Bromochloromethane

  • Methylene chlorobromide
  • Halon 1011
  • CB
  • CBM
Formula
CH2BrCl
Structure
Description
A clear colorless liquid with a sweet chloroform-like odor.
Uses
Fire-extinguishing fluid (its effectiveness per unit weight makes it suitable for use in aircraft and portable extinguishers), explosive suppression agent, and intermediate and solvent in the manufacture of pesticides and other products.

Registry Numbers and Inventories.
CAS
74-97-5
EC (EINECS/ELINCS)
200-826-3
S 23 24/25
RTECS
PA5250000
RTECS class
Drug; Mutagen
UN (DOT)
1887
Beilstein/Gmelin
1730801
Beilstein Reference
4-01-00-00074
Swiss Giftliste 1
G-1396
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CH2BrCl
Formula mass
129.39
Melting point, °C
-83
Boiling point, °C
68 - 69
Vapor pressure, mmHg
147 (25 C)
Vapor density (air=1)
4.46
Critical temperature
284
Critical pressure
63.85
Density
1.9 g/cm3 (15 C)
Solubility in water
Slightly soluble
Viscosity
0.670 mn.s/sq m (20 C)
Surface tension
33.32 g/s2 (20 C)
Refractive index
1.483
Partition coefficient, pKow
1.41
Heat of vaporization
30.0 kJ/mol

Hazards and Protection.
Storage
Do not store in direct sunlight. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Store protected from light.
Handling
Wash thoroughly after handling. Wash hands before eating. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation. Store protected from light. Corrosive to some forms of plastics, rubbers, and coatings.
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
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Provide ventilation.
Stability
Stable under normal temperatures and pressures. May discolor on exposure to light. Light sensitive.
Incompatibilities
Strong oxidizing agents, strong bases, magnesium, zinc, calcium, powdered aluminum.
Decomposition
Hydrogen chloride, phosgene, carbon monoxide, carbon dioxide, hydrogen bromide.

Fire.
Flash Point,°C
-23
Upper exp. limit, %
22.6
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Water runoff can cause environmental damage. Dike and collect water used to fight fire. Material will not burn. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Water may be ineffective. Material is lighter than water and a fire may be spread by the use of water. Extinguishing media: Substance is noncombustible; use agent most appropriate to extinguish surrounding fire. For small fires, use dry chemical, carbon dioxide, or water spray. For large fires, use dry chemical, carbon dioxide, alcohol-resistant foam, or water spray.
Fire potential
May burn but does not ignite readily.
Hazards
Most vapors are heavier than air. Air/vapor mixtures may explode when ignited. Container may explode in heat of fire.
Combustion products
Decomposition products (hydrogen chloride, hydrogen bromide and bromine gases) are evolved by contact with fire.
Health
1
 
Flammability
1
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV: 200 ppm; 1060 mg/m3 (ACGIH 1994-1995). OSHA PEL: TWA 200 ppm (1050 mg/m3) NIOSH REL: TWA 200 ppm (1050 mg/m3) NIOSH IDLH: 2000 ppm
Poison_Class
4
Exposure effects
May cause liver and kidney damage. Prolonged exposure may produce a narcotic effect. Laboratory experiments have resulted in mutagenic effects.
   Ingestion
Causes gastrointestinal irritation with nausea, vomiting and diarrhea. May cause liver and kidney damage. May cause central nervous system depression.
   Inhalation
Causes respiratory tract irritation. May cause chemical bronchitis with coughing and difficulty in breathing. Vapors may cause dizziness or suffocation.
   Skin
Causes skin irritation. May cause dermatitis.
   Eyes
Causes eye irritation. May cause eye injury.

First aid
 
   Ingestion
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.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   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.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
1887
Response guide
Hazard class
6.1
Packing Group
III
 
USCG CHRIS Code
BCM
 
36 Halogenated hydrocarbons
Std. Transport #
4925178
 
IMO Chemical Code
17
IMO Pollution Category
D
IMO Hazard code
S