UN 0191 — Signal devices, hand
Placard: Explosive 1.4G. ERG Guide 114. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 0191 covers small handheld pyrotechnic devices designed to produce smoke, light, or flame for signaling, and are classified as Division 1.4G explosives with a minor blast or fire hazard. These cylindrical devices contain combustible materials that can undergo localized burning or deflagration if improperly handled or exposed to heat.
Hazard overview: These devices present a localized fire and deflagration hazard, capable of producing smoke and heat if ignited, though their explosive effect is limited in scope. Some formulations may contain water-reactive pyrotechnic compounds, meaning exposure to moisture can trigger accidental ignition.
Response guidance: Establish an isolation perimeter of at least 25 meters in all directions from any UN 0191 incident, and expand evacuation to 800 meters if fire or explosion is involved. Apply water spray only from a safe distance and use dry chemical or sand as alternatives, avoiding direct water application on actively burning pyrotechnic devices.
UN 0191 Quick Details
Common Hazards of UN 0191
- 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 0191 signal devices are small, typically cylindrical handheld pyrotechnic units that vary in color depending on their signal type and contain combustible materials engineered to generate smoke, light, or flame.
| Also known as | Hand-held signal devicesHand flaresMarine distress signalsPyrotechnic signal devicesHand-held smoke signals |
| Appearance | Small handheld pyrotechnic devices, typically cylindrical, containing combustible materials designed to produce smoke, light, or flame for signaling purposes. Various colors depending on signal type. |
| Flash Point | Not applicable (pyrotechnic device) |
| Boiling Point | Not applicable (solid pyrotechnic composition) |
| Vapor Density | Not applicable (solid device) |
| Water Reactivity | May contain water-reactive pyrotechnic compounds; keep dry to prevent accidental ignition |
Fireground Response Guidance — UN 0191
Extinguishing Media
PPE Requirements
Responders handling UN 0191 devices must wear structural firefighters' protective clothing equipped with SCBA, along with appropriate eye and hand protection.
Isolation & Evacuation
First Actions for a UN 0191 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 0191 — Signal devices, handUse 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.