UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 2474: Thiophosgene

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 2474 is assigned the proper shipping name Thiophosgene 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 I. Required label(s): 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

Thiophosgene appears as a reddish liquid. Boiling point 73.5 °C. A severe eye irritant. May severely burn skin on contact. Very toxic by inhalation and by skin absorption.

CAS Number: 463-71-8
Molecular Formula: CCl2S
Molecular Weight: 114.98 g/mol
Color / Form: Reddish liquid
Odor: Sharp choking odor
Boiling Point: 163 F
Specific Gravity: 1.513 (sinks in water)
Vapor Pressure: 116.0 [mmHg]
Water Solubility: Insoluble in water, soluble in ethanol and ethyl ether

Special Provisions

49 CFR 172.102 special provision codes for this entry: 2, B9, B14, B32, N33, 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 2474 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.