Hydrobromic Acid (HBr), Physical Properties, Specifications

Hydrobromic Acid (HBr)


Chemical Name: Hydrobromic Acid 48% / 52%/ 62%

Formula: HBr

CAS Number: 10035-10-6

HBr content: (%): 48-49

Molecular Weight: 80.9 g/mol

General info and Field of Use:
Hydrobromic Acid (HBr) is used as a source of Bromine in industrial syntheses.

It is a strong acid in aqueous solution, used for the preparation of catalyst in PTA/PET production, an electrolyte for energy storage, and as a hydrobromination agent in a broad range of organic processes (for Pharma and Agro applications).

Physical Properties of hydrobromic acid

Note: Physical properties are presented for hydrobromic acid 48% solution, as a

representative product. Values for other products can be found on the relevant MSDS.

  • Boiling Point 126ºC**
  • Melting Point (48%) -63ºC
  • Critical Temperature* 89.8ºC
  • Critical Pressure* 84 atm.
  • Flash Point* None
  • Auto Ignition Temperature* Not applicable
  • Decomposition Temperature* Not available
  • Molecular Weight* 80.9
  • Liquid Density 1.4882 g/ml at 20ºC
  • Vapor Density at 760 mm Hg and 25ºC (Air = 1)* 2.71
  • Latent Heat of Evaporation* 51.3 cal/g
  • Latent Heat of Fusion* 7.1 cal/g
  • Flammable Limits in Air* Not flammable
  • Solubility in Water* 194 g/100 ml at 20ºC
  • Refers to 100% Hydrogen Bromide ** As constant boiling mixture 47.63%

Typical Properties:

AppearanceClear, colorless to yellow liquid, slowly darkening on exposure to air and light.
Melting point/rangeca. -63°C
Boiling point/range126 °C (47.63%)
Evaporation rate (ether=1)Not available
Vapor pressure8 mmHg (25°C)
Vapor density1.7
Solubility: Solubility in waterFor HBr 100%:221 gr/100ml at 0°C194 g/100ml at 20°C130 gr/100ml at 100°C
Solubility in other solventsSoluble in organic solvents and acetic acid
Partition coefficient(n-octanol/water)Log Kow : 0.63-1.03 (25°C) (HBr 100%)
Explosive propertiesNot explosive
Oxidizing propertiesNot oxidizing

Specifications: Hydrobromic Acid (HBr)

HBr 48%

HBr Content %Min – 48 Max – 49
Density 20/20 C° g/mlMin 1.488
Free Bromine (Br2) ppmMax 10
Chlorides (as Cl-) ppmMax 100

HBr 52%

HBr Content %Min 52 Max 53
Density 20/20 C° g/mlMin 1.53
Color APHAMax 50
Free Bromine (Br2) ppmMax 10
Chlorides (as Cl-) ppmMax 100

HBr 62%

HBr Content %Min 62
Density 20/20 C° g/mlMin 1.705
Free Bromine (Br2) ppmMax 50
Chlorides (as Cl-) ppmMax 100

Hydrobromic acid is supplied in the following packaging:

  • Drums
  • Intermediate Bulk Containers – IBCs
  • Bulk Truck Loads

Flammability and Exclusivity:
Hydrobromic acid is non-flammable and non-explosive. At high temperatures, it will release toxic fumes of hydrogen bromide.

LD50 (inhalation rate): HBr 100% 2,858 ppm/1h. Hydrobromic acid is corrosive to the eyes, skin, and mucous membranes. Actual inhalation may produce delayed pulmonary edema. Direct contact results in serious corneal and skin burns.

Storage & Handling:
Keep containers tightly closed and protected from physical damage. Use fluorinated vinyl chloride resins or polyethylene glass-coated equipment. Avoid breathing vapors and any other bodily contact.

Some full form

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Hydrobromic Acid (HBr), Physical Properties, Specifications 1

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