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Views: 0 Author: Site Editor Publish Time: 2026-08-05 Origin: Site
Calcium chloride (chemical formula: CaCl₂, CAS No. 10043-52-4) is an inorganic salt composed of calcium and chlorine. At room temperature, it appears as a white crystalline solid or powder, and it is highly soluble in water. One of its defining characteristics is its strong hygroscopic (moisture-absorbing) nature — anhydrous calcium chloride can absorb several times its own weight in water from the surrounding environment.
As an ionic compound with the formula weight of 110.98 g/mol, calcium chloride is one of the most versatile industrial chemicals in use today. First documented in the 15th century and systematically studied from the 18th century onward, it has become indispensable across dozens of industries.
Property | Value (Anhydrous) | Value (Dihydrate) |
Chemical Formula | CaCl₂ | CaCl₂·2H₂O |
Molecular Weight | 110.98 g/mol | 147.01 g/mol |
Appearance | White powder/granules | White flakes/pellets |
Odor | Odorless | Odorless |
Density | 2.15 g/cm³ | 1.85 g/cm³ |
Melting Point | 772–775 °C | ~175 °C (decomposes) |
Boiling Point | 1,935 °C | — |
Water Solubility (20 °C) | 74.5 g/100 mL | ~97 g/100 mL |
pH (10% solution) | 8–9 | 8–9 |
Hygroscopicity | Extremely high | Moderate |
When calcium chloride dissolves in water, it releases a significant amount of heat (exothermic reaction). This property is what makes it so effective as a de-icing agent — the heat released helps melt ice even at very low temperatures, down to approximately −52 °C (−62 °F) for concentrated solutions.
Calcium chloride commonly exists in several hydrated forms:
Anhydrous (CaCl₂)
● — 0 water molecules; highest purity, strongest desiccant
Monohydrate (CaCl₂·H₂O)
● — 1 water molecule
Dihydrate (CaCl₂·2H₂O)
● — 2 water molecules; most common industrial form (77–80% CaCl₂)
Tetrahydrate (CaCl₂·4H₂O)
● — 4 water molecules
Hexahydrate (CaCl₂·6H₂O)
● — 6 water molecules; used in phase-change materials
The dihydrate form dominates the global market due to its cost-effectiveness and suitability for most applications. Anhydrous calcium chloride commands a premium price due to its superior purity (94–97%) and drying capability.
Calcium chloride is produced in several grades to meet different industry standards:
Grade | Typical Purity | Common Form | Primary Uses |
Industrial / Technical Grade | 74–77% (dihydrate flakes); 94% (anhydrous) | Flakes, pellets, powder, granules, liquid (30–40% solution) | De-icing, dust control, construction, oil drilling, water treatment, desiccant |
Food Grade (E509) | ≥ 77% (dihydrate); ≥ 94% (anhydrous) | Flakes, powder, granules | Cheese making, canned vegetables, beverage processing, tofu coagulation, brewing |
Pharma Grade | ≥ 96% | Powder | Not covered in this guide |
The largest single application of calcium chloride globally.
Calcium chloride is one of the most effective de-icing agents available. It works at temperatures as low as −25 °F (−32 °C), far outperforming traditional rock salt (sodium chloride), which stops working around 15 °F (−9 °C).
How it works:
1. Calcium chloride attracts moisture from the air (hygroscopic action)
2. The exothermic dissolution generates heat, melting ice on contact
3. The resulting brine solution depresses the freezing point, preventing re-freezing
Application rates:
● Anti-icing (pre-treatment): 100–200 lbs per lane mile
● De-icing (existing ice): 200–400 lbs per lane mile
● Sidewalks & parking lots: 0.25–0.5 lbs per square yard
Why it beats rock salt:
● Effective at temperatures 40+ degrees lower
● Works faster — near-instant melting
● Less total material needed
● Lower environmental impact on vegetation when used correctly
Unpaved roads, construction sites, mining operations, and industrial yards face persistent dust problems. Calcium chloride provides a proven, cost-effective solution.
How it works: Calcium chloride is hygroscopic — it continuously draws moisture from the air and binds it to road aggregate particles. This keeps road surfaces damp even in dry conditions, suppressing dust by up to 85–90% compared to untreated surfaces.
Key benefits:
● Reduces water truck usage by up to 50%
● Stabilizes road surfaces, reducing gravel loss and grading frequency
● Improves driver visibility and safety
● Extends road life by preserving fine aggregate material
Typical application:
● Liquid calcium chloride (35–38% solution) sprayed at 0.25–0.50 gallons per square yard
● Flake calcium chloride can be spread directly and watered in
● Re-application typically needed every 4–8 weeks depending on traffic and weather
Industries served: Mining, aggregate/quarry operations, construction, logging roads, rural municipalities, military training areas.
Calcium chloride is a critical component in oil and gas drilling fluids (drilling muds) and completion brines.
