UN/NA Number Reference
DOT Class 1.1D Explosive placard

UN 483: Cyclotrimethylenetrinitramine (Rdx), desensitized

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 483 is assigned the proper shipping name Cyclotrimethylenetrinitramine (Rdx), desensitized 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

Cyclotrimethylene trinitramine is an explosive. The explosion can be initiated by a sudden shock, high temperature or a combination of the two. The primary hazard is from blast effect and not from flying projectiles and fragments. Under prolonged exposure to heat or fire they can explode.

CAS Number: 121-82-4
Molecular Formula: C3H6N6O6
Molecular Weight: 222.12 g/mol
Color / Form: White, crystalline powder
Boiling Point: -472 F
Melting Point: 401 °F (NIOSH, 2024)
Flash Point: Explodes (NIOSH, 2024)
Specific Gravity: 1.82 (sinks in water)
Vapor Pressure: 0.0004 mmHg
Water Solubility: Insoluble in water
Log P: log Kow = 0.87

Regulatory Data

OSHA PEL
none
NIOSH REL
TWA 1.5 mg/m 3 ST 3 mg/m 3 [skin]
IDLH
N

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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.