☣️ UN 2206 • CLASS 6
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.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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UN 2206 Quick Details
UN 2206
Product name: Isocyanate solution, poisonous, n.o.s.
DOT Class: 6
Placard type: Toxic
ERG Guide: 156 (check current ERG)
Initial isolation: ERG 156: Initial isolation 100m in all directions; protective action distance 800m downwind for large spills
Common Hazards of UN 2206
- Combustible material: may burn but does not ignite readily.
- Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
- Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
- Vapors may travel to source of ignition and flash back.
- Corrosives in contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated or if contaminated with water.
- TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
Chemical Identity & Physical Properties
| 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. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2206
Extinguishing Media
Dry chemical, CO2, or foam if alcohol-resistant; avoid water streams directly on material
PPE Requirements
⚠️ Level B minimum with SCBA required; full face protection; chemical-resistant suit due to high toxicity and skin/eye hazard
Isolation & Evacuation
ERG 156: Initial isolation 100m in all directions; protective action distance 800m downwind for large spills
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 156).
First Actions for a UN 2206 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- 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
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📋 Copy & Share Field Card
UN 2206 — Isocyanate solution, poisonous, n.o.s.HAZMAT RADIO NOTE — UN 2206
Product: Isocyanate solution, poisonous, n.o.s.
Class 6 / Toxic / ERG 156
PPE: Level B minimum with SCBA required; full face protection; chemical-resistant suit due to high toxicity and skin/eye hazard
ISOLATION: ERG 156: Initial isolation 100m in all directions; protective action distance 800m downwind for large spills
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 2206 — Isocyanate solution, poisonous, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 156
Appearance: Colorless to yellow liquid with a pungent, acrid odor. May be viscous depending on specific formulation.
Water Reactivity: Reacts with water releasing toxic gases and heat; may be violent. Avoid water contact.
Extinguishing: Dry chemical, CO2, or foam if alcohol-resistant; avoid water streams directly on material
PPE: Level B minimum with SCBA required; full face protection; chemical-resistant suit due to high toxicity and skin/eye hazard
Isolation: ERG 156: Initial isolation 100m in all directions; protective action distance 800m downwind for large spills
— Key Hazards —
• Combustible material: may burn but does not ignite readily.
• Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
• When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/2206 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2206 Isocyanate solution, poisonous, n.o.s. Cls6 ERG156 | allfirefighter.com/hazmat/un/2206SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/2206
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Frequently Asked Questions about UN 2206
Combustible material: may burn but does not ignite readily. Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff. When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas Vapors may travel to source of ignition and flash back. Corrosives in contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water. TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum with SCBA required; full face protection; chemical-resistant suit due to high toxicity and skin/eye hazard
Water reactivity: Reacts with water releasing toxic gases and heat; may be violent. Avoid water contact.. Recommended extinguishing: Dry chemical, CO2, or foam if alcohol-resistant; avoid water streams directly on material.
ERG Guide 156 recommendation: ERG 156: Initial isolation 100m in all directions; protective action distance 800m downwind for large spills
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 156 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.