Frequently Asked Questions about Calcium Chloride
Dihydrate Calcium Chloride Vs. Anhydrous Calcium Chloride?
- Dihydrated calcium chloride, chemical formula CaCl2•2H20, CAS No.10035-04-8; Anhydrous calcium chloride, chemical formula CaCl2, CAS No.10043-52-4.
- Dihydrated calcium chloride contains about 20% combined crystallization water, Anhydrous calcium chloride contains no water of crystallization.
- Dihydrated calcium chloride contains pure calcium chloride from 74% to 78%. Anhydrous calcium chloride contains pure calcium chloride from 90% to 98%.
- Dihydrated calcium chloride has a molecular weight of 147.0 g/mol, while anhydrous calcium chloride has a molecular weight of 110.98 g/mol.
- Anhydrous calcium chloride is more expensive than dihydrated calcium chloride.
- Anhydrous calcium chloride as a deicing agent works more effective than dihydrated calcium chloride.
- Different application needs different calcium chloride.
How to make calcium chloride solution?
Caution: Calcium chloride releases heat when dissolved in water. Make sure the container is resistant to high temperatures. Fill the container with cool water less than +26 °C (80 °F), then slowly add calcium chloride while continuously stirring. With stirring, calcium chloride will dissolve quickly; otherwise, calcium chloride may form a hard cake at the bottom of the container and dissolve more slowly. Wear protective suits in case of splashing.
| % CaCl2 （Target） | Specific Gravity (26ºC) | Density @ 25ºC (KG/L) | Weight of Product to Dissolve | Water Volume (L) | Expected Temp. Rise (ºC) | Solution Freeze Point (ºC) |
| 26 | 1.251 | 1.247 | 38 | 87 | 34 | -35 |
| 28 | 1.275 | 1.271 | 42 | 86 | 37 | -43 |
| 30 | 1.298 | 1.294 | 46 | 84 | 40 | -47 |
| 32 | 1.322 | 1.318 | 50 | 82 | 43 | -27 |
| 34 | 1.345 | 1.341 | 54 | 81 | 44 | -12 |
| 36 | 1.369 | 1.365 | 58 | 79 | 49 | -1 |
| 38 | 1.392 | 1.388 | 62 | 77 | 48 | 9 |
| 40 | 1.416 | 1.412 | 67 | 75 | 49 | 16 |
| 42 | 1.439 | 1.435 | 71 | 73 | 48 | 21 |
Different forms of calcium chloride?
- Flake calcium chloride is made by steaming and concentrating liquid calcium chloride, cooling, crystallization, drying, and dehydrating. The process is labor-intensive, the product recovery rate is low, and the water content and impurities are high. The flake form is not conducive to packaging, or transportation. The advantages of calcium chloride flakes are that they provide a large flat surface area and stay put when applied. They can easily pass through various ice melt spreaders. Flakes are desirable when mixing with other dry products used to remove snow and ice, like salt, sand, or other abrasives. Typically, flakes are more cost-effective than pellets.
- Granular calcium chloride is close to the spherical shape, it has certain fluidity when used, and it is convenient to pack and transport. Therefore, it is widely welcomed by the market. Moreover, the market price is higher than flaked calcium chloride. In winter, the market demand is large and the supply is short. The production process of spherical calcium chloride mainly includes fluidized bed, high tower, and spray pelletizing. CaCl2 in granular form is used extensively in the pool industry as it boosts calcium hardness to prevent corrosion damage to shot and poured concrete pool surfaces. Its granular formula dissolves quickly when added directly to pool water. Granular anhydrous calcium chloride is also used as a desiccant; a drying agent and dehydrating agent. Granular calcium chloride in high-purity, the food-grade form is used in many food industries.
- Powdered calcium chloride is prepared by spray drying. Dust will easily adhere to equipment, workshops, and personnel after absorbing water, which will endanger the normal operation of equipment and the health of personnel. In addition, powdered calcium chloride is highly hygroscopic and can easily absorb moisture in the air during use, and is corrosive. Calcium chloride in powder form is typically used as an additive in other processes, including as an accelerator in concrete to decrease set times in cold weather, and as a desiccant to scavenge moisture where it will absorb so much water that it will eventually dissolve into the water it attracts.
- Pellitized calcium chloride is spherical in shape and works very well with ice melt spreaders. The pellet shape provides performance benefits as their interface with ice and snow. This form is more concentrated and allows calcium chloride down under the icy surface, creating a brine underneath. This makes easier for mechanical clearing by helping to loosen the bond of ice to the surface.
What is Calcium Chloride?
Weifang Bell Chemical is a top professional calcium chloride manufacturer and developer in China. We focus on the production and study of calcium chloride for 20 years. Email us if you need something about calcium chloride. We could be helpful.
