☣️ UN 3375 • CLASS 5
UN 3375 — Ammonium nitrate suspension
Placard: Oxidizer. ERG Guide 140. 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 3375 Quick Details
UN 3375
Product name: Ammonium nitrate suspension
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate spill 50m all directions; if fire isolate 800m and evacuate 1600m downwind
Common Hazards of UN 3375
- These substances will accelerate burning when involved in a fire.
- Some may decompose explosively when heated or involved in a fire.
- May explode from heat or contamination.
- Some will react explosively with hydrocarbons (fuels).
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
- Inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, burns or
Chemical Identity & Physical Properties
| Also known as | Ammonium nitrate slurryAN suspensionLiquid ammonium nitrate fertilizerAmmonium nitrate emulsion |
| Appearance | White to pale yellow liquid suspension or slurry with a faint ammonia odor. Viscous liquid at room temperature containing suspended ammonium nitrate particles. |
| Flash Point | Not applicable (non-flammable oxidizer) |
| Boiling Point | Decomposes before boiling, approximately 210C (410F) |
| Vapor Density | Not applicable (non-volatile liquid) |
| Water Reactivity | Soluble in water; no violent reaction but dilutes oxidizing properties |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3375
Extinguishing Media
Water spray, fog, or regular foam acceptable; avoid dry chemical
PPE Requirements
⚠️ Level B minimum with SCBA; face shield and chemical-resistant suit; avoid all sources of ignition and contamination
Isolation & Evacuation
ERG 140: isolate spill 50m all directions; if fire isolate 800m and evacuate 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 3375 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 in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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📋 Copy & Share Field Card
UN 3375 — Ammonium nitrate suspensionHAZMAT RADIO NOTE — UN 3375
Product: Ammonium nitrate suspension
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum with SCBA; face shield and chemical-resistant suit; avoid all sources of ignition and contamination
ISOLATION: ERG 140: isolate spill 50m all directions; if fire isolate 800m and evacuate 1600m downwind
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 3375 — Ammonium nitrate suspension
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White to pale yellow liquid suspension or slurry with a faint ammonia odor. Viscous liquid at room temperature containing suspended ammonium nitrate particles.
Water Reactivity: Soluble in water; no violent reaction but dilutes oxidizing properties
Extinguishing: Water spray, fog, or regular foam acceptable; avoid dry chemical
PPE: Level B minimum with SCBA; face shield and chemical-resistant suit; avoid all sources of ignition and contamination
Isolation: ERG 140: isolate spill 50m all directions; if fire isolate 800m and evacuate 1600m downwind
— Key Hazards —
• These substances will accelerate burning when involved in a fire.
• Some may decompose explosively when heated or involved in a fire.
• May explode from heat or contamination.
— 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/3375 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3375 Ammonium nitrate suspension Cls5 ERG140 | allfirefighter.com/hazmat/un/3375SMS / 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/3375
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Frequently Asked Questions about UN 3375
These substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire. May explode from heat or contamination. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard. Inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, burns or
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; face shield and chemical-resistant suit; avoid all sources of ignition and contamination
Water reactivity: Soluble in water; no violent reaction but dilutes oxidizing properties. Recommended extinguishing: Water spray, fog, or regular foam acceptable; avoid dry chemical.
ERG Guide 140 recommendation: ERG 140: isolate spill 50m all directions; if fire isolate 800m and evacuate 1600m downwind
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 140 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.