UN 0055 — Cases, cartridge, empty, with primer
Placard: Explosive 1.4S. ERG Guide 114. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 0055 is Cases, cartridge, empty, with primer, a Class 1.4S explosive article assigned to ERG Guide 114. It covers empty cartridge cases that still contain live primers but no projectile or propellant charge.
Hazard overview: UN 0055 presents a limited explosive and fire hazard from primers. Heat may cause localized popping, deflagration, small fragments and smoke, but this entry is not normally treated as a mass explosion hazard when packaged and transported properly.
Response guidance: For a UN 0055 incident, responders should confirm the shipment using papers, markings and ERG Guide 114. Isolate the area, keep personnel out of smoke, control ignition sources when safe and use water spray or fog for fire control from a safe position under local SOP.
Firefighter training notes: Training should emphasize the difference between 1.4S limited explosive articles and higher-hazard Class 1 materials. Common errors include dismissing primer smoke, standing too close to heated packages and failing to check for nearby propellant or ammunition. Incident command should confirm the full shipment and adjust isolation if additional hazards are present.
Regulatory context: Primed empty cartridge cases are regulated as Class 1 explosive articles for transportation. Storage, quantity limits, fire code controls and reporting requirements may vary by jurisdiction. Responders should verify current requirements through shipping papers, SDS or product documents, law enforcement and applicable DOT, OSHA, ATF, NFPA or local authority guidance.
Storage & handling: Primed empty cartridge cases should be stored in compatible packaging away from heat, sparks, open flame, impact and unauthorized access. Keep them separated from loose propellant, incompatible explosives and combustible clutter according to product instructions and local fire code.
UN 0055 Quick Details
Common Hazards of UN 0055
- Minor explosive and fire hazard from live primers.
- Localized popping, deflagration, smoke and small fragments may occur if heated.
- Low mass explosion risk under normal transport conditions.
- Burning primers may produce irritating or toxic smoke.
- Heated containers or packaging may fail and scatter small articles.
- Ignition sources can increase fire involvement and should be controlled when safe.
Chemical Identity & Physical Properties
Metallic cartridge cases (typically brass or steel) containing only a percussion primer, no propellant or projectile. Appear as empty shell casings with primer cup intact at base.
| Also known as | Empty cartridge cases with primerPrimed cartridge casesEmpty brass with primersSpent cartridge cases with live primers |
| Appearance | Metallic cartridge cases (typically brass or steel) containing only a percussion primer, no propellant or projectile. Appear as empty shell casings with primer cup intact at base. |
| Flash Point | Not applicable (explosive article) |
| Boiling Point | Not applicable (metal article) |
| Vapor Density | Not applicable (solid article) |
| Water Reactivity | No significant reaction with water |
Fireground Response Guidance — UN 0055
Extinguishing Media
PPE Requirements
Structural firefighting protective clothing with SCBA is generally appropriate for fire or smoke exposure. Eye protection, gloves and distance should be maintained because primers may pop or scatter small fragments when heated.
Isolation & Evacuation
First Actions for a UN 0055 Incident
- CALL 911. Notify law enforcement if ammunition components or explosives are involved.
- Keep unauthorized personnel away.
- Stage upwind and avoid smoke from burning primers.
- Eliminate ignition sources if it is safe to do so.
- Isolate the area and expand the perimeter if fire grows or additional ammunition components are present.
- Use ERG Guide 114, shipping papers and incident command for isolation and fire response decisions.
📋 Copy & Share Field Card
UN 0055 — Cases, cartridge, empty, with primerUse 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.