UN/NA Number Reference

DOT Class 4.3 Dangerous When Wet placard

UN 3133: Water-reactive solid, oxidizing, n.o.s.

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 3133 is assigned the proper shipping name Water-reactive solid, oxidizing, n.o.s. in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 4.3 Dangerous When Wet material, Packing Group II. Required label(s): 4.3, 5.1.

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 139)

Hazards: Produces toxic and flammable gases on water contact. TOXIC. May be fatal.

Fire: DO NOT use water. Dry chemical, dry sand.

Spill: Fully encapsulating suit. Keep material dry. Cover with dry earth.

Need the full interactive record? Open UN 3133 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.