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74-97-5

Basic Information
CAS No.: 74-97-5
Name: Bromochloromethane
Molecular Structure:
Molecular Structure of 74-97-5 (Bromochloromethane)
Formula: CH2BrCl
Molecular Weight: 129.39
Synonyms: Fluorocarbon 1011;Halon 1011;Methylene bromide chloride;Monochloromonobromomethane;NSC 7294;Methane,bromochloro-;
EINECS: 200-826-3
Density: 1.858 g/cm3
Melting Point: -88 °C
Boiling Point: 65.1 °C at 760 mmHg
Flash Point: 11°C
Solubility: 9 g/L (20 °C) in water
Appearance: white to light yellow crystal powder
Hazard Symbols: HarmfulXn, DangerousN
Risk Codes: 20-36/37/38-59
Safety: 26-37/39-59
Transport Information: UN 1887
PSA: 0.00000
LogP: 1.57760
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Chemistry


IUPAC Name: Bromo(chloro)methane 
Empirical Formula: CH2BrCl
Molecular Weight: 129.3836
Canonical SMILES: C(Cl)Br
InChI: InChI=1S/CH2BrCl/c2-1-3/h1H2
InChIKey: JPOXNPPZZKNXOV-UHFFFAOYSA-N
EINECS: 200-826-3
Product Categories: Pharmaceutical Intermediates; Organics; Method 601; 600 Series Wastewater Methods; 8000 Series Solidwaste Methods; ChloroEPA; Method 601EPA; Method 8010EPA; Method 8021More...Close...; Alkyl; Halogenated Hydrocarbons; Organic Building Blocks; A-BAlphabetic; Alpha Sort; B; BI - BZChemical Class; BromoChemical Class; Chloro; Halogenated; Volatiles/ Semivolatiles 
storage temp.: 2-8 °C
Water Solubility: 9 g/L (20 ºC)
Stability: Stable, but may discolour in light. Incompatible with aluminium, magnesium, zinc, calcium, strong oxidizing agents. 
Index of Refraction: 1.465
Molar Refractivity: 19.26 cm3
Molar Volume: 69.6 cm3
Surface Tension: 29.7 dyne/cm
Density: 1.858 g/cm3
Flash Point: 11 °C 
Enthalpy of Vaporization: 29.44 kJ/mol
Boiling Point: 65.1 °C at 760 mmHg
Vapour Pressure: 172 mmHg at 25 °C
Appearance: white to light yellow crystal powder
Melting Point: -88 °C(lit.)
Classification Code of Chlorobromomethane (CAS NO.74-97-5): Drug / Therapeutic Agent; Mutation data; TSCA Flag T [Subject to the Section 4 test rule under TSCA] 

Uses

  Chlorobromomethane (CAS NO.74-97-5) was invented for use in fire extinguishers by the Germans during the mid-40s, in an attempt to create a less-toxic, more effective alternative to carbon tetrachloride. This was a concern in aircraft and tanks as carbon tetrachloride produced highly toxic by-products when discharged onto a fire. CBM was slightly less toxic, and used up until the late 1960s, being officially banned by the NFPA for use in fire extinguishers in 1969, as safer and more effective agents such as halon 1211 and 1301 were developed.

Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mouse LC50 inhalation 12030mg/m3/7H (12030mg/m3) BEHAVIORAL: GENERAL ANESTHETIC

BEHAVIORAL: MUSCLE WEAKNESS

LUNGS, THORAX, OR RESPIRATION: DYSPNEA
Journal of Industrial Hygiene and Toxicology. Vol. 29, Pg. 382, 1947.
mouse LD50 oral 4300mg/kg (4300mg/kg) BEHAVIORAL: GENERAL ANESTHETIC Journal of Industrial Hygiene and Toxicology. Vol. 29, Pg. 382, 1947.
rabbit LD50 skin > 20gm/kg (20000mg/kg)   National Technical Information Service. Vol. AD-A062-138,
rat LCLo inhalation 28800ppm/15M (28800ppm) BEHAVIORAL: GENERAL ANESTHETIC

BEHAVIORAL: ALTERED SLEEP TIME (INCLUDING CHANGE IN RIGHTING REFLEX)

BEHAVIORAL: TREMOR
U.S. Army, Chemical Corps Medical Laboratories Research Reports. Vol. #113, Pg. 1952,
rat LD50 oral 5gm/kg (5000mg/kg)   "Toxicology of Drugs and Chemicals," Deichmann, W.B., New York, Academic Press, Inc., 1969Vol. -, Pg. 390, 1969

Consensus Reports

Reported in EPA TSCA Inventory.

Safety Profile

Mildly toxic by ingestion and inhalation. Mutation data reported. This material has a narcotic action of moderate intensity, although of prolonged duration. Animals exposed for several weeks to 1000 ppm had blood bromide levels as high as 350 mg/100 g. Therefore, until further data are available, it should be considered at least as toxic as carbon tetrachloride and more than minimal exposure to its vapors should be avoided. Dangerous; when heated to decomposition it emits highly toxic fumes of Br and Cl.
Hazard Codes:  IrritantXi,DangerousN,HarmfulXnToxicT,FlammableF
Risk Statements:  37/38-41-59-36/37/38-20-39/23/24/25-23/24/25-11 
R37/38:Irritating to respiratory system and skin. 
R41:Risk of serious damage to the eyes. 
R59:Dangerous to the ozone layer. 
R36/37/38:Irritating to eyes, respiratory system and skin. 
R20:Harmful by inhalation. 
R39:Danger of very serious irreversible effects. 
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed. 
R11:Highly flammable.
Safety Statements:  26-39-59-37/39-45-36/37 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S39:Wear eye / face protection. 
S59:Refer to manufacturer / supplier for information on recovery / recycling. 
S37/39:Wear suitable gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S36/37:Wear suitable protective clothing and gloves.
RIDADR:  UN 1887 6.1/PG 3
WGK Germany:  2
RTECS:  PA5250000
Hazard Note:  Irritant
HazardClass:  6.1(b)
PackingGroup:  III

Standards and Recommendations

OSHA PEL: TWA 200 ppm
ACGIH TLV: TWA 200 ppm
DFG MAK: 200 ppm (1100 mg/m3)
DOT Classification:  6.1; Label: KEEP AWAY FROM FOOD

Analytical Methods

For occupational chemical analysis use NIOSH: Hydrocarbons, halogenated, 1003.

Specification

  Chlorobromomethane (CAS NO.74-97-5), its Synonyms are Bromochloromethane ; Chloromethyl bromide ; Fluorocarbon 1011 ; Methane, bromochloro- ; Methylene chlorobromide ; Mil-B-4394-B ; Mono-chloro-mono-bromo-methane .