☣️ UN 0072 • CLASS 1
UN 0072 — Cyclonite; RDX; Hexogen, wetted
Placard: Explosive 1.1D. ERG Guide 112. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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UN 0072 Quick Details
UN 0072
Product name: Cyclonite; RDX; Hexogen, wetted
DOT Class: 1
Placard type: Explosive 1.1D
ERG Guide: 112 (check current ERG)
Initial isolation: ERG 112: isolate 500m (1600 ft) all directions; evacuate 1600m (1 mile) downwind if material involved in fire; consider initial evacuation for 800m in all directions
Common Hazards of UN 0072
- Mass explosion hazard — entire load may detonate simultaneously.
- Severe blast overpressure and fragmentation.
- Sensitive to heat, shock, and friction.
- Secondary fire and debris hazard.
Chemical Identity & Physical Properties
| Also known as | RDXHexogenCyclotrimethylenetrinitramineT41,3,5-Trinitro-1,3,5-triazacyclohexaneHexahydro-1,3,5-trinitro-1,3,5-triazine |
| CAS Number | 121-82-4 |
| Appearance | White crystalline solid, odorless. Shipped wetted with water or alcohol to reduce sensitivity. Stable when properly desensitized but extremely hazardous when dry. |
| Flash Point | Not applicable (explosive solid) |
| Boiling Point | Not applicable (decomposes explosively at approximately 230C/446F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No reaction with water; wetting agent used as desensitizer |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 0072
Extinguishing Media
Do not use foam or water streams on dry material; may use water fog from distance to keep wetted explosive cool during fire
PPE Requirements
⚠️ Maximum distance and protective cover required; structural firefighters' protective clothing provides NO protection; withdraw immediately if exposed to fire
Isolation & Evacuation
ERG 112: isolate 500m (1600 ft) all directions; evacuate 1600m (1 mile) downwind if material involved in fire; consider initial evacuation for 800m in all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 112).
First Actions for a UN 0072 Incident
- CALL 911. Then call emergency response telephone number on shipping paper.
- Establish large isolation zone — minimum 500 meters in all directions.
- Stage upwind, uphill; limit personnel to essential responders only.
- Request Hazmat + law enforcement + additional resources immediately.
- Do not fight fire — evacuate and isolate; let burn if no life safety risk.
- Protect exposures only if safe and directed by command.
- Consult current ERG Guide 112 and follow SOP/SOG.
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📋 Copy & Share Field Card
UN 0072 — Cyclonite; RDX; Hexogen, wettedHAZMAT RADIO NOTE — UN 0072
Product: Cyclonite; RDX; Hexogen, wetted
Class 1 / Explosive 1.1D / ERG 112
PPE: Maximum distance and protective cover required; structural firefighters' protective clothing provides NO protection; withdraw immediately if exposed to fire
ISOLATION: ERG 112: isolate 500m (1600 ft) all directions; evacuate 1600m (1 mile) downwind if material involved in fire; consider initial evacuation for 800m in all directions
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 0072 — Cyclonite; RDX; Hexogen, wetted
Class: 1 | Placard: Explosive 1.1D | ERG Guide: 112
Appearance: White crystalline solid, odorless. Shipped wetted with water or alcohol to reduce sensitivity. Stable when properly desensitized but extremely hazardous when dry.
Water Reactivity: No reaction with water; wetting agent used as desensitizer
Extinguishing: Do not use foam or water streams on dry material; may use water fog from distance to keep wetted explosive cool during fire
PPE: Maximum distance and protective cover required; structural firefighters' protective clothing provides NO protection; withdraw immediately if exposed to fire
Isolation: ERG 112: isolate 500m (1600 ft) all directions; evacuate 1600m (1 mile) downwind if material involved in fire; consider initial evacuation for 800m in all directions
— Key Hazards —
• Mass explosion hazard — entire load may detonate simultaneously.
• Severe blast overpressure and fragmentation.
• Sensitive to heat, shock, and friction.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper.
• Establish large isolation zone — minimum 500 meters in all directions.
• Stage upwind, uphill; limit personnel to essential responders only.
• Request Hazmat + law enforcement + additional resources immediately.
SOURCE: allfirefighter.com/hazmat/un/0072 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0072 Cyclonite; RDX; Hexogen, wetted Cls1 ERG112 | allfirefighter.com/hazmat/un/0072SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/0072
Related UN Numbers in Class 1
Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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Frequently Asked Questions about UN 0072
Mass explosion hazard — entire load may detonate simultaneously. Severe blast overpressure and fragmentation. Sensitive to heat, shock, and friction. Secondary fire and debris hazard.
CALL 911. Then call emergency response telephone number on shipping paper. Establish large isolation zone — minimum 500 meters in all directions. Stage upwind, uphill; limit personnel to essential responders only.
Maximum distance and protective cover required; structural firefighters' protective clothing provides NO protection; withdraw immediately if exposed to fire
Water reactivity: No reaction with water; wetting agent used as desensitizer. Recommended extinguishing: Do not use foam or water streams on dry material; may use water fog from distance to keep wetted explosive cool during fire.
ERG Guide 112 recommendation: ERG 112: isolate 500m (1600 ft) all directions; evacuate 1600m (1 mile) downwind if material involved in fire; consider initial evacuation for 800m in all directions
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 112 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.