☣️ 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.
🚒☣️
⚠️ 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 3418 is 2,4-Toluylenediamine, solution, a toxic aromatic amine solution. It can be absorbed through skin and may cause serious systemic effects, so exposure control is the primary response objective.
Hazard overview: UN 3418 is highly toxic if inhaled, ingested or absorbed through skin. The solution can irritate or injure eyes and skin, and fire may produce toxic nitrogen-containing fumes. Some solvent carriers may add combustible or flammable hazards.
Response guidance: For UN 3418, isolate the release, keep personnel upwind and prevent contact with liquid or vapors. Use compatible foam, dry chemical or CO2 for fires involving solvent carriers, cool containers from a distance and contain runoff.
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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
UN 3418 is a solution of 2,4-toluylenediamine; the pure substance is a pale crystalline solid with an aromatic amine odor. The shipped liquid may be clear, yellow, tan or darker depending on solvent and concentration.
| 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.
Use SCBA with chemical-resistant suit, gloves and boots. Because skin absorption is a major concern, avoid contact with contaminated clothing and perform controlled decontamination.
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
- 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 —
• 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.
SOURCE: allfirefighter.com/hazmat/un/toluylenediamine-solution-un-3418 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3418 2,4-Toluylenediamine, solution Cls6 ERG151 | allfirefighter.com/hazmat/un/toluylenediamine-solution-un-3418SMS / 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/toluylenediamine-solution-un-3418
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Frequently Asked Questions about UN 3418
UN 3418 is 2,4-Toluylenediamine, solution. It should be identified from shipping papers, markings and the SDS before responders work near the release.
ERG Guide 151 applies to UN 3418 for initial isolation, protective actions and first-response guidance.
UN 3418 is not primarily classified as flammable, but fire may produce toxic or corrosive gases and containers may become dangerous when heated.
Use SCBA with chemical-resistant suit, gloves and boots. Because skin absorption is a major concern, avoid contact with contaminated clothing and perform controlled decontamination.
UN 3418 is highly toxic if inhaled, ingested or absorbed through skin.
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.