☣️ UN 0403 • CLASS 1
Flares, aerial
Placard: Explosive 1.3G. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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Quick details
UN 0403
Class: 1
Placard type: Explosive 1.3G
ERG: Guide 112 (check current ERG)
Isolation: ERG 112: Initial isolation 500 meters in all directions; if fire or cargo involved in fire, consider evacuation for 1600 meters in all directions; protect from heat and ignition sources
Chemical & Response Details
| Also known as | Aerial flaresSignal flaresPyrotechnic flaresIlluminating flaresDistress flares |
| Appearance | Cylindrical pyrotechnic devices containing combustible materials and oxidizers, typically in metal or plastic housings. Designed to produce intense light and heat when ignited. |
| Flash Point | Not applicable (pyrotechnic composition) |
| Boiling Point | Not applicable (pyrotechnic composition) |
| Vapor Density | Not applicable (solid pyrotechnic device) |
| Water Reactivity | May contain water-reactive metals such as magnesium or aluminum; avoid water application on burning flares |
| Extinguishing | Do not use water or foam; use dry sand, dry chemical, or soda ash to cover and smother; allow to burn out in controlled area if safe |
| PPE | ⚠️ Full protective clothing and positive-pressure SCBA required; face shield and heat-resistant gloves; maintain safe distance due to intense heat and potential fragment projection |
| Isolation | ERG 112: Initial isolation 500 meters in all directions; if fire or cargo involved in fire, consider evacuation for 1600 meters in all directions; protect from heat and ignition sources |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Fire and burning hazard — not mass explosion.
- Intense heat and possible fragment projection.
- May deflagrate and initiate other materials.
- Smoke and toxic combustion products.
First actions (field-minded)
- CALL 911. Then call emergency response telephone number on shipping paper.
- Isolate area; stage upwind — fire and fragment hazard.
- Request Hazmat + law enforcement.
- Control ignition sources; deny entry.
- Consult current ERG Guide 112 and follow SOP/SOG.
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UN 0403 — Flares, aerial HAZMAT RADIO NOTE — UN 0403
Product: Flares, aerial
Class 1 / Explosive 1.3G / ERG 112
PPE: Full protective clothing and positive-pressure SCBA required; face shield and heat-resistant gloves; maintain safe distance due to intense heat and potential fragment projection
ISOLATION: ERG 112: Initial isolation 500 meters in all directions; if fire or cargo involved in fire, consider evacuation for 1600 meters in all directions; protect from heat and ignition sources
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 0403 — Flares, aerial
Class: 1 | Placard: Explosive 1.3G | ERG Guide: 112
Appearance: Cylindrical pyrotechnic devices containing combustible materials and oxidizers, typically in metal or plastic housings. Designed to produce intense light and heat when ignited.
Water Reactivity: May contain water-reactive metals such as magnesium or aluminum; avoid water application on burning flares
Extinguishing: Do not use water or foam; use dry sand, dry chemical, or soda ash to cover and smother; allow to burn out in controlled area if safe
PPE: Full protective clothing and positive-pressure SCBA required; face shield and heat-resistant gloves; maintain safe distance due to intense heat and potential fragment projection
Isolation: ERG 112: Initial isolation 500 meters in all directions; if fire or cargo involved in fire, consider evacuation for 1600 meters in all directions; protect from heat and ignition sources
— Key Hazards —
• Fire and burning hazard — not mass explosion.
• Intense heat and possible fragment projection.
• May deflagrate and initiate other materials.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper.
• Isolate area; stage upwind — fire and fragment hazard.
• Request Hazmat + law enforcement.
• Control ignition sources; deny entry.
SOURCE: allfirefighter.com/hazmat/un/0403 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0403 Flares, aerial Cls1 ERG112 | ERG 112: Initial isolation 500 meters in all directions; if fire or cargo involv | allfirefighter.com/hazmat/un/0403SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions. Page: https://allfirefighter.com/hazmat/un/0403
Related UN numbers (same class)
Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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FAQ
Fire and burning hazard — not mass explosion. Intense heat and possible fragment projection. May deflagrate and initiate other materials. Smoke and toxic combustion products.
CALL 911. Then call emergency response telephone number on shipping paper. Isolate area; stage upwind — fire and fragment hazard. Request Hazmat + law enforcement.
Full protective clothing and positive-pressure SCBA required; face shield and heat-resistant gloves; maintain safe distance due to intense heat and potential fragment projection
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 112 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles. This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.