☣️ UN 0226 • CLASS 1
HMX; Octogen, wetted
Placard: Explosive 1.1D. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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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Quick details
UN 0226
Class: 1
Placard type: Explosive 1.1D
ERG: Guide 112 (check current ERG)
Isolation: ERG 112: Isolate 500m (1600 ft) all directions initially. Evacuate 1600m (1 mile) radius if fire or containers exposed to fire.
Chemical & Response Details
| Also known as | OctogenCyclotetramethylenetetranitramine1,3,5,7-Tetranitro-1,3,5,7-tetraazacyclooctaneHMX wettedHigh Melting Explosive |
| CAS Number | 2691-41-0 |
| Appearance | White crystalline solid, odorless. Supplied wetted with water or alcohol to reduce sensitivity. Stable when properly wetted. |
| Flash Point | Not applicable (explosive solid, wetted formulation) |
| Boiling Point | Not applicable (decomposes at approximately 280C/536F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water; wetting agent maintains stability |
| Extinguishing | DO NOT fight fire — evacuate and allow to burn. If must extinguish: water spray from distance only |
| PPE | ⚠️ Minimum Level B with SCBA required. Full blast-resistant protective equipment for approaching wetted explosive. Never approach unwetted material. |
| Isolation | ERG 112: Isolate 500m (1600 ft) all directions initially. Evacuate 1600m (1 mile) radius if fire or containers exposed to fire. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Mass explosion hazard — entire load may detonate simultaneously.
- Severe blast overpressure and fragmentation.
- Sensitive to heat, shock, and friction.
- Secondary fire and debris hazard.
First actions (field-minded)
- 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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UN 0226 — HMX; Octogen, wetted HAZMAT RADIO NOTE — UN 0226
Product: HMX; Octogen, wetted
Class 1 / Explosive 1.1D / ERG 112
PPE: Minimum Level B with SCBA required. Full blast-resistant protective equipment for approaching wetted explosive. Never approach unwetted material.
ISOLATION: ERG 112: Isolate 500m (1600 ft) all directions initially. Evacuate 1600m (1 mile) radius if fire or containers exposed to fire.
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 0226 — HMX; Octogen, wetted
Class: 1 | Placard: Explosive 1.1D | ERG Guide: 112
Appearance: White crystalline solid, odorless. Supplied wetted with water or alcohol to reduce sensitivity. Stable when properly wetted.
Water Reactivity: No significant reaction with water; wetting agent maintains stability
Extinguishing: DO NOT fight fire — evacuate and allow to burn. If must extinguish: water spray from distance only
PPE: Minimum Level B with SCBA required. Full blast-resistant protective equipment for approaching wetted explosive. Never approach unwetted material.
Isolation: ERG 112: Isolate 500m (1600 ft) all directions initially. Evacuate 1600m (1 mile) radius if fire or containers exposed to fire.
— 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/0226 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0226 HMX; Octogen, wetted Cls1 ERG112 | ERG 112: Isolate 500m (1600 ft) all directions initially. Evacuate 1600m (1 mile | allfirefighter.com/hazmat/un/0226SMS / 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/0226
Related UN numbers (same class)
Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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FAQ
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.
Minimum Level B with SCBA required. Full blast-resistant protective equipment for approaching wetted explosive. Never approach unwetted material.
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.