☣️ UN 3370 • CLASS 4
UN 3370 — Urea nitrate, wetted with not less than 10% water
Placard: Flammable Solid. 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 3370 Quick Details
UN 3370
Product name: Urea nitrate, wetted with not less than 10% water
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 113 (check current ERG)
Initial isolation: ERG 113: Isolate spill 25m (80ft) all directions. For fire: isolate 800m (0.5 miles) initially in all directions, evacuate if tank/rail car involved.
Common Hazards of UN 3370
- 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 | Urea mononitrateCarbamide nitrateNitratoureaAcidulated urea |
| CAS Number | 124-47-0 |
| Appearance | White to pale yellow crystalline solid or powder. Odorless or slight ammonia-like odor. Shipped as a wetted paste or slurry to reduce explosion hazard. |
| Flash Point | Not applicable (oxidizing solid, not combustible itself but enhances combustion) |
| Boiling Point | Not applicable (decomposes before boiling at approximately 152C/306F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; no violent reaction. Water acts as desensitizer and prevents detonation. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3370
Extinguishing Media
Water spray to keep containers cool; CO2, dry chemical for small fires. Do NOT dry out material.
PPE Requirements
⚠️ Level B minimum with SCBA required. Full protective clothing and face shield. Avoid all contact with dried material.
Isolation & Evacuation
ERG 113: Isolate spill 25m (80ft) all directions. For fire: isolate 800m (0.5 miles) initially in all directions, evacuate if tank/rail car involved.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 113).
First Actions for a UN 3370 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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📋 Copy & Share Field Card
UN 3370 — Urea nitrate, wetted with not less thanHAZMAT RADIO NOTE — UN 3370
Product: Urea nitrate, wetted with not less than 10% water
Class 4 / Flammable Solid / ERG 113
PPE: Level B minimum with SCBA required. Full protective clothing and face shield. Avoid all contact with dried material.
ISOLATION: ERG 113: Isolate spill 25m (80ft) all directions. For fire: isolate 800m (0.5 miles) initially in all directions, evacuate if tank/rail car involved.
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 3370 — Urea nitrate, wetted with not less than 10% water
Class: 4 | Placard: Flammable Solid | ERG Guide: 113
Appearance: White to pale yellow crystalline solid or powder. Odorless or slight ammonia-like odor. Shipped as a wetted paste or slurry to reduce explosion hazard.
Water Reactivity: Soluble in water; no violent reaction. Water acts as desensitizer and prevents detonation.
Extinguishing: Water spray to keep containers cool; CO2, dry chemical for small fires. Do NOT dry out material.
PPE: Level B minimum with SCBA required. Full protective clothing and face shield. Avoid all contact with dried material.
Isolation: ERG 113: Isolate spill 25m (80ft) all directions. For fire: isolate 800m (0.5 miles) initially in all directions, evacuate if tank/rail car involved.
— 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/3370 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3370 Urea nitrate, wetted with not less than 10% water Cls4 ERG113 | allfirefighter.com/hazmat/un/3370SMS / 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/3370
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Frequently Asked Questions about UN 3370
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. Full protective clothing and face shield. Avoid all contact with dried material.
Water reactivity: Soluble in water; no violent reaction. Water acts as desensitizer and prevents detonation.. Recommended extinguishing: Water spray to keep containers cool; CO2, dry chemical for small fires. Do NOT dry out material..
ERG Guide 113 recommendation: ERG 113: Isolate spill 25m (80ft) all directions. For fire: isolate 800m (0.5 miles) initially in all directions, evacuate if tank/rail car involved.
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.