☣️ UN 0373 • CLASS 1
UN 0373 — Signal devices, hand
Placard: Explosive 1.4S. ERG Guide 114. 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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UN 0373 Quick Details
UN 0373
Product name: Signal devices, hand
DOT Class: 1
Placard type: Explosive 1.4S
ERG Guide: 114 (check current ERG)
Initial isolation: ERG 114: Isolate spill or leak area immediately for at least 50 meters in all directions; if fire or explosion occurs, isolate 800 meters in all directions
Common Hazards of UN 0373
- 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
| Also known as | Hand-held signal devicesHandheld flaresMarine distress signalsHand signal flaresPyrotechnic signal devices |
| Appearance | Small cylindrical or tube-shaped devices, typically red or orange colored, containing pyrotechnic compositions that produce colored flames or smoke when ignited. |
| Flash Point | Not applicable (pyrotechnic device) |
| Boiling Point | Not applicable (pyrotechnic device) |
| Vapor Density | Not applicable (solid pyrotechnic) |
| Water Reactivity | May react with water depending on composition; keep dry during storage |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 0373
Extinguishing Media
Water spray, foam, dry chemical, or CO2 for small fires; use water at distance for large fires
PPE Requirements
⚠️ Structural firefighters' protective clothing may provide limited protection; positive pressure SCBA recommended
Isolation & Evacuation
ERG 114: Isolate spill or leak area immediately for at least 50 meters in all directions; if fire or explosion occurs, isolate 800 meters in all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 114).
First Actions for a UN 0373 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.
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📋 Copy & Share Field Card
UN 0373 — Signal devices, handHAZMAT RADIO NOTE — UN 0373
Product: Signal devices, hand
Class 1 / Explosive 1.4S / ERG 114
PPE: Structural firefighters' protective clothing may provide limited protection; positive pressure SCBA recommended
ISOLATION: ERG 114: Isolate spill or leak area immediately for at least 50 meters in all directions; if fire or explosion occurs, isolate 800 meters in all directions
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 0373 — Signal devices, hand
Class: 1 | Placard: Explosive 1.4S | ERG Guide: 114
Appearance: Small cylindrical or tube-shaped devices, typically red or orange colored, containing pyrotechnic compositions that produce colored flames or smoke when ignited.
Water Reactivity: May react with water depending on composition; keep dry during storage
Extinguishing: Water spray, foam, dry chemical, or CO2 for small fires; use water at distance for large fires
PPE: Structural firefighters' protective clothing may provide limited protection; positive pressure SCBA recommended
Isolation: ERG 114: Isolate spill or leak area immediately for at least 50 meters in all directions; if fire or explosion occurs, isolate 800 meters in all directions
— Key Hazards —
• Minor blast or fire hazard — limited effect.
• Localized burning or deflagration possible.
• Smoke and heat from burning.
— First Actions —
• CALL 911. Notify law enforcement.
• Isolate area; keep unauthorized personnel away.
• Stage upwind; eliminate ignition sources.
• Request Hazmat + law enforcement.
SOURCE: allfirefighter.com/hazmat/un/0373 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0373 Signal devices, hand Cls1 ERG114 | ERG 114: Isolate spill or leak area immediately for at least 50 meters in all di | allfirefighter.com/hazmat/un/0373SMS / 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/0373
Related UN Numbers in Class 1
Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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Frequently Asked Questions about UN 0373
Minor blast or fire hazard — limited effect. Localized burning or deflagration possible. Smoke and heat from burning. Low mass explosion risk under normal conditions.
CALL 911. Notify law enforcement. Isolate area; keep unauthorized personnel away. Stage upwind; eliminate ignition sources.
Structural firefighters' protective clothing may provide limited protection; positive pressure SCBA recommended
Water reactivity: May react with water depending on composition; keep dry during storage. Recommended extinguishing: Water spray, foam, dry chemical, or CO2 for small fires; use water at distance for large fires.
ERG Guide 114 recommendation: ERG 114: Isolate spill or leak area immediately for at least 50 meters in all directions; if fire or explosion occurs, isolate 800 meters in all directions
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 114 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.