☣️ UN 3429 • CLASS 6
UN 3429 — Chlorotoluidines, liquid
Placard: Toxic. ERG Guide 153. 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 3429 is Chlorotoluidines, liquid, a toxic aromatic amine liquid or mixture. These materials may be absorbed through skin and can produce serious health effects after direct contact or vapor exposure.
Hazard overview: UN 3429 is toxic by inhalation, ingestion and skin contact. It may irritate or burn eyes and skin, and heating or fire can generate toxic nitrogen and chlorine-containing gases. Some formulations may burn but do not ignite readily.
Response guidance: For UN 3429, isolate the area, keep responders upwind and prevent contact with liquid or vapor. Use alcohol-resistant foam, CO2 or dry chemical for fires, cool containers from a distance and contain contaminated runoff.
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UN 3429 Quick Details
UN 3429
Product name: Chlorotoluidines, liquid
DOT Class: 6
Placard type: Toxic
ERG Guide: 153 (check current ERG)
Initial isolation: ERG 153: isolate spill 50m all directions; large spill isolate 800m downwind daytime, evacuate 800m if fire or large spill
Common Hazards of UN 3429
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears).
- 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
- Combustible material: may burn but does not ignite readily.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
Chemical Identity & Physical Properties
UN 3429 is a liquid chlorinated toluidine material; color may range from pale to dark depending on isomers and impurities. It usually has an aromatic amine odor and vapor heavier than air.
| Also known as | chlorinated toluidineschloromethylanilinesaminochlorotolueneschloro-methylaniline isomers |
| Appearance | Liquid mixture of chlorinated toluidine isomers, typically pale yellow to amber colored with an aniline-like or aromatic amine odor. Combustible liquid at room temperature. |
| Flash Point | 113C (235F) typical range |
| Boiling Point | 230-245C (446-473F) depending on isomer |
| Vapor Density | 4.9 (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 3429
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE Requirements
⚠️ Level B minimum; SCBA and chemical-resistant suit required; liquid and vapor highly toxic by all routes of exposure; potential carcinogen
Use SCBA with chemical-resistant suit, gloves and boots. Because skin absorption is a concern, protect all exposed skin and decontaminate clothing and tools.
Isolation & Evacuation
ERG 153: isolate spill 50m all directions; large spill isolate 800m downwind daytime, evacuate 800m if fire or large spill
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 153).
First Actions for a UN 3429 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
- 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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📋 Copy & Share Field Card
UN 3429 — Chlorotoluidines, liquidHAZMAT RADIO NOTE — UN 3429
Product: Chlorotoluidines, liquid
Class 6 / Toxic / ERG 153
PPE: Level B minimum; SCBA and chemical-resistant suit required; liquid and vapor highly toxic by all routes of exposure; potential carcinogen
ISOLATION: ERG 153: isolate spill 50m all directions; large spill isolate 800m downwind daytime, evacuate 800m if fire or large spill
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 3429 — Chlorotoluidines, liquid
Class: 6 | Placard: Toxic | ERG Guide: 153
Appearance: Liquid mixture of chlorinated toluidine isomers, typically pale yellow to amber colored with an aniline-like or aromatic amine odor. Combustible liquid at room temperature.
Water Reactivity: No significant reaction with water; slightly soluble
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE: Level B minimum; SCBA and chemical-resistant suit required; liquid and vapor highly toxic by all routes of exposure; potential carcinogen
Isolation: ERG 153: isolate spill 50m all directions; large spill isolate 800m downwind daytime, evacuate 800m if fire or large spill
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears).
• Contact with molten substance may cause severe burns to skin and eyes.
— First Actions —
• 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
SOURCE: allfirefighter.com/hazmat/un/chlorotoluidines-liquid-un-3429 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3429 Chlorotoluidines, liquid Cls6 ERG153 | allfirefighter.com/hazmat/un/chlorotoluidines-liquid-un-3429SMS / 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/chlorotoluidines-liquid-un-3429
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Frequently Asked Questions about UN 3429
UN 3429 is Chlorotoluidines, liquid. It should be identified from shipping papers, markings and the SDS before responders work near the release.
ERG Guide 153 applies to UN 3429 for initial isolation, protective actions and first-response guidance.
UN 3429 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 concern, protect all exposed skin and decontaminate clothing and tools.
UN 3429 is toxic by inhalation, ingestion and skin contact.
For UN 3429, isolate the area, keep responders upwind and prevent contact with liquid or vapor.
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.