Boron tribromide

  • Tribromoborane
  • Boron bromide
  • Boron(III) bromide
Formula BBr3
Description Colorless, fuming liquid with a sharp, irritating odor.
Uses Manufacture of diborane.

Registry Numbers and Inventories.
CAS 10294-33-4
EC (EINECS/ELINCS) 233-657-9
EC Index Number 005-003-00-0
EC Class Reacts violently with water; Very toxic; Corrosive
EC Risk Phrase R 14 26/28 35 40
EC Safety Phrase S 9 26 28 36/37/39 45
RTECS ED7400000
RTECS class Other
UN (DOT) 2692
Merck 13,1337
Beilstein/Gmelin 2173 (G)
Swiss Giftliste 1 G-7030
US TSCA Listed
Austrailia AICS Listed
New Zealand Listed
Japan ENCS (MITI) Listed
Korea ECL Listed

Formula BBr3
Formula mass 250.54
Melting point, C -46
Boiling point, C 91.2
Vapor pressure, mmHg 61 (25 C)
Vapor density (air=1) 8.6
Critical temperature 300
Density 2.645 g/cm3 (20 C)
Solubility in water Decomposes
Viscosity 0.731 cp (20 C)
Surface tension 29.1 g/s2
Refractive index 1.00207
Dielectric constant 4.31
Partition coefficient, pKow 3.61
Heat of fusion 3.1 kJ/mol
Heat of vaporization 31.4 kJ/mol

Hazards and Protection.
Storage Do not store in direct sunlight. Store in a tightly closed container. Keep under a nitrogen blanket. Store in a cool, dry, well-ventilated area away from incompatible substances. Poison room locked.
Handling Wash thoroughly after handling. Wash hands before eating. Use only in a well ventilated area. Avoid breathing dust, vapor, mist, or gas. Do not get in eyes, on skin, or on clothing. Keep container tightly closed. Do not ingest or inhale.
Protection Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Clean up spills immediately, using the appropriate protective equipment. Provide ventilation.
Disposal code 24
Stability Stable under normal temperatures and pressures. Reacts with water to form toxic fumes.
Incompatibilities Acids, alcohols, alkali metals, steel, and water.
Decomposition Carbon monoxide, carbon dioxide, hydrogen bromide, oxides of boron.

Flash Point,C -18
Fire fighting Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.
Fire potential Not flammable
Hazards Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.). Substance will react with water (some violently), releasing corrosive and/or toxic gases. Reaction with water may generate much heat which will increase the concentration of fumes in the air. Contact with metals may evolve flammable hydrogen gas.
Combustion products Toxic fumes of the chemical or hydrogen bromide may form in fires.
NFPA Health 3
  Flammability 0  
  Reactivity 2  
  Special W

Exposure limit(s) TLV: 1 ppm; 10 mg/m3 as CEILING (ACGIH 1993-1994). NIOSH REL: C 1 ppm (10 mg/m3)
Poison_Class 2
Exposure effects Significant ingestions or dermal exposures can be associated with weak, rapid pulse, cyanosis and abnormally low blood pressure. The patient may present with reduced body temperature, elevated body temperature or normal body temperature. Headache, lethargy, restlessness, weakness, CNS irritation, and/or seizures may occur with long term or repeated exposures. There is insufficient information concerning the reproductive effects of borates in humans. Adverse testicular effects and infertility have been reported in animals. <br>There have been limited animal studies which suggest decreased ovulation, fetotoxicity and developmental defects may occur with very high exposure levels. Maternal toxicity was present in some studies.
   Ingestion Causes gastrointestinal tract burns. Causes severe pain, nausea, vomiting, diarrhea, and shock.
   Inhalation Causes severe irritation of upper respiratory tract with coughing, burns, breathing difficulty, and possible coma. Causes chemical burns to the respiratory tract. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema.
   Skin Causes skin burns.
   Eyes Causes eye burns.

First aid
   Ingestion Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
   Skin Get medical aid. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Discard contaminated clothing in a manner which limits further exposure. Destroy contaminated shoes.
   Eyes Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).

UN number 2692
Response guide 157
Hazard class 8
Packing Group I  
HS Code 2812 90 00  
Std. Transport # 4932010