UN 2258 — Propylenediamine
Placard: Corrosive. ERG Guide 132. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2258 is Propylenediamine, a flammable corrosive amine assigned to ERG Guide 132. It combines vapor fire risk with alkaline/corrosive burn hazards.
Hazard overview: FLAMMABLE and CORROSIVE amine liquid; vapors may ignite and form explosive mixtures with air. Liquid and vapor can burn eyes, skin and respiratory tissue. Vapors are heavier than air and may travel to ignition sources and flash back.
Response guidance: For a UN 2258 incident, verify the product with shipping papers, container markings, SDS and ERG Guide 132. Establish incident command, isolate the area, stay upwind, control ignition or incompatibility hazards, prevent runoff, dust or vapor spread and base entry/fire-control actions on monitoring and local SOP.
Firefighter training notes: Training for UN 2258 should emphasize vapor travel, sewer flashback, foam selection, container cooling, ignition control and runoff containment. Use ERG 132, SDS and local SOP.
Regulatory context: Propylenediamine is regulated as a hazardous material for transportation and emergency response purposes. Storage, workplace exposure, emergency planning, spill reporting, waste handling and environmental requirements vary by exact product, concentration, quantity and jurisdiction. Verify current requirements through shipping papers, SDS, container markings and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.
Storage & handling: Propylenediamine should be stored in approved flammable-liquid containers with ventilation, bonding/grounding where required, spill containment and separation from heat, ignition sources, oxidizers and incompatible materials.
UN 2258 Quick Details
Common Hazards of UN 2258
- FLAMMABLE and CORROSIVE amine liquid; vapors may ignite and form explosive mixtures with air.
- Liquid and vapor can burn eyes, skin and respiratory tissue.
- Vapors are heavier than air and may travel to ignition sources and flash back.
- Mixing with water may generate heat and spread alkaline/corrosive contamination.
- Fire may produce nitrogen oxides and irritating/toxic smoke.
- Runoff to sewers may create fire, explosion and corrosive contamination hazards.
- Containers may rupture or explode when heated.
Chemical Identity & Physical Properties
Colorless to pale yellow liquid with an ammonia-like or fishy odor. Corrosive and hygroscopic liquid at room temperature.
| Also known as | 1,2-DiaminopropanePropylenediamine1,2-PropanediamineMethylethylenediamine |
| CAS Number | 78-90-0 |
| Appearance | Colorless to pale yellow liquid with an ammonia-like or fishy odor. Corrosive and hygroscopic liquid at room temperature. |
| Flash Point | 33°C (92°F) |
| Boiling Point | 119-120°C (246-248°F) |
| Vapor Density | 2.6 (heavier than air) |
| Water Reactivity | Soluble in water; exothermic reaction generates heat but not violent |
Fireground Response Guidance — UN 2258
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for vapor, fire or confined-space exposure. Wear chemical-resistant gloves, eye/face protection, flame-resistant protection as appropriate and PPE selected from SDS.
Isolation & Evacuation
First Actions for a UN 2258 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, dust, mist, smoke or fumes and avoid skin or eye contact.
- Eliminate ignition sources if safe and keep vapors and runoff out of drains, sewers, basements and low areas.
- Do not touch damaged containers or 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 release area and expand the perimeter for fire involvement, vapor spread, dust generation, water reaction or unknown product identity.
- Use ERG Guide 132, shipping papers, SDS, air monitoring and incident command for protective actions.
📋 Copy & Share Field Card
UN 2258 — PropylenediamineUse 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.