UN 2322 — Trichlorobutene
Placard: Toxic. ERG Guide 152. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2322 is Trichlorobutene, a highly toxic chlorinated liquid assigned to ERG Guide 152. Skin absorption and toxic chlorinated fire products are major concerns.
Hazard overview: HIGHLY TOXIC chlorinated liquid; may be fatal if inhaled, ingested or absorbed through skin. Combustible material: may burn but does not ignite readily. Vapors are heavier than air and may collect in low or confined areas.
Response guidance: For a UN 2322 incident, verify the product with shipping papers, container markings, SDS and ERG Guide 152. Establish incident command, isolate the area, stay upwind, control ignition or incompatibility hazards, prevent runoff, dust or vapor spread and base entry/fire-control actions on monitoring and local SOP.
Firefighter training notes: Training for UN 2322 should emphasize toxic/corrosive exposure routes, contaminated clothing, toxic fire products, decontamination waste and runoff containment. Use ERG 152, SDS and local SOP.
Regulatory context: Trichlorobutene is regulated as a hazardous material for transportation and emergency response purposes. Storage, workplace exposure, emergency planning, spill reporting, waste handling and environmental requirements vary by exact product, concentration, quantity and jurisdiction. Verify current requirements through shipping papers, SDS, container markings and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.
Storage & handling: Trichlorobutene should be stored in tightly closed compatible containers in a secure toxic/corrosive-material area with secondary containment, restricted access, ventilation and waste/decontamination planning according to SDS.
UN 2322 Quick Details
Common Hazards of UN 2322
- HIGHLY TOXIC chlorinated liquid; may be fatal if inhaled, ingested or absorbed through skin.
- Combustible material: may burn but does not ignite readily.
- Vapors are heavier than air and may collect in low or confined areas.
- May polymerize or react dangerously when heated, contaminated or involved in fire conditions.
- Fire may produce hydrogen chloride, phosgene-type gases and other toxic/corrosive smoke.
- Runoff may carry persistent toxic chlorinated contamination.
- Avoid all skin contact and contaminated clothing exposure.
Chemical Identity & Physical Properties
Colorless to pale yellow liquid with a pungent, chloroform-like odor at room temperature.
| Also known as | Trichlorobutylene1,2,3-Trichloro-2-buteneTCBTrichlorobutene isomers |
| CAS Number | 13279-87-7 |
| Appearance | Colorless to pale yellow liquid with a pungent, chloroform-like odor at room temperature. |
| Flash Point | Not available |
| Boiling Point | Approximately 160-170°C (320-338°F) |
| Vapor Density | Approximately 6.0 (heavier than air) |
| Water Reactivity | No significant reaction with water, but insoluble |
Fireground Response Guidance — UN 2322
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for vapor, dust, mist, fire or confined-space exposure. Wear chemical-resistant gloves, boots, eye/face protection and protective clothing selected from SDS; avoid all skin contact.
Isolation & Evacuation
First Actions for a UN 2322 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Avoid breathing vapors, dust, mist, smoke or fumes and avoid skin or eye contact.
- Do not touch damaged containers or spilled material unless properly trained and wearing appropriate protective equipment.
- Prevent contaminated liquid, dust, residues, runoff and decontamination waste from spreading.
- Ventilate closed spaces before entering, but only if properly trained, equipped, monitored and authorized by incident command.
- Isolate the spill or release area and expand the perimeter for fire involvement, vapor spread, dust generation, water reaction or unknown product identity.
- Use ERG Guide 152, shipping papers, SDS, air monitoring and incident command for protective actions.
📋 Copy & Share Field Card
UN 2322 — TrichlorobuteneUse 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.