☣️ UN 2390 • CLASS 3
UN 2390 — 2-Iodobutane
Placard: Flammable. ERG Guide 129. 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.
Advertisement
UN 2390 Quick Details
UN 2390
Product name: 2-Iodobutane
DOT Class: 3
Placard type: Flammable
ERG Guide: 129 (check current ERG)
Initial isolation: ERG 129: Small spill isolate 30m all directions; large spill isolate 150m all directions, evacuate 800m downwind if fire/major spill
Common Hazards of UN 2390
- HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
- Vapors may form explosive mixtures with air.
- Vapors may travel to source of ignition and flash back.
- Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
- Vapor explosion hazard indoors, outdoors or in sewers.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Runoff to sewer may create fire or explosion hazard.
- Containers may explode when heated.
Chemical Identity & Physical Properties
| Also known as | sec-Butyl iodideIodobutane2-Iodobutanesec-IodobutaneButane, 2-iodo- |
| CAS Number | 513-48-4 |
| Appearance | Colorless to pale yellow liquid with a characteristic pungent odor. Liquid at room temperature, denser than water. |
| Flash Point | Not available (estimated below 23°C/73°F based on Class 3 classification) |
| Boiling Point | 119-120°C (246-248°F) |
| Vapor Density | 6.4 (heavier than air) |
| Water Reactivity | Immiscible with water; may slowly decompose in water but no violent reaction expected |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2390
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE Requirements
⚠️ Level B minimum with SCBA; chemical-resistant gloves and clothing required due to flammable vapors and potential skin irritation
Isolation & Evacuation
ERG 129: Small spill isolate 30m all directions; large spill isolate 150m all directions, evacuate 800m downwind if fire/major spill
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 129).
First Actions for a UN 2390 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 for at least 50 meters (150 feet) in all directions.
- Consider initial downwind evacuation for at least 300 meters (1000 feet).
Advertisement
📋 Copy & Share Field Card
UN 2390 — 2-IodobutaneHAZMAT RADIO NOTE — UN 2390
Product: 2-Iodobutane
Class 3 / Flammable / ERG 129
PPE: Level B minimum with SCBA; chemical-resistant gloves and clothing required due to flammable vapors and potential skin irritation
ISOLATION: ERG 129: Small spill isolate 30m all directions; large spill isolate 150m all directions, evacuate 800m downwind if fire/major spill
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 2390 — 2-Iodobutane
Class: 3 | Placard: Flammable | ERG Guide: 129
Appearance: Colorless to pale yellow liquid with a characteristic pungent odor. Liquid at room temperature, denser than water.
Water Reactivity: Immiscible with water; may slowly decompose in water but no violent reaction expected
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE: Level B minimum with SCBA; chemical-resistant gloves and clothing required due to flammable vapors and potential skin irritation
Isolation: ERG 129: Small spill isolate 30m all directions; large spill isolate 150m all directions, evacuate 800m downwind if fire/major spill
— Key Hazards —
• HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
• Vapors may form explosive mixtures with air.
• Vapors may travel to source of ignition and flash back.
— 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/2390 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2390 2-Iodobutane Cls3 ERG129 | ERG 129: Small spill isolate 30m all directions; large spill isolate 150m all di | allfirefighter.com/hazmat/un/2390SMS / 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/2390
Advertisement
Frequently Asked Questions about UN 2390
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas Vapor explosion hazard indoors, outdoors or in sewers. Those substances designated with a (P) may polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated.
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; chemical-resistant gloves and clothing required due to flammable vapors and potential skin irritation
Water reactivity: Immiscible with water; may slowly decompose in water but no violent reaction expected. Recommended extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling.
ERG Guide 129 recommendation: ERG 129: Small spill isolate 30m all directions; large spill isolate 150m all directions, evacuate 800m downwind if fire/major spill
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 129 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.