UN/NA Number Reference

UN 484: Cyclotetramethylenetetranitramine (Hmx), desensitized

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 484 is assigned the proper shipping name Cyclotetramethylenetetranitramine (Hmx), 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

Cyclotetramethylene tetranitramine, [wet with >= 10% water] appears as a white crystalline solid. Melting point 281 °C. Practically insoluble in water. Water slurry mitigates explosion hazard. Used in solid propellants and explosives. The primary hazard is the blast effect and not flying projectiles and fragments.

CAS Number: 2691-41-0

Molecular Formula: C4H8N8O8

Molecular Weight: 296.16 g/mol

Color / Form: White crystalline solid

Boiling Point: Decomposition temperature = 280 °C

Melting Point: Melting point equals 281 °C. [CAMEO]

Autoignition: 234 °C

Specific Gravity: Density of the four polymeric forms: 1.903 g/cu cm (beta form); 1.82 g/cu cm (alpha form); 1.82 g/cu cm (gamma form); 1.78 g/cu cm (delta form)

Vapor Pressure: 0.00000002 [mmHg]

Vapor Density: 1.9

Water Solubility: In water, 3.34 mg/L at 20 °C, 4.46 mg/L at 25 °C

Log P: log Kow = 0.16

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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.