Key functions:
Function | How CaCl₂ Works |
Completion & workover brine | CaCl₂ brines provide precise density control (8.4–11.6 lb/gal) without suspended solids, protecting the formation from damage |
Drilling fluid additive | Controls shale swelling and hydration by providing calcium ions that stabilize clay formations |
Cement accelerator | Speeds up cement setting time in well casing operations, especially in cold environments |
Freeze protection | Keeps drilling fluids liquid at sub-zero temperatures in cold-weather operations |
The oil & gas industry primarily uses high-purity calcium chloride (94–97% anhydrous pellets or powder) to prepare clear brine fluids. The concentration of CaCl₂ determines the brine density, allowing engineers to balance formation pressure precisely.
Typical brine densities:
● 25% CaCl₂ solution: ~9.8 lb/gal
● 35% CaCl₂ solution: ~11.0 lb/gal
● 40% CaCl₂ solution: ~11.6 lb/gal
In the construction industry, calcium chloride serves as one of the most effective and economical concrete accelerators.
Primary role: Concrete set acceleration
Adding calcium chloride to concrete mixes accelerates the hydration of cement, reducing initial and final setting times. This is particularly valuable for:
● Cold-weather concreting (temperatures below 10 °C / 50 °F)
● Precast concrete production requiring fast mold turnover
● Repair work demanding quick strength development
● Reducing or eliminating the need for heated enclosures in winter pours
Performance data:
● Typical dosage: 1–2% calcium chloride by weight of cement
● Can reduce initial setting time by 30–50% at 21 °C (70 °F)
● At 4 °C (40 °F), 2% CaCl₂ can reduce setting time by up to 65%
● Increases early compressive strength (1–3 day) by 30–100%
Important limitations (per ACI 318 building code):
● Not recommended for reinforced concrete in high-moisture environments (corrosion risk for embedded steel)
● Not allowed in prestressed concrete
● Maximum chloride ion limits apply — always calculate total chloride content
● Use corrosion-inhibiting admixtures when CaCl₂ is combined with steel reinforcement
Other construction applications:
● Soil stabilization and base treatment
● Dust-proofing concrete floors
● Accelerating grout and mortar setting
● Cold-weather masonry work
Calcium chloride plays several roles in municipal and industrial water treatment:
Wastewater treatment:
● Removes fluoride, phosphates, and sulfate ions through precipitation
● Acts as a coagulant aid, improving floc formation and settling
● Adjusts water hardness for treatment process optimization
Boiler water treatment:
● Adjusts calcium-to-magnesium ratio to prevent scale formation
● Softens water through ion-exchange equilibrium
Drinking water treatment:
● Provides calcium hardness (remineralization) for desalinated or softened water
● Helps prevent pipe corrosion by maintaining Langelier Saturation Index balance
Industrial process water:
● Adjusts water chemistry for specific manufacturing processes
● Controls alkalinity and hardness levels
Anhydrous calcium chloride is one of the most powerful desiccants available commercially, capable of absorbing moisture until it literally dissolves in the water it collects (deliquescence).
Common desiccant applications:
Application | Form Used | Details |
Shipping container desiccants | Anhydrous pellets in breathable bags | Absorbs up to 300% of its weight in moisture; protects cargo from condensation damage |
Industrial dehumidifiers | Flakes or pellets in refillable containers | Used in warehouses, basements, and storage areas |
Laboratory drying tubes | Anhydrous granules | Dries gases before analysis; protects moisture-sensitive reagents |
Electronics & equipment storage | Desiccant packs | Prevents corrosion and moisture damage during storage and transport |
Natural gas drying | Granular beds | Removes water vapor from natural gas streams |
Why CaCl₂ for desiccation?
● Higher moisture absorption capacity than silica gel or molecular sieves
● Significantly lower cost per unit of water absorbed
● Visible indication of saturation (turns to liquid/brine)
● Works effectively across a wide temperature range
Calcium chloride has E number E509 and is approved as a food additive by the FDA, EFSA, and most global food safety authorities. This section covers food-grade applications only — no pharmaceutical or medical uses.
Cheese making: Calcium chloride is essential in commercial and artisanal cheese production. Pasteurization reduces the calcium content of milk, which impairs rennet coagulation. Adding food-grade CaCl₂ restores proper curd formation, resulting in:
● Faster, more consistent coagulation
● Firmer curd structure
● Higher cheese yield (up to 2–3% improvement)
● Better texture in final product
Typical dosage: 0.02–0.04% by weight of milk.
Canned vegetables & fruit processing: As a firming agent, calcium chloride helps canned vegetables (tomatoes, potatoes, cucumbers) and fruits retain their texture during thermal processing. The calcium ions cross-link with pectin in plant cell walls, strengthening the structure and preventing undesirable softening.
Beverage industry:
● Adjusts water mineral content for beer brewing (especially for Pilsner and other soft-water styles)
● Controls mineral balance in bottled water production
● Aids in the precipitation of oxalates during beer production
Tofu coagulation: In tofu and soy product manufacturing, food-grade calcium chloride serves as a coagulant, producing a firmer, calcium-enriched tofu product.
Calcium chloride is the standard chemical for raising calcium hardness in swimming pool water.
