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| Calcium bromide, formula CaBr2. Chemical formula CaBr2. Molecular weight 199.90. Colorless rhombic crystals. Easy deliquescence. Melting point 730℃(with trace decomposition), boiling point 806 ~ 812℃, relative density 3.35325. The hexahydrate is a colorless hexagonal crystal with a melting point of 38.2℃, a boiling point of 149℃ and a relative density of 2.295. Soluble in water, ethanol and acetone, slightly soluble in liquid ammonia. Its aqueous solution is neutral or slightly alkaline. It is prepared by the interaction of hydrobromic acid with calcium oxide, lime milk or calcium carbonate, or by passing ammonia into lime milk and adding bromine. Should be sealed and stored away from light. It is used in the photographic industry. | |||||||||
7789-41-5
boss chem
7789-41-5
Calcium bromide (calcium dibromide; CaBr₂, CAS 7789-41-5) is a white, hygroscopic crystalline salt with the highest water solubility of the common calcium halides. In the oil and gas industry it is the key salt of high-density clear brines: its exceptional solubility (156 g per 100 g water at 25 °C, rising to about 75 wt% hot) lets operators build dense, solids-free drilling, completion, workover and packing fluids that control high wellbore pressures without formation damage. The same brine chemistry supports a second major role — injection into coal-fired power plant flue gas to oxidize elemental mercury for capture. Calcium bromide also serves in photography (dry plates and light-sensitive papers), fire-extinguishing and flame-retardant formulations, ammonium bromide manufacture, wood preservation and sizing compounds. It is supplied as anhydrous powder, hexahydrate crystals or ready-to-use clear brine
Core value propositions:
● High-Density Clear Brine Salt (Core Application): solids-free drilling, completion, workover and packing fluids for wellbore pressure control;
● Mercury Emission Control: proven flue-gas mercury oxidation aid for power generation and incineration;
● Extreme Water Solubility: up to ≈ 75 wt% in hot water — density tunable over a wide range;
Item | Specification |
Chemical Name | Calcium bromide (calcium dibromide) |
Synonyms | Calcium dibromide; hydrobromic acid calcium salt; CaBr₂ (anhydrous); CaBr₂·6H₂O (hexahydrate) |
CAS No. | 7789-41-5 |
EC No. (EINECS) | 232-164-6 |
Molecular Formula | CaBr₂ |
Molecular Weight | 199.89 g/mol |
Appearance | White hygroscopic crystalline powder or granules; odorless, deliquescent; turns yellow on extended air exposure |
Solubility | Very soluble in water (156 g/100 g water at 25 °C; ≈ 55–75 wt% from 0 °C to 100 °C); soluble in alcohol and acetone |
Assay | ≥ 97% (anhydrous, per COA); also supplied as 52–53% clear brine |
Grades | Drilling-fluid grade, industrial grade, photographic grade (customizable) |
Calcium bromide is the ionic calcium salt of hydrobromic acid. The anhydrous salt crystallizes in orthorhombic or rhombohedral form, melts at about 730–742 °C and boils near 1815 °C, with a density of about 3.38 g/cm³. It is strongly deliquescent — the crystals absorb atmospheric moisture and can dissolve into their own water of hydration — and slowly turn yellow on prolonged air exposure. Its defining property is extreme water solubility: about 156 g dissolves in 100 g of water at 25 °C and the solubility climbs with temperature to roughly 75 wt%, far exceeding the other common calcium halides. This makes aqueous calcium bromide a dense, clear liquid (typical brines reach specific gravities well above 1.7) with no suspended solids — exactly what high-pressure oilfield wellbore fluids require. It is also produced as the hexahydrate CaBr₂·6H₂O, a lower-melting hydrate form used for transport and blending.
● High-density clear brine: solids-free fluids controlling high wellbore pressures without formation damage.
● Extreme water solubility (up to ≈ 75 wt%): density tunable from light brine to heavy packing fluid.
● Mercury abatement value: converts elemental mercury to capturable oxidized forms in flue gas.
