UN 3429 — Chlorotoluidines, liquid
Placard: Toxic. ERG Guide 153. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3429 At a Glance
UN 3429 (Chlorotoluidines, liquid) is listed as DOT Class 6 Toxic and is assigned to ERG Guide 153. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.
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.
UN 3429 Quick Details
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 |
Fireground Response Guidance — UN 3429
Extinguishing Media
PPE Requirements
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
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
📋 Copy & Share Field Card
UN 3429 — Chlorotoluidines, liquidUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.