UN 3223: Self-reactive liquid type C

DOT Classification and Shipping

UN 3223 is assigned the proper shipping name Self-reactive liquid type C in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 4.1 Flammable Solid material. Required label(s): 4.1.

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 149)

Hazards: May undergo strongly exothermic decomposition even without oxygen. Decomposition may be initiated by heat, contact with catalytic impurities, friction, or shock. Types A-F vary in sensitivity (Type A most sensitive). Self-accelerating decomposition temperature (SADT) is the key parameter. Temperature-controlled types must remain within shipping temperature limits.

Fire: Cool with water spray from maximum safe distance. Do not move heat-exposed containers. Evacuate area if temperature controls fail or decomposition begins. Burning material may produce toxic gases.

Spill: Do not touch. Keep cool with water spray if compatible. Eliminate ignition sources. Do not allow material to warm above its control or emergency temperature.

Need the full interactive record? Open UN 3223 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.