UN/NA Number Reference

UN 1744: Bromine or bromine solution

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1744 is assigned the proper shipping name Bromine or bromine solution 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, 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 154)

Hazards: TOXIC. Corrosive. Non-combustible but may decompose producing toxic fumes when heated.

Fire: Use agent appropriate for surrounding fire. Cool containers.

Spill: Do not touch. Avoid inhalation. Use water spray to reduce fumes.

Chemical and Physical Properties

Bromine is a dark reddish-brown fuming liquid with a pungent odor. Denser than water and soluble in water. Hence sinks in water. Toxic by inhalation. Accelerates the burning of combustible material. It is very corrosive to tissue and to metals.

CAS Number: 7726-95-6

Molecular Formula: Br2

Molecular Weight: 159.81 g/mol

Color / Form: Dark reddish-brown, volatile, mobile diatomic liquid; vaporizes at room temperature

Odor: Suffocating odor

Boiling Point: 139.2 °F at 760 mmHg (EPA, 1998)

Melting Point: 19 °F (EPA, 1998)

Autoignition: Not flammable (USCG, 1999)

Specific Gravity: 3.1023 at 77 °F (EPA, 1998) - Denser than water; will sink

Vapor Pressure: 172 mmHg at 69.08 °F (EPA, 1998)

Vapor Density: 5.51 at 59 °F (EPA, 1998) - Heavier than air; will sink (Relative to Air)

Water Solubility: 4 % (NIOSH, 2024)

Regulatory Data

CERCLA RQ (40 CFR 302.4)

1 lb

EPCRA TPQ (40 CFR 355)

500 lb

OSHA PEL

TWA 0.1 ppm (0.7 mg/m 3 )

NIOSH REL

TWA 0.1 ppm (0.7 mg/m 3 ) ST 0.3 ppm (2 mg/m 3 )

IDLH

3 ppm

A release of this material at or above its CERCLA reportable quantity (1 lb) requires immediate notification to the National Response Center at 800-424-8802.

Special Provisions

49 CFR 172.102 special provision codes for this entry: 2, B9, B85, N34, N43, T22, TP2, TP10, 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 1744 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.