Bromomethane , 99% , 74-83-9
Synonym(s):
Methyl bromide
CAS NO.：74-83-9
Empirical Formula: CH3Br
Molecular Weight: 94.94
MDL number: MFCD00000166
EINECS: 200-813-2
PRODUCT Properties
| Melting point: | −94 °C(lit.) |
| Boiling point: | 4 °C(lit.) |
| Density | 1.7 g/cm3 |
| vapor density | 3.3 (20 °C, vs air) |
| vapor pressure | 1420 mm Hg ( 20 °C) |
| refractive index | 1.4432 |
| Flash point: | -34 °C |
| storage temp. | 2-8°C |
| solubility | water: soluble |
| form | Colorless gas |
| 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. |
| Stability: | Stable. Incompatible with oxidizing agents, strong acids. This is an ozone-depleting chemical, and its use is restricted in many countries. |
| LogP | 1.190 |
Description and Uses
Methyl bromide is a colorless liquid or gas with
practically no odor. It is a poisonous gas at
room temperature and atmospheric pressure. At
high concentrations, it has a chloroform-like
odor. Detection of lower concentrations is often
facilitated by a warning odorant, chloropicrin,
which is added by the manufacturer.
Methyl bromide is flammable only in the
range of 10 percent to 16 percent by volume in
air. Its physical properties do not meet the definition
of a flammable gas as defined by DOT
and TC. The onset of thermal decomposition
occurs at approximately 752°F (400°C).
Methyl bromide is used as a fumigant forpest control, for degreasing wool, and as a methylating agent. Its use as a refrigerant andin fire extinguishers is restrained because ofits health hazards.
Safety
| Symbol(GHS) |      GHS06,GHS08,GHS09,GHS02,GHS07 |
| Signal word | Danger |
| Hazard statements | H225-H301+H311+H331-H370-H302+H332-H315-H319-H335-H336-H341-H373-H400-H420-H280-H301+H331 |
| Precautionary statements | P210-P280-P302+P352+P312-P304+P340+P312-P370+P378-P403+P235-P261-P273-P281-P305+P351+P338-P301+P310-P311 |
| Hazard Codes | T,N,Xn,F,F+ |
| Risk Statements | 23/25-36/37/38-48/20-50-59-68-38-20/22-11-67-66-19-12-39/23/24/25-23/24/25 |
| Safety Statements | 15-27-36/39-38-45-59-61-36/37-26-24-16-7 |
| 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 |
| Toxicity | LC for rats in air (6 hrs): 514 ppm (Irish) |
| IDLA | 250 ppm |
