UN 0383 — Components, explosive train, n.o.s.
Placard: Explosive 1.2B. ERG Guide 112. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 0383 designates assembled explosive train components—combinations of primers, detonators, boosters, and main charges in sequential housings—classified as Class 1.2B explosives. Unlike their 1.1B counterparts, these assemblies are not expected to mass detonate, but they present a serious projection and fragmentation hazard upon initiation.
Hazard overview: Initiation of UN 0383 assemblies produces significant blast overpressure in the immediate area and propels housing fragments and explosive subcomponents at dangerous velocities. The multi-component sequential design means that initiation of one stage can propagate through the train, amplifying the fragmentation hazard beyond a single detonator event.
Response guidance: Establish an initial isolation of 500 meters in all directions and evacuate 1,600 meters if fire or explosion is involved; a minimum 1,000-foot exclusion zone must be enforced and only EOD-qualified personnel may approach. Do not apply water or foam; if suppression is absolutely necessary after expert consultation, dry chemical or sand from a protected standoff position are the only options.
UN 0383 Quick Details
Common Hazards of UN 0383
- Projection and fragmentation hazard on initiation.
- Blast overpressure in immediate area.
- Sensitive to heat, shock, or electrical current.
- May initiate other explosives in proximity.
Chemical Identity & Physical Properties
UN 0383 assemblies consist of multiple explosive components arranged in sequence within metal or plastic housings, with configurations ranging from compact initiator stacks to larger multi-stage assemblies depending on the intended application.
| Also known as | Explosive train assembliesDetonator assembliesInitiator componentsExplosive transmission devices |
| Appearance | Assembled explosive devices containing multiple explosive components in sequence (primers, detonators, boosters, main charges). Typically metal or plastic housings containing solid explosive materials. May vary in size and configuration depending on application. |
| Flash Point | Not applicable (explosive solid) |
| Boiling Point | Not applicable (explosive material) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water, but moisture may affect reliability of electrical components |
Fireground Response Guidance — UN 0383
Extinguishing Media
PPE Requirements
A minimum 1,000-foot evacuation applies to all non-EOD personnel; any required approach demands full Level A with blast-resistant gear and SCBA, and must be performed exclusively by trained explosive ordnance disposal specialists.
Isolation & Evacuation
First Actions for a UN 0383 Incident
- CALL 911. Then call emergency response telephone number on shipping paper.
- Isolate minimum 500 meters; stage upwind and uphill.
- Request Hazmat + law enforcement immediately.
- Control ignition sources; deny unauthorized entry.
- Do not approach — projectile/fragmentation hazard.
- Consult current ERG Guide 112 and follow SOP/SOG.
📋 Copy & Share Field Card
UN 0383 — Components, explosive train, n.o.s.Use 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.