UN 2206 — Isocyanate solution, poisonous, n.o.s.
Placard: Toxic. ERG Guide 156. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2206 is Isocyanate solution, poisonous, n.o.s., a toxic isocyanate solution assigned to ERG Guide 156. Inhalation can cause respiratory sensitization and water reaction can build pressure.
Hazard overview: TOXIC isocyanate solution; inhalation of vapor or aerosol may cause severe respiratory sensitization and injury. Combustible material: may burn but does not ignite readily. Reacts with water to release carbon dioxide and heat; pressure buildup may occur in closed containers.
Response guidance: For a UN 2206 incident, verify the product with shipping papers, container markings, SDS and ERG Guide 156. Establish incident command, isolate the area, stay upwind, control ignition or incompatibility hazards, prevent runoff or vapor spread and base entry/fire-control actions on monitoring and local SOP.
Firefighter training notes: Training for UN 2206 should emphasize exposure routes, air monitoring, PPE selection, fire behavior, decontamination, runoff containment and ERG/SDS verification. Use ERG 156, SDS and local SOP.
Regulatory context: Isocyanate solution, poisonous, n.o.s. 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: Isocyanate solution, poisonous, n.o.s. should be stored in tightly closed compatible containers in a secure, ventilated toxic-material area with secondary containment, restricted access and segregation from incompatible chemicals according to SDS.
UN 2206 Quick Details
Common Hazards of UN 2206
- TOXIC isocyanate solution; inhalation of vapor or aerosol may cause severe respiratory sensitization and injury.
- Combustible material: may burn but does not ignite readily.
- Reacts with water to release carbon dioxide and heat; pressure buildup may occur in closed containers.
- Skin and eye contact may cause irritation, burns or sensitization.
- Vapors may collect in low or confined areas depending on solvent/formulation.
- Fire may produce nitrogen oxides, isocyanate vapors, hydrogen cyanide-type products and other toxic gases.
- Runoff may spread toxic isocyanate contamination.
Chemical Identity & Physical Properties
Colorless to yellow liquid with a pungent, acrid odor. May be viscous depending on specific formulation.
| Also known as | Isocyanate mixtureToxic isocyanate solutionIsocyanate preparationN.O.S. isocyanate liquid |
| Appearance | Colorless to yellow liquid with a pungent, acrid odor. May be viscous depending on specific formulation. |
| Flash Point | Varies by formulation, typically 38-93C (100-200F), combustible |
| Boiling Point | Varies by formulation, typically 100-250C (212-482F) |
| Vapor Density | Greater than 1 (heavier than air) |
| Water Reactivity | Reacts with water releasing toxic gases and heat; may be violent. Avoid water contact. |
Fireground Response Guidance — UN 2206
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for vapor, dust, mist, fire or confined-space exposure. Wear chemical-resistant gloves, eye/face protection and protective clothing selected from SDS; avoid skin contact.
Isolation & Evacuation
First Actions for a UN 2206 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 gas, vapor, dust, mist, smoke or fumes and avoid skin or eye contact.
- Do not touch damaged containers or spilled/released material unless properly trained and wearing appropriate protective equipment.
- 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/gas spread, cylinder heating, oxidizer reaction or unknown product identity.
- Use ERG Guide 156, shipping papers, SDS, air monitoring and incident command for protective actions.
📋 Copy & Share Field Card
UN 2206 — Isocyanate solution, poisonous, n.o.s.Use 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.