☣️ UN 1843 • CLASS 6
UN 1843 — Ammonium dinitro-o-cresolate, solid
Placard: Toxic. ERG Guide 141. 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.
Ammonium dinitro-o-cresolate is a toxic substance that can accelerate burning when involved in a fire. It is a yellow to orange crystalline solid with a slight phenolic odor.
Hazard overview: These substances will accelerate burning when involved in a fire and may explode from heat or contamination. Prolonged exposure can be hazardous to health.
Response guidance: In case of an emergency, isolate the spill/leak area and evacuate immediately. Use dry chemical, sand, or CO2 to extinguish the fire, and water spray to cool containers from a distance.
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UN 1843 Quick Details
UN 1843
Product name: Ammonium dinitro-o-cresolate, solid
DOT Class: 6
Placard type: Toxic
ERG Guide: 141 (check current ERG)
Initial isolation: ERG 141: isolate spill/leak area 50m all directions; if fire involved, isolate 800m in all directions and consider evacuation for 1600m downwind
Common Hazards of UN 1843
- These substances will accelerate burning when involved in a fire.
- May explode from heat or contamination.
- Some may burn rapidly.
- 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.
- Toxic by ingestion.
Chemical Identity & Physical Properties
Ammonium dinitro-o-cresolate is a yellow to orange crystalline solid with a slight phenolic odor, stable when dry but shock-sensitive when wet or contaminated.
| Also known as | Ammonium 4,6-dinitro-o-cresolateAmmonium 2-methyl-4,6-dinitrophenolateADOCDinitro-o-cresol ammonium salt |
| CAS Number | 2980-64-5 |
| Appearance | Yellow to orange crystalline solid with a slight phenolic odor. Stable when dry but shock-sensitive when wet or contaminated. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; no violent reaction but forms toxic solution |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1843
Extinguishing Media
Dry chemical, sand, or CO2 preferred; water spray may be used to cool containers from distance
PPE Requirements
⚠️ Level B minimum with full face SCBA; Level A if concentrated or contact likely; chemical-resistant gloves and boots required
Level B minimum with full face SCBA, chemical-resistant gloves and boots are required to handle this substance.
Isolation & Evacuation
ERG 141: isolate spill/leak area 50m all directions; if fire involved, isolate 800m in all directions and consider evacuation for 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 141).
First Actions for a UN 1843 Incident
- 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 1843 — Ammonium dinitro-o-cresolate, solidHAZMAT RADIO NOTE — UN 1843
Product: Ammonium dinitro-o-cresolate, solid
Class 6 / Toxic / ERG 141
PPE: Level B minimum with full face SCBA; Level A if concentrated or contact likely; chemical-resistant gloves and boots required
ISOLATION: ERG 141: isolate spill/leak area 50m all directions; if fire involved, isolate 800m in all directions and consider evacuation for 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 1843 — Ammonium dinitro-o-cresolate, solid
Class: 6 | Placard: Toxic | ERG Guide: 141
Appearance: Yellow to orange crystalline solid with a slight phenolic odor. Stable when dry but shock-sensitive when wet or contaminated.
Water Reactivity: Soluble in water; no violent reaction but forms toxic solution
Extinguishing: Dry chemical, sand, or CO2 preferred; water spray may be used to cool containers from distance
PPE: Level B minimum with full face SCBA; Level A if concentrated or contact likely; chemical-resistant gloves and boots required
Isolation: ERG 141: isolate spill/leak area 50m all directions; if fire involved, isolate 800m in all directions and consider evacuation for 1600m downwind
— Key Hazards —
• These substances will accelerate burning when involved in a fire.
• May explode from heat or contamination.
• Some may burn rapidly.
— First Actions —
• 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
SOURCE: allfirefighter.com/hazmat/un/ammonium-dinitro-o-cresolate-un-1843 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1843 Ammonium dinitro-o-cresolate, solid Cls6 ERG141 | allfirefighter.com/hazmat/un/ammonium-dinitro-o-cresolate-un-1843SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/ammonium-dinitro-o-cresolate-un-1843
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Frequently Asked Questions about UN 1843
No, it is not flammable, but it can accelerate burning when involved in a fire.
Isolate the spill/leak area 50m in all directions.
Level B minimum with full face SCBA, chemical-resistant gloves and boots are required.
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.