UN 0374 — Sounding devices, explosive

=== 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

UN0374 Sounding devices, explosive Cls1 ERG112 | allfirefighter.com/hazmat/un/0374SMS / 160 CHAR