☣️ UN 0391 • CLASS 1
UN 0391 — RDX and HMX mixtures, 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 0391 Quick Details
UN 0391
Product name: RDX and HMX mixtures, wetted
DOT Class: 1
Placard type: Explosive 1.1D
ERG Guide: 112 (check current ERG)
Initial isolation: ERG 112: Isolate 800m (1/2 mile) in all directions; consider evacuation of 1600m (1 mile) radius if fire or threat of detonation
Common Hazards of UN 0391
- 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 | RDX/HMX mixtureCyclotrimethylenetrinitramine and Cyclotetramethylenetetranitramine mixtureOctogen and Hexogen mixturewetted high explosives mixture |
| Appearance | White to pale yellow crystalline solid, wetted with water or alcohol to reduce sensitivity. Odorless or slight characteristic odor. |
| Flash Point | Not applicable (explosive solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water; wetting agent used for stabilization |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 0391
Extinguishing Media
Do not use water streams or foam; flooding quantities of water only from safe distance to keep explosive wet
PPE Requirements
⚠️ Full protective clothing and positive-pressure SCBA required; approach only if absolutely necessary for life safety
Isolation & Evacuation
ERG 112: Isolate 800m (1/2 mile) in all directions; consider evacuation of 1600m (1 mile) radius if fire or threat of detonation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 112).
First Actions for a UN 0391 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 0391 — RDX and HMX mixtures, wettedHAZMAT RADIO NOTE — UN 0391
Product: RDX and HMX mixtures, wetted
Class 1 / Explosive 1.1D / ERG 112
PPE: Full protective clothing and positive-pressure SCBA required; approach only if absolutely necessary for life safety
ISOLATION: ERG 112: Isolate 800m (1/2 mile) in all directions; consider evacuation of 1600m (1 mile) radius if fire or threat of detonation
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 0391 — RDX and HMX mixtures, wetted
Class: 1 | Placard: Explosive 1.1D | ERG Guide: 112
Appearance: White to pale yellow crystalline solid, wetted with water or alcohol to reduce sensitivity. Odorless or slight characteristic odor.
Water Reactivity: No significant reaction with water; wetting agent used for stabilization
Extinguishing: Do not use water streams or foam; flooding quantities of water only from safe distance to keep explosive wet
PPE: Full protective clothing and positive-pressure SCBA required; approach only if absolutely necessary for life safety
Isolation: ERG 112: Isolate 800m (1/2 mile) in all directions; consider evacuation of 1600m (1 mile) radius if fire or threat of detonation
— 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/0391 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0391 RDX and HMX mixtures, wetted Cls1 ERG112 | allfirefighter.com/hazmat/un/0391SMS / 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/0391
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 0391
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.
Full protective clothing and positive-pressure SCBA required; approach only if absolutely necessary for life safety
Water reactivity: No significant reaction with water; wetting agent used for stabilization. Recommended extinguishing: Do not use water streams or foam; flooding quantities of water only from safe distance to keep explosive wet.
ERG Guide 112 recommendation: ERG 112: Isolate 800m (1/2 mile) in all directions; consider evacuation of 1600m (1 mile) radius if fire or threat of detonation
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.