UN/NA Number Reference
DOT Class 5.1 Oxidizer placard

UN 1746: Bromine trifluoride

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1746 is assigned the proper shipping name Bromine trifluoride in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 5.1 Oxidizer material, Packing Group I. Required label(s): 5.1, 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 144)

Hazards: Oxidizer. Reacts with water. May produce toxic or corrosive solutions.

Fire: DO NOT use water directly. Use dry chemical, sand.

Spill: Keep material dry. Keep combustibles away.

Chemical and Physical Properties

Bromine trifluoride appears as a colorless to yellow, fuming liquid with a pungent odor. Solidifies at 48 °F. Very toxic by inhalation and corrosive to metals and tissue. Containers exposed to prolonged heat may violently rupture and rocket.

CAS Number: 7787-71-5
Molecular Formula: BrF3
Molecular Weight: 136.90 g/mol
Color / Form: Colorless liquid; also reported to be pale yellow. Long prisms when solid.
Boiling Point: 258.4 F
Melting Point: 47.8 °F (USCG, 1999)
Specific Gravity: 2.81 (sinks in water)
Vapor Pressure: 2.8030 g/cu cm at 25 C

Special Provisions

49 CFR 172.102 special provision codes for this entry: 2, B9, B14, B32, T22, 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 1746 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.