UN 1783 — Hexamethylenediamine, solution
Placard: Corrosive. ERG Guide 153. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
Hexamethylenediamine, solution is a clear to slightly yellow aqueous solution with an amine-like, fishy odor, used in various industrial applications. It is highly alkaline and corrosive to tissue, requiring careful handling and storage.
Hazard overview: The substance is toxic and corrosive, causing severe injury or burns upon inhalation, ingestion, or skin contact, and it is also an eye irritant/lachrymator, causing flow of tears. Prolonged exposure to the substance can cause severe injury or burns.
Response guidance: In case of an emergency, isolate the spill area immediately for 25-50m in all directions and consider initial evacuation if the tank/railcar is involved in a fire. Use water spray, alcohol-resistant foam, CO2, or dry chemical to extinguish the fire, and wear a full face shield and chemical-resistant gloves to minimize exposure.
UN 1783 Quick Details
Common Hazards of UN 1783
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears).
- Contact with molten substance may cause severe burns to skin and eyes.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Combustible material: may burn but does not ignite readily.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
Chemical Identity & Physical Properties
Hexamethylenediamine, solution is a clear to slightly yellow aqueous solution with an amine-like, fishy odor, and it is highly alkaline and corrosive to tissue.
| Also known as | 1,6-Hexanediamine solutionHMDA solutionHexamethylenediamine aqueous solution1,6-Diaminohexane solution |
| CAS Number | 124-09-4 |
| Appearance | Clear to slightly yellow aqueous solution with an amine-like, fishy odor. Highly alkaline and corrosive to tissue. |
| Flash Point | Depends on concentration; typically 85-100C (185-212F) for concentrated solutions |
| Boiling Point | Approximately 100C (212F) for dilute solutions; 204-205C (399-401F) for pure amine |
| Vapor Density | Not applicable (aqueous solution, primarily water vapor) |
| Water Reactivity | Miscible with water; exothermic dissolution generates heat when concentrated |
Fireground Response Guidance — UN 1783
Extinguishing Media
PPE Requirements
When handling the substance, wear a full face shield, chemical-resistant gloves, and a self-contained breathing apparatus (SCBA) to minimize exposure and prevent skin contact, and avoid contact with the substance.
Isolation & Evacuation
First Actions for a UN 1783 Incident
- 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
📋 Copy & Share Field Card
UN 1783 — Hexamethylenediamine, solutionUse 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.