☣️ UN 0484 • CLASS 1
Cyclotetramethylenetetranitramine; HMX, desensitized
Placard: Explosive 1.1D. 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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Quick details
UN 0484
Class: 1
Placard type: Explosive 1.1D
ERG: Guide 112 (check current ERG)
Isolation: ERG 112: Isolate spill or leak area immediately for at least 500 meters in all directions. Evacuate 1600 meters in all directions if tank, rail car, or tank truck is involved in fire. Consider initial downwind evacuation for at least 2500 meters.
Chemical & Response Details
| Also known as | HMXOctogenCyclotetramethylene tetranitramine1,3,5,7-Tetranitro-1,3,5,7-tetrazocaneOctahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine |
| CAS Number | 2691-41-0 |
| Appearance | White to pale yellow crystalline solid. Odorless. Stable at room temperature but sensitive to shock, friction, and heat when not desensitized. |
| Flash Point | Not applicable (explosive solid) |
| Boiling Point | Not applicable (decomposes before boiling at approximately 279°C) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water; insoluble in water |
| Extinguishing | Do not use water or foam; use only approved methods for explosive fires from safe distance |
| PPE | ⚠️ Full protective clothing and SCBA required. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. Approach only from upwind direction. |
| Isolation | ERG 112: Isolate spill or leak area immediately for at least 500 meters in all directions. Evacuate 1600 meters in all directions if tank, rail car, or tank truck is involved in fire. Consider initial downwind evacuation for at least 2500 meters. |
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 0484 — Cyclotetramethylenetetranitramine; HMX, HAZMAT RADIO NOTE — UN 0484
Product: Cyclotetramethylenetetranitramine; HMX, desensitized
Class 1 / Explosive 1.1D / ERG 112
PPE: Full protective clothing and SCBA required. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. Approach only from upwind direction.
ISOLATION: ERG 112: Isolate spill or leak area immediately for at least 500 meters in all directions. Evacuate 1600 meters in all directions if tank, rail car, or tank truck is involved in fire. Consider initial downwind evacuation for at least 2500 meters.
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 0484 — Cyclotetramethylenetetranitramine; HMX, desensitized
Class: 1 | Placard: Explosive 1.1D | ERG Guide: 112
Appearance: White to pale yellow crystalline solid. Odorless. Stable at room temperature but sensitive to shock, friction, and heat when not desensitized.
Water Reactivity: No significant reaction with water; insoluble in water
Extinguishing: Do not use water or foam; use only approved methods for explosive fires from safe distance
PPE: Full protective clothing and SCBA required. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. Approach only from upwind direction.
Isolation: ERG 112: Isolate spill or leak area immediately for at least 500 meters in all directions. Evacuate 1600 meters in all directions if tank, rail car, or tank truck is involved in fire. Consider initial downwind evacuation for at least 2500 meters.
— 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/0484 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0484 Cyclotetramethylenetetranitramine; HMX, desensitized Cls1 ERG112 | allfirefighter.com/hazmat/un/0484SMS / 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/0484
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.
Full protective clothing and SCBA required. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. Approach only from upwind direction.
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.