☣️ UN 3379 • CLASS 3
UN 3379 — Desensitized explosive, liquid, n.o.s.
Placard: Flammable. ERG Guide 113. 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 3379 Quick Details
UN 3379
Product name: Desensitized explosive, liquid, n.o.s.
DOT Class: 3
Placard type: Flammable
ERG Guide: 113 (check current ERG)
Initial isolation: ERG 113: isolate spill 50m all directions; if fire involved, isolate 800m all directions and consider evacuation; if material is dried out, treat as explosive hazard per ERG 112 with much larger isolation distances
Common Hazards of UN 3379
- Flammable/combustible material.
- May be ignited by heat, sparks or flames.
- DRIED OUT material may explode if exposed to heat, flame, friction or shock; treat as an
- Keep material wet with water or treat as an explosive (GUIDE 112).
- Runoff to sewer may create fire or explosion hazard.
- Some are toxic and may be fatal if inhaled, ingested or absorbed through skin. Specifically,
- Contact may cause burns to skin and eyes.
- Fire may produce irritating, corrosive and/or toxic gases.
Chemical Identity & Physical Properties
| Also known as | Desensitized explosive liquidPhlegmatized explosive liquidWetted explosive liquidLiquid explosive desensitized |
| Appearance | Varies by specific compound; typically a liquid suspension or solution of explosive material in water, alcohol, or other desensitizing agent. Color and odor depend on the specific explosive compound being desensitized. |
| Flash Point | Varies by desensitizing agent and explosive compound; typically below 23C (73F) for Class 3 |
| Boiling Point | Varies depending on desensitizing solvent; evaporation may concentrate explosive component |
| Vapor Density | Varies by composition; vapors may be heavier than air depending on desensitizing agent |
| Water Reactivity | No significant reaction with water; however drying out concentrates explosive and increases hazard dramatically |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3379
Extinguishing Media
Use alcohol-resistant foam, dry chemical, or CO2; water spray may be used to keep containers cool but avoid drying out material
PPE Requirements
⚠️ Level B minimum with SCBA required; approach with extreme caution; treat dried material as high explosive requiring bomb squad/EOD response
Isolation & Evacuation
ERG 113: isolate spill 50m all directions; if fire involved, isolate 800m all directions and consider evacuation; if material is dried out, treat as explosive hazard per ERG 112 with much larger isolation distances
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 113).
First Actions for a UN 3379 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area immediately for at least 100 meters (330 feet) in all directions.
- Consider initial evacuation for 500 meters (1/3 mile) in all directions.
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UN 3379 — Desensitized explosive, liquid, n.o.s.HAZMAT RADIO NOTE — UN 3379
Product: Desensitized explosive, liquid, n.o.s.
Class 3 / Flammable / ERG 113
PPE: Level B minimum with SCBA required; approach with extreme caution; treat dried material as high explosive requiring bomb squad/EOD response
ISOLATION: ERG 113: isolate spill 50m all directions; if fire involved, isolate 800m all directions and consider evacuation; if material is dried out, treat as explosive hazard per ERG 112 with much larger isolation 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 3379 — Desensitized explosive, liquid, n.o.s.
Class: 3 | Placard: Flammable | ERG Guide: 113
Appearance: Varies by specific compound; typically a liquid suspension or solution of explosive material in water, alcohol, or other desensitizing agent. Color and odor depend on the specific explosive compound being desensitized.
Water Reactivity: No significant reaction with water; however drying out concentrates explosive and increases hazard dramatically
Extinguishing: Use alcohol-resistant foam, dry chemical, or CO2; water spray may be used to keep containers cool but avoid drying out material
PPE: Level B minimum with SCBA required; approach with extreme caution; treat dried material as high explosive requiring bomb squad/EOD response
Isolation: ERG 113: isolate spill 50m all directions; if fire involved, isolate 800m all directions and consider evacuation; if material is dried out, treat as explosive hazard per ERG 112 with much larger isolation distances
— Key Hazards —
• Flammable/combustible material.
• May be ignited by heat, sparks or flames.
• DRIED OUT material may explode if exposed to heat, flame, friction or shock; treat as an
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/3379 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3379 Desensitized explosive, liquid, n.o.s. Cls3 ERG113 | allfirefighter.com/hazmat/un/3379SMS / 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/3379
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Frequently Asked Questions about UN 3379
Flammable/combustible material. May be ignited by heat, sparks or flames. DRIED OUT material may explode if exposed to heat, flame, friction or shock; treat as an Keep material wet with water or treat as an explosive (GUIDE 112). Runoff to sewer may create fire or explosion hazard. Some are toxic and may be fatal if inhaled, ingested or absorbed through skin. Specifically, Contact may cause burns to skin and eyes. Fire may produce irritating, corrosive and/or toxic gases.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum with SCBA required; approach with extreme caution; treat dried material as high explosive requiring bomb squad/EOD response
Water reactivity: No significant reaction with water; however drying out concentrates explosive and increases hazard dramatically. Recommended extinguishing: Use alcohol-resistant foam, dry chemical, or CO2; water spray may be used to keep containers cool but avoid drying out material.
ERG Guide 113 recommendation: ERG 113: isolate spill 50m all directions; if fire involved, isolate 800m all directions and consider evacuation; if material is dried out, treat as explosive hazard per ERG 112 with much larger isolation distances
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 113 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.