☣️ UN 2493 • CLASS 3
UN 2493 — Hexamethyleneimine
Placard: Flammable. ERG Guide 132. 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 2493 Quick Details
UN 2493
Product name: Hexamethyleneimine
DOT Class: 3
Placard type: Flammable
ERG Guide: 132 (check current ERG)
Initial isolation: ERG 132: Initially isolate 50m in all directions; for large spills consider evacuation 300m downwind; if tank/rail car involved in fire, isolate 800m
Common Hazards of UN 2493
- Flammable/combustible material.
- May be 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.
Chemical Identity & Physical Properties
| Also known as | HexahydroazepinePerhydroazepineAzacycloheptaneHomopiperidine |
| CAS Number | 111-49-9 |
| Appearance | Colorless to pale yellow liquid with an amine-like, fishy odor. Flammable liquid at room temperature. |
| Flash Point | 18°C (64°F) |
| Boiling Point | 138°C (280°F) |
| Vapor Density | 3.4 (heavier than air) |
| Water Reactivity | Reacts slowly with water, releasing heat; miscible but may cause exothermic reaction |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2493
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical; avoid water streams that spread fire
PPE Requirements
⚠️ Level B minimum with SCBA; full face protection required; chemical-resistant gloves and clothing due to corrosive amine properties
Isolation & Evacuation
ERG 132: Initially isolate 50m in all directions; for large spills consider evacuation 300m downwind; if tank/rail car involved in fire, isolate 800m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 132).
First Actions for a UN 2493 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.
- 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 2493 — HexamethyleneimineHAZMAT RADIO NOTE — UN 2493
Product: Hexamethyleneimine
Class 3 / Flammable / ERG 132
PPE: Level B minimum with SCBA; full face protection required; chemical-resistant gloves and clothing due to corrosive amine properties
ISOLATION: ERG 132: Initially isolate 50m in all directions; for large spills consider evacuation 300m downwind; if tank/rail car involved in fire, isolate 800m
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 2493 — Hexamethyleneimine
Class: 3 | Placard: Flammable | ERG Guide: 132
Appearance: Colorless to pale yellow liquid with an amine-like, fishy odor. Flammable liquid at room temperature.
Water Reactivity: Reacts slowly with water, releasing heat; miscible but may cause exothermic reaction
Extinguishing: Alcohol-resistant foam, CO2, dry chemical; avoid water streams that spread fire
PPE: Level B minimum with SCBA; full face protection required; chemical-resistant gloves and clothing due to corrosive amine properties
Isolation: ERG 132: Initially isolate 50m in all directions; for large spills consider evacuation 300m downwind; if tank/rail car involved in fire, isolate 800m
— Key Hazards —
• Flammable/combustible material.
• May be ignited by heat, sparks or flames.
• Vapors may form explosive mixtures with air.
— 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/2493 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2493 Hexamethyleneimine Cls3 ERG132 | ERG 132: Initially isolate 50m in all directions; for large spills consider evac | allfirefighter.com/hazmat/un/2493SMS / 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/2493
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Frequently Asked Questions about UN 2493
Flammable/combustible material. May be 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.
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; full face protection required; chemical-resistant gloves and clothing due to corrosive amine properties
Water reactivity: Reacts slowly with water, releasing heat; miscible but may cause exothermic reaction. Recommended extinguishing: Alcohol-resistant foam, CO2, dry chemical; avoid water streams that spread fire.
ERG Guide 132 recommendation: ERG 132: Initially isolate 50m in all directions; for large spills consider evacuation 300m downwind; if tank/rail car involved in fire, isolate 800m
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 132 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.