UN 0408 — Fuzes, detonating, with protective features
Placard: Explosive 1.1B. ERG Guide 112. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 0408 covers detonating fuzes with protective features, classified as Explosive 1.1B under hazmat regulations. These devices are designed to initiate detonation in munitions and carry a mass explosion risk affecting an entire shipment simultaneously.
Hazard overview: The primary hazard of UN 0408 is mass detonation, which can release severe blast overpressure and high-velocity fragmentation across a wide area. Even with protective housings designed to prevent accidental initiation, external fire or shock can trigger simultaneous detonation of the full load.
Response guidance: Emergency responders must isolate a minimum of 500 meters in all directions and evacuate at least 1600 meters downwind if fire is involved. Firefighting should not be attempted for large fires; personnel must withdraw to a safe distance and allow the fire to burn under controlled isolation.
UN 0408 Quick Details
Common Hazards of UN 0408
- 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
UN 0408 fuzes are mechanical or electrical assemblies containing explosive components, typically housed in metal casings engineered to resist accidental initiation during handling and transport.
| Appearance | Mechanical or electrical devices containing explosive components designed to initiate detonation in munitions or explosives. Typically metal assemblies with protective housings to prevent accidental initiation. |
| Flash Point | Not applicable (explosive device) |
| Boiling Point | Not applicable (explosive device) |
| Vapor Density | Not applicable (solid device) |
| Water Reactivity | No significant water reaction for most types, but moisture can affect electrical components in electronic fuzes |
Fireground Response Guidance — UN 0408
Extinguishing Media
PPE Requirements
Minimum Level B protection with SCBA is required; full structural firefighting gear with a proximity suit is recommended when fire is involved, and direct approach should occur only when absolutely necessary.
Isolation & Evacuation
First Actions for a UN 0408 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.
📋 Copy & Share Field Card
UN 0408 — Fuzes, detonating, with protective featuUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.