UN 1783 — Hexamethylenediamine, solution
Placard: Corrosive. ERG Guide 153. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 1783 is Hexamethylenediamine, solution, a corrosive alkaline amine solution assigned to ERG Guide 153. It can burn eyes, skin and respiratory tissue and may have irritating amine-like vapors.
Hazard overview: UN 1783 presents caustic liquid, amine vapor/mist, heat-on-dilution and alkaline-runoff hazards. Combustibility depends on concentration and formulation.
Response guidance: For a UN 1783 incident, responders should verify the product with shipping papers, package markings, SDS and ERG Guide 153. Establish incident command, isolate the area, stay upwind, prevent incompatible contact, control runoff and choose entry or fire-control actions based on monitoring, SDS and local SOP.
Firefighter training notes: Training for UN 1783 should emphasize corrosive exposure routes, water or oxidizer incompatibility where applicable, air monitoring, PPE selection, decontamination and runoff containment. Use ERG 153, SDS and local SOP.
Regulatory context: Hexamethylenediamine, solution is regulated as a hazardous material for transportation and emergency response purposes. Transportation, workplace exposure, spill reporting, waste handling, storage and environmental requirements may vary by concentration, formulation, quantity and jurisdiction. Verify current requirements through shipping papers, SDS, facility documents and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.
Storage & handling: Hexamethylenediamine, solution should be stored in tightly closed compatible containers in a secure, cool, dry, well-ventilated hazardous-material area according to SDS and local procedures.
UN 1783 Quick Details
Common Hazards of UN 1783
- CORROSIVE alkaline amine solution; skin, eye or respiratory contact may cause severe burns.
- Vapors or mist may have an amine-like odor and irritate the respiratory tract.
- Combustibility depends on concentration; concentrated amine solutions may burn under fire conditions.
- Dilution or mixing may generate heat and spread alkaline runoff.
- Fire may produce irritating and toxic nitrogen-containing gases.
- Runoff may be strongly alkaline and harmful to waterways.
- Containers may rupture or fail when heated.
Chemical Identity & Physical Properties
Clear to slightly yellow aqueous solution with an amine-like, fishy odor. 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
Use positive-pressure SCBA for vapor, mist, fire or confined-space exposure. Wear chemical-resistant gloves, boots, eye/face protection and protective clothing selected from SDS for corrosive liquid contact.
Isolation & Evacuation
First Actions for a UN 1783 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Avoid breathing vapors, fumes, dust, mist or spray and avoid skin or eye contact.
- Eliminate ignition sources if safe and keep vapors or runoff out of drains, sewers and low areas.
- Do not touch or walk through spilled material unless properly trained and wearing appropriate protective equipment.
- Ventilate closed spaces before entering, but only if properly trained, equipped, monitored and authorized by incident command.
- Isolate the spill or leak area and expand the perimeter if vapor, dust, fire involvement, water reaction or unknown concentration is present.
- Use ERG Guide 153, shipping papers, SDS, air monitoring and incident command for protective actions.
📋 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.