☣️ UN 3446 • CLASS 6
UN 3446 — Nitrotoluenes, 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 3446 Nitrotoluenes, 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 3446 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 3446 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 3446 Quick Details
UN 3446
Product name: Nitrotoluenes, solid
DOT Class: 6
Placard type: Toxic
ERG Guide: 152 (check current ERG)
Initial isolation: ERG 152: isolate spill 25m all directions; initial evacuation 50m in all directions; if tank/rail car involved in fire, isolate 800m
Common Hazards of UN 3446
- 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 3446 is described as: Yellow to brown crystalline solid with a faint aromatic odor. Exists as multiple isomers (ortho-, meta-, para-nitrotoluene).
| Also known as | MononitrotolueneMNTNitrotoluolMethylnitrobenzene |
| Appearance | Yellow to brown crystalline solid with a faint aromatic odor. Exists as multiple isomers (ortho-, meta-, para-nitrotoluene). |
| Flash Point | 106-112C (223-234F) depending on isomer |
| Boiling Point | 222-238C (432-460F) depending on isomer |
| Vapor Density | 4.7 (heavier than air) |
| Water Reactivity | No significant reaction with water; slightly soluble |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3446
Extinguishing Media
Dry chemical, CO2, alcohol-resistant foam, water spray for cooling
PPE Requirements
⚠️ Level A or B required; SCBA mandatory; full body protection due to high skin absorption risk
PPE guidance for UN 3446: Level A or B required; SCBA mandatory; full body protection due to high skin absorption risk
Isolation & Evacuation
ERG 152: isolate spill 25m all directions; initial evacuation 50m in all directions; if tank/rail car involved in fire, isolate 800m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 152).
First Actions for a UN 3446 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 3446 — Nitrotoluenes, solidHAZMAT RADIO NOTE — UN 3446
Product: Nitrotoluenes, solid
Class 6 / Toxic / ERG 152
PPE: Level A or B required; SCBA mandatory; full body protection due to high skin absorption risk
ISOLATION: ERG 152: isolate spill 25m all directions; initial evacuation 50m in all directions; if tank/rail car involved in fire, isolate 800m
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 3446 — Nitrotoluenes, solid
Class: 6 | Placard: Toxic | ERG Guide: 152
Appearance: Yellow to brown crystalline solid with a faint aromatic odor. Exists as multiple isomers (ortho-, meta-, para-nitrotoluene).
Water Reactivity: No significant reaction with water; slightly soluble
Extinguishing: Dry chemical, CO2, alcohol-resistant foam, water spray for cooling
PPE: Level A or B required; SCBA mandatory; full body protection due to high skin absorption risk
Isolation: ERG 152: isolate spill 25m all directions; initial evacuation 50m in all directions; if tank/rail car involved in fire, isolate 800m
— 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/nitrotoluenes-solid-un-3446 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3446 Nitrotoluenes, solid Cls6 ERG152 | allfirefighter.com/hazmat/un/nitrotoluenes-solid-un-3446SMS / 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/nitrotoluenes-solid-un-3446
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Frequently Asked Questions about UN 3446
UN 3446 is Nitrotoluenes, solid, a Class 6 hazardous material assigned to ERG Guide 152.
UN 3446 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; slightly soluble
Level A or B required; SCBA mandatory; full body protection due to high skin absorption risk
ERG 152: isolate spill 25m all directions; initial evacuation 50m in all directions; if tank/rail car involved in fire, isolate 800m
Dry chemical, CO2, alcohol-resistant foam, water spray for cooling
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.