☣️ UN 3418 • CLASS 6
UN 3418 — 2,4-Toluylenediamine, solution
Placard: Toxic. ERG Guide 151. 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 3418 Quick Details
UN 3418
Product name: 2,4-Toluylenediamine, solution
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: Isolate spill or leak area immediately for at least 50m in all directions. Initial isolation 100m, protective action distance 300m for small spills, up to 2000m downwind for large spills.
Common Hazards of UN 3418
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- 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
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- Containers may explode when heated.
- Runoff may pollute waterways.
Chemical Identity & Physical Properties
| Also known as | 2,4-DiaminotolueneToluene-2,4-diamine2,4-TDA4-Methyl-m-phenylenediaminem-Tolylenediamine |
| CAS Number | 95-80-7 |
| Appearance | Colorless to pale yellow or tan crystalline solid when pure, typically dissolved in solution. Slight to mild aromatic amine odor. Solution may be various colors depending on solvent and concentration. |
| Flash Point | 156C (313F) for pure substance; varies with solvent in solution form |
| Boiling Point | 280-292C (536-558F) with decomposition; solution boiling point depends on solvent |
| Vapor Density | 4.2 (heavier than air) for pure substance; solution vapor density varies with solvent |
| Water Reactivity | No significant reaction with water, but dissolves slightly. Toxic to aquatic organisms. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3418
Extinguishing Media
Alcohol-resistant foam, dry chemical, CO2. Water spray may be used to cool containers and disperse vapors.
PPE Requirements
⚠️ Level A or B required due to high toxicity. Full chemical-resistant suit, butyl rubber gloves, SCBA mandatory. Avoid all skin contact - absorbs readily through skin causing poisoning.
Isolation & Evacuation
ERG 151: Isolate spill or leak area immediately for at least 50m in all directions. Initial isolation 100m, protective action distance 300m for small spills, up to 2000m downwind for large spills.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 3418 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.
- 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 measure distance, in the downwind
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UN 3418 — 2,4-Toluylenediamine, solutionHAZMAT RADIO NOTE — UN 3418
Product: 2,4-Toluylenediamine, solution
Class 6 / Toxic / ERG 151
PPE: Level A or B required due to high toxicity. Full chemical-resistant suit, butyl rubber gloves, SCBA mandatory. Avoid all skin contact - absorbs readily through skin causing poisoning.
ISOLATION: ERG 151: Isolate spill or leak area immediately for at least 50m in all directions. Initial isolation 100m, protective action distance 300m for small spills, up to 2000m downwind for large spills.
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 3418 — 2,4-Toluylenediamine, solution
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Colorless to pale yellow or tan crystalline solid when pure, typically dissolved in solution. Slight to mild aromatic amine odor. Solution may be various colors depending on solvent and concentration.
Water Reactivity: No significant reaction with water, but dissolves slightly. Toxic to aquatic organisms.
Extinguishing: Alcohol-resistant foam, dry chemical, CO2. Water spray may be used to cool containers and disperse vapors.
PPE: Level A or B required due to high toxicity. Full chemical-resistant suit, butyl rubber gloves, SCBA mandatory. Avoid all skin contact - absorbs readily through skin causing poisoning.
Isolation: ERG 151: Isolate spill or leak area immediately for at least 50m in all directions. Initial isolation 100m, protective action distance 300m for small spills, up to 2000m downwind for large spills.
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Avoid any skin contact.
• Fire may produce irritating, corrosive and/or toxic gases.
— 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.
• 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/3418 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3418 2,4-Toluylenediamine, solution Cls6 ERG151 | allfirefighter.com/hazmat/un/3418SMS / 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/3418
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Frequently Asked Questions about UN 3418
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. 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 Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive Containers may explode when heated. Runoff may pollute waterways.
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 A or B required due to high toxicity. Full chemical-resistant suit, butyl rubber gloves, SCBA mandatory. Avoid all skin contact - absorbs readily through skin causing poisoning.
Water reactivity: No significant reaction with water, but dissolves slightly. Toxic to aquatic organisms.. Recommended extinguishing: Alcohol-resistant foam, dry chemical, CO2. Water spray may be used to cool containers and disperse vapors..
ERG Guide 151 recommendation: ERG 151: Isolate spill or leak area immediately for at least 50m in all directions. Initial isolation 100m, protective action distance 300m for small spills, up to 2000m downwind for large spills.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 151 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.