UN 0320 — Primers, tubular
Placard: Explosive 1.4G. ERG Guide 114. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 0320 Primers, tubular are small impact-sensitive explosive devices, typically brass or copper-colored cylinders used to initiate ignition in firearms and propellant systems. Though classified as 1.4G with limited blast effect, they pose localized fire and deflagration risks requiring careful handling and storage.
Hazard overview: These tubular percussion primers contain a small impact-sensitive explosive mixture capable of localized burning or deflagration if struck, crushed, or exposed to sufficient heat. Smoke and thermal hazards from burning primers present inhalation and secondary fire risks in enclosed or bulk storage environments.
Response guidance: Isolate the spill or leak area a minimum of 25 meters in all directions, and evacuate an 800-meter radius if fire or explosion is involved, per ERG Guide 114. Apply water spray or fog to suppress fire and cool adjacent materials, but do not attempt to move primers that have been exposed to heat or flame.
UN 0320 Quick Details
Common Hazards of UN 0320
- Minor blast or fire hazard — limited effect.
- Localized burning or deflagration possible.
- Smoke and heat from burning.
- Low mass explosion risk under normal conditions.
Chemical Identity & Physical Properties
UN 0320 primers are small, solid cylindrical metallic devices — typically brass or copper in color — containing a minimal quantity of impact-sensitive explosive compound.
| Also known as | Tubular primersPercussion primersIgnition primersSmall arms primers |
| Appearance | Small cylindrical metallic devices containing a small amount of impact-sensitive explosive mixture. Typically brass or copper colored, solid at room temperature. |
| Flash Point | Not applicable (explosive device) |
| Boiling Point | Not applicable (explosive device) |
| Vapor Density | Not applicable (solid device) |
| Water Reactivity | No significant reaction with water |
Fireground Response Guidance — UN 0320
Extinguishing Media
PPE Requirements
Responders should wear Level C protection minimum, including fire-resistant clothing, a face shield, chemical-resistant gloves, and SCBA when primers are involved in fire or producing smoke.
Isolation & Evacuation
First Actions for a UN 0320 Incident
- CALL 911. Notify law enforcement.
- Isolate area; keep unauthorized personnel away.
- Stage upwind; eliminate ignition sources.
- Request Hazmat + law enforcement.
- Consult current ERG Guide 114 and follow SOP/SOG.
📋 Copy & Share Field Card
UN 0320 — Primers, tubularUse 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.