UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 1834: Sulfuryl chloride

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1834 is assigned the proper shipping name Sulfuryl chloride 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, 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 137)

Hazards: Produce flammable gases on contact with water. May ignite on contact with water. Some react violently with water.

Fire: DO NOT use water or foam. Use dry chemical, dry sand, or soda ash.

Spill: Do not touch. Keep material dry. Move containers from water. Dike to prevent water contact.

Chemical and Physical Properties

Sulfuryl chloride appears as a colorless fuming liquid with a pungent odor. Very toxic by inhalation. Corrosive to metals and tissue.

CAS Number: 7791-25-5
Molecular Formula: Cl2O2S
Molecular Weight: 134.97 g/mol
Color / Form: Colorless, mobile liquid
Odor: Very pungent odor
Boiling Point: 156.4 F
Melting Point: -54.1 °C
Autoignition: Not flammable (USCG, 1999)
Specific Gravity: 1.67 (sinks in water)
Vapor Pressure: 140.0 [mmHg]
Vapor Density: 4.6 (heavier than air)
Water Solubility: Miscible with benzene, toluene, ether, glacial acetic acid, and other org solvents

Special Provisions

49 CFR 172.102 special provision codes for this entry: 1, B6, B9, B10, B14, B30, B77, N34, T22, TP2, TP13, TP38, TP44. 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 1834 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.