☣️ UN 3447 • CLASS 6
UN 3447 — Nitroxylenes, solid
Placard: Toxic. ERG Guide 152. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ Verification required:
Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ 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.
UN 3447 Nitroxylenes, solid is assigned to ERG Guide 152. The exact risk depends on the shipment form, concentration and SDS, but responders should verify shipping papers before committing crews.
Hazard overview: Primary hazards for UN 3447 include: Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.; Contact with molten substance may cause severe burns to skin and eyes.; Avoid any skin contact. Control ignition sources, avoid direct contact and keep personnel upwind.
Response guidance: For a UN 3447 incident, isolate the area, deny entry, stay upwind and use ERG Guide 152 with the shipping papers or SDS. Use compatible extinguishing media only and prevent contaminated runoff from spreading.
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UN 3447 Quick Details
UN 3447
Product name: Nitroxylenes, solid
DOT Class: 6
Placard type: Toxic
ERG Guide: 152 (check current ERG)
Initial isolation: ERG 152: isolate spill area at least 25m in all directions; if tank/railcar involved in fire, isolate 800m in all directions and evacuate initially
Common Hazards of UN 3447
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- Contact with molten substance may cause severe burns to skin and eyes.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental contamination.
- Combustible material: may burn but does not ignite readily.
- Containers may explode when heated.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
Chemical Identity & Physical Properties
UN 3447 is described as: Yellowish to tan crystalline solid or powder at room temperature. May have a faint aromatic odor. Typically shipped as a solid mass or molten liquid.
| Also known as | Nitrated xylenesNitro-dimethylbenzenesMononitro xylenesDinitrotoluene isomers (related) |
| Appearance | Yellowish to tan crystalline solid or powder at room temperature. May have a faint aromatic odor. Typically shipped as a solid mass or molten liquid. |
| Flash Point | Not applicable (combustible solid, melts above 25C) |
| Boiling Point | Approximately 240-246C (464-475F) depending on isomer |
| Vapor Density | Not applicable (solid at room temperature) |
| Water Reactivity | No significant reaction with water; insoluble in water |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3447
Extinguishing Media
Dry chemical, CO2, water spray for cooling containers; foam may be used on molten material
PPE Requirements
⚠️ Level B minimum; SCBA required; full chemical-resistant suit to prevent any skin contact; highly toxic by all routes of exposure
PPE guidance for UN 3447: Level B minimum; SCBA required; full chemical-resistant suit to prevent any skin contact; highly toxic by all routes of exposure
Isolation & Evacuation
ERG 152: isolate spill area at least 25m in all directions; if tank/railcar involved in fire, isolate 800m in all directions and evacuate initially
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 152).
First Actions for a UN 3447 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters.
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials, increase the immediate precautionary distance in the downwind direction as conditions require.
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📋 Copy & Share Field Card
UN 3447 — Nitroxylenes, solidHAZMAT RADIO NOTE — UN 3447
Product: Nitroxylenes, solid
Class 6 / Toxic / ERG 152
PPE: Level B minimum; SCBA required; full chemical-resistant suit to prevent any skin contact; highly toxic by all routes of exposure
ISOLATION: ERG 152: isolate spill area at least 25m in all directions; if tank/railcar involved in fire, isolate 800m in all directions and evacuate initially
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 3447 — Nitroxylenes, solid
Class: 6 | Placard: Toxic | ERG Guide: 152
Appearance: Yellowish to tan crystalline solid or powder at room temperature. May have a faint aromatic odor. Typically shipped as a solid mass or molten liquid.
Water Reactivity: No significant reaction with water; insoluble in water
Extinguishing: Dry chemical, CO2, water spray for cooling containers; foam may be used on molten material
PPE: Level B minimum; SCBA required; full chemical-resistant suit to prevent any skin contact; highly toxic by all routes of exposure
Isolation: ERG 152: isolate spill area at least 25m in all directions; if tank/railcar involved in fire, isolate 800m in all directions and evacuate initially
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Contact with molten substance may cause severe burns to skin and eyes.
• Avoid any skin contact.
— First Actions —
• CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• 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/nitroxylenes-solid-un-3447 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3447 Nitroxylenes, solid Cls6 ERG152 | allfirefighter.com/hazmat/un/nitroxylenes-solid-un-3447SMS / 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/nitroxylenes-solid-un-3447
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Frequently Asked Questions about UN 3447
UN 3447 is Nitroxylenes, solid, a Class 6 hazardous material assigned to ERG Guide 152.
UN 3447 may burn or support fire depending on the product and fire conditions. Keep ignition sources away and follow ERG 152.
No significant reaction with water; insoluble in water
Level B minimum; SCBA required; full chemical-resistant suit to prevent any skin contact; highly toxic by all routes of exposure
ERG 152: isolate spill area at least 25m in all directions; if tank/railcar involved in fire, isolate 800m in all directions and evacuate initially
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.