UN 0509 — Primers, cap type
Placard: Explosive 1.4S. ERG Guide 114. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 0509 is Primers, cap type, a Class 1.4S explosive article assigned to ERG Guide 114. It is a limited-effect initiator-type article, but heat, shock, static or damage can still create a dangerous localized blast hazard.
Hazard overview: UN 0509 presents a localized initiator hazard. Heat, impact, friction, static, electrical energy or mechanical disturbance may cause popping, deflagration or small blast effects, and grouped articles can still injure nearby personnel.
Response guidance: For a UN 0509 incident, responders should confirm the article using shipping papers, markings and ERG Guide 114. Isolate the area, avoid disturbing leads or damaged units, control ignition and static sources when safe, and request explosive specialists if condition or quantity is uncertain.
Firefighter training notes: Training should emphasize the difference between limited-effect explosives and higher-hazard Class 1 materials. Common errors include standing too close to heated packages, dismissing smoke hazards, disturbing damaged articles and failing to check for adjacent explosives or ammunition.
Regulatory context: Primers, cap type is regulated as a Class 1 explosive hazardous material. 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 and applicable DOT, ATF, OSHA, NFPA, military, state or local authority guidance.
Storage & handling: Primers, cap type should be stored only in approved packaging, magazines or authorized explosive storage areas, separated from ignition sources, incompatible materials and unauthorized access. Packages should be protected from heat, impact, friction, moisture where relevant and physical damage according to product documentation and applicable explosive storage regulations.
UN 0509 Quick Details
Common Hazards of UN 0509
- Minor explosive hazard with localized blast, popping or fragment effects possible if initiated.
- Initiating components may be sensitive to heat, impact, friction, static or electrical energy depending on design.
- Smoke and heat from burning articles may irritate the eyes and respiratory tract.
- Low mass explosion risk under normal transport conditions, but grouped articles can still injure nearby personnel.
- Heated packages may fail and scatter small articles or fragments.
- Nearby explosives, ammunition or pyrotechnics may increase the overall incident hazard.
Chemical Identity & Physical Properties
Small metallic cups or assemblies containing sensitive primary explosive compounds. Typically brass or copper colored, varying sizes from pistol to large rifle primers.
| Also known as | Percussion capsBlasting caps (cap type)Primer capsSmall arms primersIgnition caps |
| Appearance | Small metallic cups or assemblies containing sensitive primary explosive compounds. Typically brass or copper colored, varying sizes from pistol to large rifle primers. |
| Flash Point | Not applicable (explosive composition) |
| Boiling Point | Not applicable (decomposes/detonates) |
| Vapor Density | Not applicable (solid composition) |
| Water Reactivity | Generally stable with water, but avoid contamination which may affect sensitivity |
Fireground Response Guidance — UN 0509
Extinguishing Media
PPE Requirements
Structural firefighting protective clothing with SCBA is appropriate for fire or smoke exposure, with distance maintained from heated packages. Approach and handling should follow incident command and local SOP.
Isolation & Evacuation
First Actions for a UN 0509 Incident
- CALL 911. Notify law enforcement if explosive articles, ordnance or pyrotechnic devices are involved.
- Keep unauthorized personnel away.
- Stage upwind and avoid smoke from burning articles.
- Avoid static sources, electrical leads, radios near exposed initiators, or mechanical disturbance unless cleared by specialists.
- Eliminate ignition sources if it is safe to do so.
- Isolate the area and expand the perimeter if fire grows or additional explosives are present.
- Use ERG Guide 114, shipping papers and incident command for isolation and fire response decisions.
📋 Copy & Share Field Card
UN 0509 — Primers, cap typeUse 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.