☣️ UN 0374 • CLASS 1
Sounding devices, explosive
Placard: Explosive 1.1D. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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 0374
Class: 1
Placard type: Explosive 1.1D
ERG: Guide 112 (check current ERG)
Isolation: ERG 112: isolate 500m (1600 ft) all directions; if fire or leaking, evacuate 800m (2500 ft) downwind; mass detonation hazard requires maximum evacuation distances
Chemical & Response Details
| Also known as | explosive sounding devicesseismic explosive chargesmarine explosive soundersacoustic explosive chargesexplosive sound signal devices |
| Appearance | Solid explosive devices typically housed in metal or plastic casings, used for underwater acoustic signaling or seismic surveying. Appearance varies by manufacturer but often cylindrical or rectangular packages containing high explosives. |
| Flash Point | Not applicable (explosive solid) |
| Boiling Point | Not applicable (explosive solid) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water, but devices are designed for underwater detonation |
| Extinguishing | Do not use water or foam on fire; use dry chemical, sand, or earth from a distance |
| PPE | ⚠️ Level B minimum with structural firefighting gear; SCBA required; maintain maximum distance; explosives pose extreme fragmentation hazard |
| Isolation | ERG 112: isolate 500m (1600 ft) all directions; if fire or leaking, evacuate 800m (2500 ft) downwind; mass detonation hazard requires maximum evacuation distances |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Mass explosion hazard — entire load may detonate simultaneously.
- Severe blast overpressure and fragmentation.
- Sensitive to heat, shock, and friction.
- Secondary fire and debris hazard.
First actions (field-minded)
- CALL 911. Then call emergency response telephone number on shipping paper.
- Establish large isolation zone — minimum 500 meters in all directions.
- Stage upwind, uphill; limit personnel to essential responders only.
- Request Hazmat + law enforcement + additional resources immediately.
- Do not fight fire — evacuate and isolate; let burn if no life safety risk.
- Protect exposures only if safe and directed by command.
- Consult current ERG Guide 112 and follow SOP/SOG.
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UN 0374 — Sounding devices, explosive HAZMAT RADIO NOTE — UN 0374
Product: Sounding devices, explosive
Class 1 / Explosive 1.1D / ERG 112
PPE: Level B minimum with structural firefighting gear; SCBA required; maintain maximum distance; explosives pose extreme fragmentation hazard
ISOLATION: ERG 112: isolate 500m (1600 ft) all directions; if fire or leaking, evacuate 800m (2500 ft) downwind; mass detonation hazard requires maximum evacuation distances
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 0374 — Sounding devices, explosive
Class: 1 | Placard: Explosive 1.1D | ERG Guide: 112
Appearance: Solid explosive devices typically housed in metal or plastic casings, used for underwater acoustic signaling or seismic surveying. Appearance varies by manufacturer but often cylindrical or rectangular packages containing high explosives.
Water Reactivity: No significant reaction with water, but devices are designed for underwater detonation
Extinguishing: Do not use water or foam on fire; use dry chemical, sand, or earth from a distance
PPE: Level B minimum with structural firefighting gear; SCBA required; maintain maximum distance; explosives pose extreme fragmentation hazard
Isolation: ERG 112: isolate 500m (1600 ft) all directions; if fire or leaking, evacuate 800m (2500 ft) downwind; mass detonation hazard requires maximum evacuation distances
— Key Hazards —
• Mass explosion hazard — entire load may detonate simultaneously.
• Severe blast overpressure and fragmentation.
• Sensitive to heat, shock, and friction.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper.
• Establish large isolation zone — minimum 500 meters in all directions.
• Stage upwind, uphill; limit personnel to essential responders only.
• Request Hazmat + law enforcement + additional resources immediately.
SOURCE: allfirefighter.com/hazmat/un/0374 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0374 Sounding devices, explosive Cls1 ERG112 | allfirefighter.com/hazmat/un/0374SMS / 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/0374
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
Mass explosion hazard — entire load may detonate simultaneously. Severe blast overpressure and fragmentation. Sensitive to heat, shock, and friction. Secondary fire and debris hazard.
CALL 911. Then call emergency response telephone number on shipping paper. Establish large isolation zone — minimum 500 meters in all directions. Stage upwind, uphill; limit personnel to essential responders only.
Level B minimum with structural firefighting gear; SCBA required; maintain maximum distance; explosives pose extreme fragmentation hazard
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.