UN/NA Number Reference
DOT Class 1.1D Explosive placard

UN 402: Ammonium perchlorate

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 402 is assigned the proper shipping name Ammonium perchlorate in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 1.1D Explosive material. Required label(s): 1.1.

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 112)

Hazards: May explode or be projected if heated. Fragments may travel great distances. Fire may produce irritating or toxic gases.

Fire: DO NOT fight fire when it reaches cargo. Evacuate area and let burn. Fight fire from maximum distance.

Spill: Do not touch or walk through spilled material. Isolate spill area immediately.

Chemical and Physical Properties

Ammonium perchlorate appears as a white, crystalline solid or powder. Classified as a division 1.1 explosive if powdered into particles smaller than 15 microns in diameter or if powdered into larger particles but thoroughly dried. Does not readily burn, but will burn if contaminated by combustible material. May explode under prolonged exposure to heat or fire. Used to make rocket propellants, explosives, pyrotechnics, as an etching and engraving agent, and in analytical chemistry.

CAS Number: 7790-98-9
Molecular Formula: ClH4NO4
Molecular Weight: 117.49 g/mol
Color / Form: White orthorhombic crystals.
Odor: Odorless
Melting Point: 130 °C
Autoignition: 464 °F (USCG, 1999)
Specific Gravity: 1.95 (sinks in water)
Vapor Pressure: Very low
Water Solubility: In water, 2.0X10+5 mg/L at 25 C

Special Provisions

49 CFR 172.102 special provision codes for this entry: 107. 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.

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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.