UN/NA Number Reference
DOT Class 8 Corrosive placard

UN 2692: Boron tribromide

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2692 is assigned the proper shipping name Boron tribromide in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 8 Corrosive material, Packing Group I. Required label(s): 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 157)

Hazards: TOXIC and/or CORROSIVE. Reacts with water. Non-combustible in themselves.

Fire: DO NOT use water. Dry chemical, CO2, dry sand.

Spill: Do not touch. Keep material dry.

Chemical and Physical Properties

Boron tribromide appears as a colorless, fuming liquid with a pungent odor. Boiling point 194 °F. Freezing point -51 °F. Very toxic by inhalation. Corrosive to metals and tissue.

CAS Number: 10294-33-4
Molecular Formula: BBr3
Molecular Weight: 250.53 g/mol
Color / Form: Colorless, fuming liquid
Odor: Sharp, irritating odor
Boiling Point: 196 F
Melting Point: -51 °F (USCG, 1999)
Specific Gravity: 2.645 (sinks in water)
Vapor Pressure: 40 mmHg at 57 F
Vapor Density: 8.6 (heavier than air)
Water Solubility: Decomposes

Regulatory Data

OSHA PEL
none
NIOSH REL
C 1 ppm (10 mg/m 3 )
IDLH
N

Special Provisions

49 CFR 172.102 special provision codes for this entry: 2, B9, B14, B32, N34, T20, TP2, TP13, TP38, TP45. 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 2692 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.