UN/NA Number Reference
DOT Class 4.1 Flammable Solid placard

UN 3242: Azodicarbonamide

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 3242 is assigned the proper shipping name Azodicarbonamide in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 4.1 Flammable Solid material, Packing Group II. 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 133)

Hazards: Flammable. May be ignited by friction, heat, sparks. May burn rapidly with flare-burning effect.

Fire: Water spray, foam, dry chemical. Some may be extinguished with CO2.

Spill: Eliminate ignition sources. Do not touch. Cover with dry earth, sand, or non-combustible material.

Chemical and Physical Properties

Azodicarbonamide appears as a yellow to orange powder. Insoluble in water and common solvents. Soluble in dimethyl sulfoxide. Nontoxic.

CAS Number: 123-77-3
Molecular Formula: C2H4N4O2
Molecular Weight: 116.08 g/mol
Color / Form: Orange-red crystals
Boiling Point: Decomposes
Melting Point: 437 °F (decomposes) (NTP, 1992)
Flash Point: 205 F
Specific Gravity: 1.65 (sinks in water)
Vapor Pressure: 7.1 mmHg at 66.2 F
Water Solubility: less than 0.1 mg/mL at 70 F
Log P: log Kow = -1.7

Special Provisions

49 CFR 172.102 special provision codes for this entry: 38, IB8, T3, TP33. 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 3242 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.