UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 266: Dimethylcarbamoyl chloride

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 266 is assigned the proper shipping name Dimethylcarbamoyl 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

Dimethylcarbamoyl chloride appears as a colorless to yellow liquid with a pungent odor. Burns to skin, eyes and mucous membranes. A lachrymator. Used to make dyes and pharmaceuticals.

CAS Number: 79-44-7
Molecular Formula: C3H6ClNO
Molecular Weight: 107.54 g/mol
Color / Form: Clear, colorless liquid.
Boiling Point: 329 to 333 F
Melting Point: -27 °F (NTP, 1992)
Flash Point: 155 F
Specific Gravity: 1.168 (sinks in water)
Vapor Pressure: 1.95 [mmHg]
Vapor Density: 3.73 (heavier than air)
Water Solubility: Decomposes

Regulatory Data

CERCLA RQ (40 CFR 302.4)
1 lb
OSHA PEL
none
NIOSH REL
Ca
IDLH
Ca [N
RCRA Waste Code(s)
[object Object]

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.

Need the full interactive record? Open UN 266 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.