● Multi-industry: drilling, mercury control, photography, fire safety, wood preservation, chemical synthesis.
● Multi-form supply: anhydrous powder, hexahydrate, or 52–53% liquid brine.
● Stable inorganic salt: non-flammable, high thermal stability.
● Consistent quality: controlled assay (Ca and Br content), pH and clarity with COA.
The major use of calcium bromide is in high-density clear wellbore fluids:
● Drilling fluids: dense, solids-free mud for high-pressure formations.
● Completion, workover and packing fluids: clear brines protecting the wellbore and reservoir.
● Density modifier: blended with calcium chloride or zinc bromide brines to tune specific gravity.
● Formation-friendly: no suspended solids means less damage to productive zones.
An important and growing use in power generation and incineration:
● Flue-gas injection at coal-fired power plants to oxidize elemental mercury.
● Converts mercury to forms captured by existing scrubber and particulate-control equipment.
● Also applied at industrial incinerators.
A traditional bromide source for imaging materials:
● Production of photographic dry plates and light-sensitive papers.
● Bromide supply for silver-halide emulsion chemistry.
Bromide flame-retardant value in industrial fire safety:
● Component of fire-extinguishing compositions.
● Flame-retardant blends for plastics and textiles.
Additional established uses:
● Manufacture of ammonium bromide (NH₄Br) and other bromides.
● Wood preservative and sizing compounds.
● Freezing mixtures, dehydrating agent and road treatment.
● Hydraulic fluid formulations.
Packaging (customizable):
● 25 kg multi-wall paper bags with PE liner, or fiber drums (anhydrous powder/hexahydrate);
● 1,000 kg IBC totes or ISO tank for 52–53% liquid brine; small packs on request;
Storage:
● Store in a cool, dry, well-ventilated area; keep containers tightly closed.
● Protect from moisture and humidity (deliquescent salt); avoid contact with strong acids.
● Keep away from incompatible materials; prevent release to waterways.
● Factory-direct supply: own production and sourcing capability, transparent pricing, no middleman markup.
● Stable quality: strict internal control, every batch tested (assay, pH, clarity), COA with every shipment.
● Fast response: quotations and technical support (COA, SDS, application advice); small trial orders accepted.
Calcium bromide's major use is in high-density clear drilling, completion, workover and packing fluids for oil and gas wells — its extreme water solubility produces dense, solids-free brines that control wellbore pressure without formation damage. It is also injected into coal-fired power plant flue gas to control mercury emissions, and it serves in photography (dry plates, light-sensitive papers), fire-extinguishing and flame-retardant compositions, ammonium bromide manufacture, wood preservation, sizing compounds, freezing mixtures and hydraulic fluids.
Calcium bromide is classified as causing serious eye damage (GHS H318) and can also irritate skin and the respiratory tract as a dust. Handle with chemical goggles, protective gloves and dust control; in case of eye contact rinse immediately with plenty of water and seek medical attention. It is a stable, non-flammable salt, but it is strongly hygroscopic and should be kept dry and away from strong acids. Follow the SDS for full handling guidance.
Because of its extreme water solubility and high solution density. A calcium bromide brine can reach specific gravities far above 1.7 while remaining completely clear — no suspended solids. That combination is exactly what high-pressure wellbores need: the dense fluid counterbalances formation pressure, and the absence of solids avoids plugging the reservoir. It is typically blended with calcium chloride or zinc bromide to fine-tune density and crystallization temperature, and it is used for drilling, completion, workover and packing fluids alike.
Anhydrous calcium bromide (CaBr₂) is the pure salt — a white hygroscopic powder that melts near 730–742 °C — best for dry blending and custom brine preparation. The hexahydrate (CaBr₂·6H₂O) carries water of crystallization, melts much lower (around 38 °C) and is easier to handle in humid climates. The 52–53% liquid brine is the ready-to-use field form, shipped in totes or tanks and directly pumpable into the well — the practical choice when logistics allow. Choose by application: powder/hexahydrate for formulation flexibility, brine for direct use.
