☣️ UN 2290 • CLASS 6
UN 2290 — Isophorone diisocyanate
Placard: Toxic. ERG Guide 156. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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 2290 Quick Details
UN 2290
Product name: Isophorone diisocyanate
DOT Class: 6
Placard type: Toxic
ERG Guide: 156 (check current ERG)
Initial isolation: ERG 156: isolate spill 25m all directions; for large spill isolate 50m, evacuate 300m downwind if fire or major leak
Common Hazards of UN 2290
- 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 | IPDI3-Isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanateIsophoronediisocyanate1,1'-Methylenebis(4-isocyanatocyclohexane) |
| CAS Number | 4098-71-9 |
| Appearance | Colorless to light yellow liquid with a pungent, acrid odor. Combustible but does not ignite readily under normal conditions. |
| Flash Point | 175°C (347°F) |
| Boiling Point | 158°C (316°F) at 10 mmHg |
| Vapor Density | 7.3 (heavier than air) |
| Water Reactivity | Reacts with water releasing carbon dioxide gas and heat; forms polyurea; avoid direct water contact on bulk material |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2290
Extinguishing Media
Dry chemical, CO2, alcohol-resistant foam; avoid direct water streams on liquid
PPE Requirements
⚠️ Level B minimum; SCBA required; chemical-resistant suit, gloves, boots; vapors are highly irritating and toxic
Isolation & Evacuation
ERG 156: isolate spill 25m all directions; for large spill isolate 50m, evacuate 300m downwind if fire or major leak
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 156).
First Actions for a UN 2290 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 2290 — Isophorone diisocyanateHAZMAT RADIO NOTE — UN 2290
Product: Isophorone diisocyanate
Class 6 / Toxic / ERG 156
PPE: Level B minimum; SCBA required; chemical-resistant suit, gloves, boots; vapors are highly irritating and toxic
ISOLATION: ERG 156: isolate spill 25m all directions; for large spill isolate 50m, evacuate 300m downwind if fire or major leak
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 2290 — Isophorone diisocyanate
Class: 6 | Placard: Toxic | ERG Guide: 156
Appearance: Colorless to light yellow liquid with a pungent, acrid odor. Combustible but does not ignite readily under normal conditions.
Water Reactivity: Reacts with water releasing carbon dioxide gas and heat; forms polyurea; avoid direct water contact on bulk material
Extinguishing: Dry chemical, CO2, alcohol-resistant foam; avoid direct water streams on liquid
PPE: Level B minimum; SCBA required; chemical-resistant suit, gloves, boots; vapors are highly irritating and toxic
Isolation: ERG 156: isolate spill 25m all directions; for large spill isolate 50m, evacuate 300m downwind if fire or major leak
— 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/2290 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2290 Isophorone diisocyanate Cls6 ERG156 | allfirefighter.com/hazmat/un/2290SMS / 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/2290
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Frequently Asked Questions about UN 2290
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; SCBA required; chemical-resistant suit, gloves, boots; vapors are highly irritating and toxic
Water reactivity: Reacts with water releasing carbon dioxide gas and heat; forms polyurea; avoid direct water contact on bulk material. Recommended extinguishing: Dry chemical, CO2, alcohol-resistant foam; avoid direct water streams on liquid.
ERG Guide 156 recommendation: ERG 156: isolate spill 25m all directions; for large spill isolate 50m, evacuate 300m downwind if fire or major leak
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.