☣️ UN 3424 • CLASS 6
UN 3424 — Ammonium dinitro-o-cresolate, solution
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.
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UN 3424 Quick Details
UN 3424
Product name: Ammonium dinitro-o-cresolate, solution
DOT Class: 6
Placard type: Toxic
ERG Guide: 141 (check current ERG)
Initial isolation: ERG 141: isolate spill 25m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
Common Hazards of UN 3424
- 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
| Also known as | ADOC solutionAmmonium 4,6-dinitro-o-cresolateDinitro-o-cresol ammonium salt solutionDNOC ammonium salt |
| CAS Number | 1945-77-3 |
| Appearance | Yellow to orange liquid solution with a slight phenolic odor. Density greater than water. |
| Flash Point | Not applicable (aqueous solution, non-flammable) |
| Boiling Point | Approximately 100C (212F) for aqueous solutions |
| Vapor Density | Not applicable (aqueous solution) |
| Water Reactivity | Soluble in water; no violent reaction but may contaminate water sources |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3424
Extinguishing Media
Water spray, fog, or foam acceptable for firefighting
PPE Requirements
⚠️ Level B minimum; SCBA required; chemical-resistant suit due to toxicity
Isolation & Evacuation
ERG 141: isolate spill 25m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 141).
First Actions for a UN 3424 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 3424 — Ammonium dinitro-o-cresolate, solutionHAZMAT RADIO NOTE — UN 3424
Product: Ammonium dinitro-o-cresolate, solution
Class 6 / Toxic / ERG 141
PPE: Level B minimum; SCBA required; chemical-resistant suit due to toxicity
ISOLATION: ERG 141: isolate spill 25m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
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 3424 — Ammonium dinitro-o-cresolate, solution
Class: 6 | Placard: Toxic | ERG Guide: 141
Appearance: Yellow to orange liquid solution with a slight phenolic odor. Density greater than water.
Water Reactivity: Soluble in water; no violent reaction but may contaminate water sources
Extinguishing: Water spray, fog, or foam acceptable for firefighting
PPE: Level B minimum; SCBA required; chemical-resistant suit due to toxicity
Isolation: ERG 141: isolate spill 25m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
— Key Hazards —
• These substances will accelerate burning when involved in a fire.
• May explode from heat or contamination.
• Some may burn rapidly.
— 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/3424 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3424 Ammonium dinitro-o-cresolate, solution Cls6 ERG141 | allfirefighter.com/hazmat/un/3424SMS / 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/3424
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Frequently Asked Questions about UN 3424
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.
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; SCBA required; chemical-resistant suit due to toxicity
Water reactivity: Soluble in water; no violent reaction but may contaminate water sources. Recommended extinguishing: Water spray, fog, or foam acceptable for firefighting.
ERG Guide 141 recommendation: ERG 141: isolate spill 25m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 141 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.