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.
UN 3424 is Ammonium dinitro-o-cresolate, solution, a toxic nitroaromatic salt solution with oxidizing properties. It can accelerate burning and may become more dangerous when heated or contaminated.
Hazard overview: UN 3424 is toxic by ingestion and exposure, and it can intensify fire involving combustible materials. Heat or contamination may cause rapid decomposition or explosion hazard, while runoff can spread toxic contamination.
Response guidance: For UN 3424, isolate the area, keep combustibles and fuels away and prevent runoff from entering drains. Use water spray, fog or foam as directed by ERG 141 and cool containers from a distance if fire threatens them.
UN 3424 Quick Details
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
UN 3424 is usually a yellow to orange liquid solution with a slight phenolic odor. It is denser than water and dissolves or disperses in water, creating toxic runoff.
| 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 |
Fireground Response Guidance — UN 3424
Extinguishing Media
PPE Requirements
Use SCBA with chemical-resistant protective clothing and gloves. Level B is a minimum for significant spills or fire involvement; avoid skin contact and contaminated runoff.
Isolation & Evacuation
First Actions for a UN 3424 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).
📋 Copy & Share Field Card
UN 3424 — Ammonium dinitro-o-cresolate, solutionUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.