Calcium chloride is highly effective, and one of the most hygroscopic materials, when it comes to absorbing moisture from the surrounding air.
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Calcium chloride is an inorganic compound – a salt with the chemical formula CaCl2. It is white flakes or pellets at room temperature, and is highly soluble in water. Calcium chloride desiccants work well over a temperature range from freezing point up to 80 °C or more. Calcium chloride is the active compound in all Absortech products.
Calcium chloride is often used for de-icing or dust control on gravel roads, in food or as the absorbing agent in desiccants. In much of the world, calcium chloride is derived from limestone as a by-product of the Solvay process. Calcium chloride can also be obtained from brine purification.
Calcium chloride is not hazardous to the environment but classified as H319 according to GHS (causes serious eye irritation).
Calcium chloride is available in different concentrations and is often specified as 74-77% or 94-97% depending on the purity level. The higher the concentration, the better the absorption capacity. Meaning a desiccant with 94-97% CaCl2 has the ability to absorb more moisture than 74-77% CaCl2.
Absortech uses calcium chloride as the absorbing agent in our desiccants due to its high efficiency compared to other types of desiccants, such as silica gel and clay desiccants.
Calcium chloride (CaCl2) absorbs moisture from the air effectively. It can attract several times its own weight in water, dissolving into a liquid brine if the air is humid enough and the temperature is high enough. The liquid brine is either trapped inside a collector or mixed with a modified starch and thereby formed as a gel inside its packaging.
Calcium chloride desiccant absorbs more moisture when the relative humidity (RH) of the surrounding air is higher. And its absorption increases exponentially as RH rises, which is a remarkable result compared to other desiccants like silica gel and clay.
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Other desiccants may include toxic substances. For example, silica gel with indicators, can include the toxic substance cobalt. Whereas calcium chloride is a naturally occurring substance classified as non-hazardous to the environment.
But the main advantage of using calcium chloride desiccants compared to other types of desiccants is, of course, that these desiccants are much more efficient and thereby the amount and weight of desiccants used for the same protection is much lower.
By choosing the most efficient desiccants, companies can reduce material consumption, minimize waste, and lower transport-related emissions. These improvements contribute directly to lowering greenhouse gas (GHG) emissions, particularly CO₂—an essential step toward more sustainable logistics and one of th emost important challenges that we have for the future.
Food Grade Anhydrous 94-97% Calcium Chloride Pellets are white, free-flowing pellets that are manufactured according to the U.S. Food and Drug Administration’s (FDA’s) current Good Manufacturing Practice (cGMP) requirements. This product will meet the Food Chemicals Codex (FCC) monograph for anhydrous calcium chloride. This product is Kosher certified and Halal Compliant. A Certificate of Analysis (COA) is provided for every product shipment.
To create a solution by mixing this product with water, refer to our Making Solutions Calculator.
Store in a dry area, and tightly reseal after each use. To maintain product quality while in storage, solid calcium chloride must be protected from moisture. If the product is on a pallet covered by an intact plastic shroud, it can be stored outdoors on a well-drained surface. If the shroud is torn, pierced, or removed, then the palletized product should be stored indoors or under a waterproof covering.
When properly stored to protect from moisture contact, the expected shelf life for all calcium chloride packaged products is 36 months from the date of manufacture. Calcium chloride does not degrade or deteriorate; however, the shelf life is limited based on the potential for moisture intrusion into the product. Moisture will cause a decrease in overall calcium chloride assay and may cause product clumping. Solid calcium chloride absorbs moisture from the air (i.e., is hygroscopic), even to the point of converting to liquid brine (i.e., is deliquescent).
For more detailed information see our Calcium Chloride Handbook.
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