres Physical absorption with mild reaction; Chemically stabe, relatively high mechanical strength; Granules with dry surface and no significant change in appearance after use; Reusable after oven drying. 10% —27% below 35°C
Clay Also called montmorillonite desiccant, in powder or ball form Additive-free, non-toxic, environmentally friendly 15% —23% below 50°C
Molecular Sleve Crystalline aluminosilicate with homogeneous aperture and realatively large surface areas and selectively absorption Recyclable, non-toxic, non-corrosive, chemically stable; Sensitive to environmental humidity, absorbs moisture even under ultralow humidity 10% — 25% can be used at high temperature




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