Identification Chemical Properties Safety Data Raw materials And Preparation Products Hazard Information Material Safety Data Sheet(MSDS) Questions And Answer Spectrum Detail Well-known Reagent Company Product Information Related Products

74-83-9

Name Methyl bromide
CAS 74-83-9
EINECS(EC#) 200-813-2
Molecular Formula CH3Br
MDL Number MFCD00000166
Molecular Weight 94.94
MOL File 74-83-9.mol

Chemical Properties

Appearance Methyl bromide is a colorless gas with a chloroform-like odor at high concentrations. A liquid below 3.3C. Shipped as a liquefied compressed gas.
Melting point  −94 °C(lit.)
Boiling point  4 °C(lit.)
density  3.3 g/mL at 25 °C(lit.)
vapor density  3.3 (20 °C, vs air)
vapor pressure  1420 mm Hg ( 20 °C)
refractive index  1.4432
Fp  -34 °C
storage temp.  2-8°C
solubility  water: soluble
form  Colorless gas
Stability: Stable. Incompatible with oxidizing agents, strong acids. This is an ozone-depleting chemical, and its use is restricted in many countries.
explosive limit ~16%
Water Solubility  1.522 g/100 mL
Merck  13,6056
Henry's Law Constant 0.72 at 21 °C (Gan and Yates, 1996)
Dielectric constant 9.8(0℃)
Exposure limits NIOSH REL: IDLH 250 ppm; OSHA PEL: C 20 ppm; ACGIH TLV: TWA 5 ppm.
LogP 1.190
CAS DataBase Reference 74-83-9(CAS DataBase Reference)
IARC 3 (Vol. 41, Sup 7, 71) 1999
NIST Chemistry Reference Methyl bromide(74-83-9)
EPA Substance Registry System Methyl bromide (74-83-9)

Safety Data

Hazard Codes  T,N,Xn,F,F+
Risk Statements 
R23/25:Toxic by inhalation and if swallowed .
R36/37/38:Irritating to eyes, respiratory system and skin .
R48/20:Harmful: danger of serious damage to health by prolonged exposure through inhalation .
R50:Very Toxic to aquatic organisms.
R59:Dangerous for the ozone layer.
R68:Possible risk of irreversible effects.
R38:Irritating to the skin.
R20/22:Harmful by inhalation and if swallowed .
R11:Highly Flammable.
R67:Vapors may cause drowsiness and dizziness.
R66:Repeated exposure may cause skin dryness or cracking.
R19:May form explosive peroxides.
R12:Extremely Flammable.
Safety Statements 
S15:Keep away from heat .
S27:Take off immediately all contaminated clothing .
S36/39:Wear suitable protective clothing and eye/face protection .
S38:In case of insufficient ventilation, wear suitable respiratory equipment .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S59:Refer to manufacturer/supplier for information on recovery/recycling .
S61:Avoid release to the environment. Refer to special instructions safety data sheet .
S36/37:Wear suitable protective clothing and gloves .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S24:Avoid contact with skin .
S16:Keep away from sources of ignition-No smoking .
S7:Keep container tightly closed .
RIDADR  UN 1062 2.3
WGK Germany  3
RTECS  PA4900000
DOT Classification 2.3, Hazard Zone C (Gas poisonous by inhalation)
HazardClass  2.3
HS Code  29033990
storage Handling and storage of bromomethane cylinders must meet the specifi cations laid down by the regulatory authorities. The cylinders must undergo the required and periodic tests
storage Methyl bromide (Bromomethane) should be kept stored in sealed containers to keep it from evaporating.
Precautions Occupational workers should use appropriate ventilation during production and formulation of bromomethane at the workplace. The ventilation must be suffi cient to maintain the levels of bromomethane below the prescribed OEL. Local exhaust ventilation at source or vapor extraction may also be used. Gloves or rubber boots should not be used as the liquid or concentrated vapor may be trapped inside them
Safety Profile
Suspected carcinogen with experimental carcinogenic data. A human poison by inhalation. Human systemic effects by inhalation: anorexia, nausea or vomiting. Corrosive to skin; can produce severe burns. Human mutation data reported. A powerful fumigant gas that is one of the most toxic of the common organic hahdes. It is hemotoxic and narcotic with delayed action. The effects are cumulative and damaging to nervous system, hdneys, and lung. Central nervous system effects include blurred vision, mental confusion, numbness, tremors, and speech defects. Methyl bromide is reported to be eight times more toxic on inhalation than ethyl bromide. Moreover, because of its greater volatility, it is a much more frequent cause of poisoning. Death following acute poisoning is usually caused by its irritant effect on the lungs. In chronic poisoning, death is due to injury to the central nervous system. Fatal poisoning has always resulted from exposure to relatively high concentrations of methyl bromide vapors (from 8600 to 60,000 ppm). Nonfatal poisoning has resulted from exposure to concentrations as low as 100-500 ppm. In addtion to injury to the lung and central nervous system, the kidneys may be damaged, with development of albuminuria and, in fatal cases, cloudy swelhng and/or tubular degeneration. The liver may be enlarged. There are no characteristic blood changes. Mixtures of 10-1 5 percent with air may be ignited with difficulty. Moderately explosive when exposed to sparks or flame. Forms explosive mixtures with air within narrow limits at atmospheric pressure, with wider limits at higher pressure. The explosive sensitivity of mixtures with air may be increased by the presence of aluminum, magnesium, zinc, or their alloys. Incompatible with metals, dunethyl sulfoxide, ethylene oxide. To fight fire, use foam, water, CO2, dry chemical. When heated to decomposition it emits toxic fumes of Br-. See also BROMIDES
Hazardous Substances Data 74-83-9(Hazardous Substances Data)
Toxicity
LC for rats in air (6 hrs): 514 ppm (Irish)
IDLA 250 ppm

Hazard Information

Material Safety Data Sheet(MSDS)

Questions And Answer

Well-known Reagent Company Product Information