CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Methyl bromide appears as colorless highly toxic volatile liquid or a gas. Boiling point 3.56 °C (38.41 °F). Usually odorless, but has a sweetish chloroform-like odor at high concentrations. Used as an insecticide, a rodenticide, a fumigant, a nematocide, a chemical intermediate and as a fire extinguishing agent. (EPA, 1998) |
|---|---|
| Color/Form | Colorless, transparent, easily liquified gas or volatile liquid |
| Odor | Usually odorless; sweetish, chloroform-like odor at high concentrations |
| Taste | Burning taste |
| Boiling Point | 38.4 °F at 760 mmHg (EPA, 1998) |
| Melting Point | -136 °F (EPA, 1998) |
| Flash Point | None (EPA, 1998) |
| Solubility | 2 % (NIOSH, 2023) |
| Density | 1.73 at 32 °F (EPA, 1998) - Denser than water; will sink |
| Vapor Density | 3.27 (EPA, 1998) - Heavier than air; will sink (Relative to Air) |
| Vapor Pressure | 1420 mmHg at 68 °F (EPA, 1998) |
| LogP | log Kow = 1.19 |
| Henry's Law Constant | Henry's Law constant = 7.34X10-3 atm-cu m/mole at 25 °C |
| Stability/Shelf Life | Stable under recommended storage conditions. |
| Autoignition Temperature | 999 °F (USCG, 1999) |
| Decomposition | Hazardous decomposition products formed under fire conditions. - Carbon oxides, Hydrogen bromide gas. |
| Viscosity | 0.397 cP at 0 °C |
| Corrosivity | Corrosive to aluminum, magnesium & their alloys |
| Heat of Combustion | -787.0 kJ/mol |
| Heat of Vaporization | 23.26 kJ/mol at 25 °C |
| Surface Tension | 24.5 dynes/cm = 0.0245 N/m at 15 °C |
| Ionization Potential | 10.54 eV |
| Odor Threshold | Odor Threshold Low: 20.0 [ppm] Odor Threshold High: 1000.0 [ppm] Odor thresholds from CHEMINFO |
| Refractive Index | Index of refraction: 1.4218 at 20 °C/D |
| Relative Evaporation Rate | Greater than 1 (butyl acetate= 1) |
| Kovats Retention Index | 402.4 421 410.1 414 415 414 419.9 420 |
| Other Experimental Properties | Conversion factors: 1 mg/L = 257 ppm; 1 ppm = 3.89 mg/cu m at 25 °C, 760 Torr |
| Chemical Classes | Pesticides -> Fumigants |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Flame Flammables GHS02  Skull and Crossbones Acute Toxicity GHS06  Exclamation Mark Irritant GHS07  Health Hazard GHS08  Environment GHS09 |
| GHS Hazard Statements |
H225:Flammable liquids H280:Gases under pressure H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation H336:Specific target organ toxicity,single exposure; Narcotic effects H341:Germ cell mutagenicity H370:Specific target organ toxicity, single exposure H373:Specific target organ toxicity, repeated exposure H400:Hazardous to the aquatic environment, acute hazard H420:Hazardous to the ozone layer |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P273:Avoid release to the environment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P281:Use personal protective equipment as required. P311:Call a POISON CENTER or doctor/physician. P301+P310:IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P370+P378:In case of fire: Use … for extinction. P403+P235:Store in a well-ventilated place. Keep cool. |
COMPUTED DESCRIPTORS
| Molecular Weight | 94.94 g/mol |
|---|---|
| XLogP3 | 1 |
| Hydrogen Bond Donor Count | 0 |
| Hydrogen Bond Acceptor Count | 0 |
| Rotatable Bond Count | 0 |
| Exact Mass | 93.94181 g/mol |
| Monoisotopic Mass | 93.94181 g/mol |
| Topological Polar Surface Area | 0 Ų |
| Heavy Atom Count | 2 |
| Formal Charge | 0 |
| Complexity | 2 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Bromomethane is a manufactured chemical. It also occurs naturally in small amounts in the ocean where it is formed, probably by algae and kelp. It is a colorless, nonflammable gas with no distinct smell. Other names for bromomethane are methyl bromide, mono-bromomethane, and methyl fume. Trade names include Embafume and Terabol. Bromomethane is used to kill a variety of pests including rats, insects, and fungi. It is also used to make other chemicals or as a solvent to get oil out of nuts, seeds, and wool.