UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 1887: Bromochloromethane

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1887 is assigned the proper shipping name Bromochloromethane in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 6.1 Toxic Substance material, Packing Group III. Required label(s): 6.1.

Packing group indicates the degree of danger within a hazard class: PG I is high danger, PG II medium, PG III low. The proper shipping name, hazard class, UN number, and packing group together form the basic shipping description that must appear on shipping papers and, where required, on the package and placard.

Emergency Response (ERG Guide 160)

Hazards: Non-flammable in most cases. Toxic by inhalation. Vapors heavier than air. Decomposes in fire producing toxic gases including phosgene.

Fire: Use water spray, dry chemical, CO2, foam.

Spill: Ventilate area. Absorb with earth/sand. Prevent runoff to waterways.

Chemical and Physical Properties

Bromochloromethane appears as a clear colorless liquid with a sweet chloroform-like odor. Denser than water (density 1.991 g / cm3) and insoluble in water. Hence sinks in water. Boiling point 68 °C. Vapors may cause illness if inhaled. Nonflammable. When exposed to high temperatures may emit toxic fumes. Used as a fire extinguishing agent.

CAS Number: 74-97-5
Molecular Formula: CH2BrCl
Molecular Weight: 129.38 g/mol
Color / Form: Clear, colorless liquid
Odor: 2100 mg/cu m (odor threshold low); 2100 mg/cu m (odor threshold high) sweet.
Boiling Point: 154 F
Melting Point: -126 °F (NTP, 1992)
Flash Point: No flash or fire points by standard tests in air.
Specific Gravity: 1.93 (sinks in water)
Vapor Pressure: 117 mmHg at 68 F
Vapor Density: 4.46 (heavier than air)
Water Solubility: 1 to 5 mg/mL at 68 F
Log P: log Kow = 1.41

Regulatory Data

OSHA PEL
TWA 200 ppm (1050 mg/m 3 )
NIOSH REL
TWA 200 ppm (1050 mg/m 3 )
IDLH
2000 ppm

Special Provisions

49 CFR 172.102 special provision codes for this entry: IB3, T4, TP1. These codes modify the general requirements (packaging, quantity limits, exceptions) for this specific material. Look up each code in 49 CFR 172.102 for the full text.

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Reference data compiled from the DOT Hazardous Materials Table (49 CFR 172.101), the 2024 Emergency Response Guidebook, and public chemical databases (PubChem, NIOSH, EPA). Always verify the correct shipping description against the current regulation and the manufacturer's SDS Section 14 before shipping.