UN 3409 — Chloronitrobenzenes, liquid
Placard: Toxic. ERG Guide 152. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3409 is Chloronitrobenzenes, liquid, a toxic combustible chloronitrobenzene liquid assigned to ERG Guide 152. Skin absorption and toxic fire products require control.
Hazard overview: TOXIC chloronitrobenzene liquid; inhalation, ingestion or skin absorption may cause severe injury. Combustible liquid; heated vapors may form ignitable mixtures. Skin contact and contaminated clothing are major exposure concerns.
Response guidance: For UN 3409, isolate the area, avoid skin contact and use SCBA where vapor, mist, dust or fire is present. Contain toxic runoff and follow SDS/ERG 152.
Firefighter training notes: Training for UN 3409 should emphasize exposure routes, SCBA use, vapor/mist monitoring, decontamination, runoff containment and SDS verification. Use ERG 152, SDS and local SOP.
Regulatory context: Chloronitrobenzenes, liquid is regulated as a hazardous material for transport and emergency response. Storage, reporting, exposure, waste and incident-notification duties depend on quantity, concentration, formulation and jurisdiction; verify shipping papers, SDS and authority guidance.
Storage & handling: Chloronitrobenzenes, liquid should be stored in tightly closed compatible containers with ventilation, secondary containment, restricted access and SDS-based segregation from incompatible materials.
UN 3409 Quick Details
Common Hazards of UN 3409
- TOXIC chloronitrobenzene liquid; inhalation, ingestion or skin absorption may cause severe injury.
- Combustible liquid; heated vapors may form ignitable mixtures.
- Skin contact and contaminated clothing are major exposure concerns.
- Vapors are heavier than air and may collect in low or confined areas.
- Fire may produce hydrogen chloride, nitrogen oxides and toxic aromatic smoke.
- Runoff may carry toxic chlorinated/nitroaromatic contamination.
- Exact isomer mixture and physical properties must be verified from SDS.
Chemical Identity & Physical Properties
Yellow to brown oily liquid with a faint aromatic odor. Exists as various isomeric forms (ortho-, meta-, para-). Dense liquid that sinks in water.
| Also known as | ChloronitrobenzeneCNBNitrochlorobenzeneChlorinated nitrobenzene isomers |
| Appearance | Yellow to brown oily liquid with a faint aromatic odor. Exists as various isomeric forms (ortho-, meta-, para-). Dense liquid that sinks in water. |
| Flash Point | 127C (261F) typical for common isomers |
| Boiling Point | 235-245C (455-473F) depending on isomer |
| Vapor Density | 5.4-5.5 (much heavier than air) |
| Water Reactivity | No significant reaction with water, but insoluble and will sink |
Fireground Response Guidance — UN 3409
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA where vapor, mist, smoke or fire is present. Wear chemical-resistant gloves, boots, eye/face protection and protective clothing.
Isolation & Evacuation
First Actions for a UN 3409 Incident
- Call 911 and the emergency response number on the shipping paper, if available.
- Keep unauthorized personnel away and establish incident command.
- Stay upwind, uphill and upstream.
- Avoid breathing vapor, dust, mist, smoke or fumes and avoid skin or eye contact.
- Do not touch damaged containers or spilled material without proper training and PPE.
- Prevent contaminated liquid, dust, runoff and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 152, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 3409 — Chloronitrobenzenes, 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.