Dibromomethane

  • Methylene bromide
  • Methylene dibromide
Formula
CH2Br2
Structure
Description
Clear, colorless liquid.
Uses
Organic synthesis, solvent.

Registry Numbers and Inventories.
CAS
74-95-3
EC (EINECS/ELINCS)
200-824-2
EC Index Number
602-003-00-8
EC Class
Harmful; Dangerous for the Environment
R 20 52/53
RTECS
PA7350000
RTECS class
Mutagen
UN (DOT)
2664
Merck
12,6138
Beilstein/Gmelin
969143
Beilstein Reference
4-01-00-00078
RCRA
U068
Swiss Giftliste 1
G-6888
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CH2Br2
Formula mass
173.85
Melting point, °C
-53
Boiling point, °C
97
Vapor pressure, mmHg
45 (25 C)
Vapor density (air=1)
6.05
Saturation Concentration
63000 ppm at 25 C (calc)
Critical temperature
310
Critical pressure
68.39
Density
2.4970 g/cm3 (20 C)
Solubility in water
1.193 g / 100 ml
Viscosity
1.23 cp (25 C)
Surface tension
30.88 g/s2 (80 C)
Refractive index
1.5395 (15 C)
Partition coefficient, pKow
1.70
Heat of vaporization
30.0 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry place. Keep container closed when not in use.
D1B
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. Avoid contact with skin and eyes. Avoid ingestion and inhalation. 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. Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Remove all sources of ignition. Provide ventilation.
Disposal code
2
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents, aluminum, and magnesium. Mixtures with potassium explode upon light impact.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide, hydrogen bromide.

Fire.
Flash Point,°C
34
Upper exp. limit, %
27.2
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. Use water spray to keep fire-exposed containers cool. Containers may explode in the heat of a fire. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
Probably inflammable.
Hazards
Air/vapor mixtures may explode when ignited. Container may explode in heat of fire.
Combustion products
Dissociation products generated in a fire may be irritating or toxic.
Health
2
 
Flammability
1
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
May cause liver and kidney damage. Prolonged exposure may produce a narcotic effect.
   Ingestion
Harmful if swallowed. Causes gastrointestinal irritation with nausea, vomiting and diarrhea.
   Inhalation
Causes respiratory tract irritation. May cause severe irritation of the respiratory tract with sore throat, coughing, shortness of breath and delayed lung edema.
   Skin
Causes skin irritation. Prolonged and/or repeated contact may cause irritation and/or dermatitis.
   Eyes
Causes eye irritation.

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 not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   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 immediately.

Transport.
UN number
2664
Response guide
Hazard class
6.1
Packing Group
III
 
USCG CHRIS Code
DBH
 
36 Halogenated hydrocarbons
HS Code
2903 30 35
 
Std. Transport #
4925130
 
IMO Chemical Code
17
IMO Pollution Category
C
IMO Hazard code
S/P