UN 3409 — Chloronitrobenzenes, liquid
Placard: Toxic. ERG Guide 152. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3409 At a Glance
UN 3409 (Chloronitrobenzenes, liquid) is listed as DOT Class 6 Toxic and is assigned to ERG Guide 152. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.
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.