UN/NA Number Reference
DOT Class 8 Corrosive placard

UN 1731: Antimony pentafluoride

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1731 is assigned the proper shipping name Antimony pentafluoride in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 8 Corrosive material, Packing Group II. 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 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

Antimony pentafluoride appears as a colorless, oily liquid. Fumes irritate the eyes and mucous membranes. Toxic. Corrosive to metals and tissue. Extremely dangerous to tissue; its burns may be followed by gangrene. Only shipped in cylinders. Under prolonged exposure to heat cylinders may violently rupture and rocket. Used to make other chemicals as well as a catalyst in the manufacture of other chemicals.

CAS Number: 7783-70-2
Molecular Formula: F5Sb
Molecular Weight: 216.752 g/mol
Color / Form: Hygroscopic, moderately viscous liquid
Odor: Sharp odor
Boiling Point: 286 F
Melting Point: 47 °F (EPA, 1998)
Specific Gravity: 3.097 (sinks in water)
Vapor Pressure: Vapor pressure, kPa at 25Â C: 1.33
Water Solubility: Reacts violently with water

Regulatory Data

EPCRA TPQ (40 CFR 355)
500 lb

Special Provisions

49 CFR 172.102 special provision codes for this entry: B2, IB2, T7, TP2. 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 1731 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.