UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 1737: Benzyl bromide

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1737 is assigned the proper shipping name Benzyl bromide 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 II. Required label(s): 6.1, 8.

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 156)

Hazards: TOXIC or CORROSIVE. FLAMMABLE. Vapors may travel to ignition source.

Fire: Alcohol-resistant foam, dry chemical, CO2. Water spray for cooling only.

Spill: Eliminate ignition sources. Do not touch. Ventilate area.

Chemical and Physical Properties

Benzyl bromide appears as a colorless liquid with an agreeable odor. Toxic by inhalation and by skin absorption. It is slightly soluble in water and denser than water (density 1.44 g / cm3 (Aldrich)). A lachrymator. Corrosive to metals and tissue.

CAS Number: 100-39-0
Molecular Formula: C7H7Br
Molecular Weight: 171.03 g/mol
Color / Form: Clear, refractive liquid
Odor: Very sharp; pungent; like tear gas
Boiling Point: 388 to 390 F
Melting Point: 27 to 30 °F (NTP, 1992)
Flash Point: 188 F
Specific Gravity: 1.441 (sinks in water)
Vapor Pressure: 1 mmHg at 90 F
Vapor Density: 5.8 (heavier than air)
Water Solubility: Reaction
Log P: log Kow = 2.92

Special Provisions

49 CFR 172.102 special provision codes for this entry: A3, A7, IB2, N33, N34, T8, TP2, TP13. 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.

Need the full interactive record? Open UN 1737 in the SpillNerd lookup tool for the live database entry with placard graphics, GHS pictograms, full segregation tables, and synonym search. For another material, use the UN number and chemical lookup.

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.