Why calcium hardness matters:
● Low calcium hardness (< 150 ppm) causes pool water to become "aggressive" — it leaches calcium from plaster, grout, and concrete surfaces, causing etching, pitting, and premature deterioration
● Ideal range: 200–400 ppm for plaster/concrete pools; 150–250 ppm for vinyl/fiberglass pools
● Proper calcium levels protect pool surfaces and equipment
How to dose:
● 2.5 oz of calcium chloride per 1,000 gallons raises calcium hardness by ~10 ppm
● Always pre-dissolve in a bucket of water before adding to the pool
● Add in the deep end with the pump running; brush any undissolved material
● Never add calcium chloride and soda ash/sodium bicarbonate on the same day — wait 24 hours
Product selection:
● Use calcium chloride dihydrate flakes (77–80%) — most cost-effective form for pool use
● Ensure the product is specifically labeled for swimming pool use
● Avoid products with additives or anti-caking agents
Calcium chloride brine (CaCl₂ solution) is widely used as a secondary refrigerant in industrial cooling systems.
Advantages of CaCl₂ brine:
● Freezing point depression to approximately −50 °C (−58 °F) at eutectic concentration (29.8% CaCl₂)
● Low cost compared to glycol-based coolants
● High heat transfer efficiency
● Non-flammable
● Suitable for food-processing cold rooms (with food-grade CaCl₂)
Typical applications:
● Ice rinks and curling facilities
● Cold storage warehouses
● Brewery fermentation temperature control
● Dairy processing plants
● Chemical process cooling
● Fish processing and freezing
Corrosion consideration: CaCl₂ brine is corrosive to carbon steel; systems require corrosion inhibitors, stainless steel components, or compatible materials. Modern formulations with inhibitor packages can achieve 15–20+ year service life.
Industry | Application |
Tire ballast | Liquid CaCl₂ fill for agricultural and construction equipment tires improves traction and stability |
Textile manufacturing | Used in dye fixation and fabric treatment processes |
Rubber manufacturing | Coagulant in natural and synthetic rubber latex production |
Plastics | Additive in PVC and polymer manufacturing |
Paper & pulp | Improves pigment retention and drainage in papermaking |
Mining & metallurgy | Flotation agent; electrolyte in magnesium production; freeze protection for coal and ore transport |
Adhesives & sealants | Component in starch-based adhesive formulations |
Phase-change materials | Calcium chloride hexahydrate (CaCl₂·6H₂O) melts at ~30 °C, storing/releasing latent heat for thermal energy storage |
Calcium chloride dihydrate (CaCl₂·2H₂O) contains approximately 22–23% water by weight. It typically comes as white flakes with 74–77% CaCl₂ content. It is the most common and cost-effective form for general industrial use.
Anhydrous calcium chloride (CaCl₂) contains minimal water (< 3%). It comes as white pellets, powder, or granules with 94–97% purity. It is more expensive but essential for applications requiring high purity or maximum drying capability, such as desiccants, drilling fluids, and chemical synthesis.
Properly sealed in its original packaging and stored in cool, dry conditions, calcium chloride has a shelf life of 12–24 months. Anhydrous products are more sensitive to moisture exposure — once opened, they should be used promptly or resealed tightly. Signs of degradation include caking, hardening, or visible moisture in the package.
At standard application rates, calcium chloride is relatively low-risk environmentally. It dissociates into calcium and chloride ions, both naturally occurring. However, concentrated applications near sensitive vegetation or waterways should be managed carefully. For road de-icing, calcium chloride is generally less damaging to roadside vegetation than sodium chloride when applied at recommended rates.
Calcium chloride is generally compatible with many common chemicals, but it reacts violently with:
● Concentrated sulfuric acid
● Bromine trifluoride
● Water-reactive metals (sodium, potassium)
When mixing de-icing products, calcium chloride blends well with sodium chloride and magnesium chloride. Always consult a compatibility chart or SDS before combining chemicals.
Food-grade (E509) calcium chloride meets strict purity standards (FCC/USP-NF), including limits on heavy metals (lead ≤ 2 ppm, arsenic ≤ 3 ppm) and other contaminants. It is suitable for food processing, beverage production, and brewing.
Industrial/technical-grade calcium chloride has broader purity tolerances and is suitable for de-icing, dust control, construction, oil drilling, and water treatment.
Never use industrial-grade CaCl₂ in food applications — the impurity profile may include substances not approved for human consumption.
A rough guideline:
Pre-treatment (anti-icing):
● 100–200 lbs per lane mile (28–56 kg per lane km)
De-icing existing ice:
● 200–400 lbs per lane mile (56–112 kg per lane km)
Sidewalks:
● 0.25–0.5 lbs per square yard (135–270 g per m²)
These rates vary based on temperature, ice thickness, and surface type. A liquid pre-treatment (30–32% CaCl₂ solution) typically uses 30–50 gallons per lane mile.
When used at recommended rates for de-icing, calcium chloride does not chemically attack concrete. However, it can contribute to surface scaling in poor-quality or non-air-entrained concrete subjected to freeze-thaw cycles. The actual mechanism is physical (freeze-thaw pressure) rather than chemical attack. Using air-entrained concrete and allowing proper curing (28+ days) before the first winter exposure minimizes any risk.
