UN 1125 — n-Butylamine
Placard: Flammable. ERG Guide 132. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 1125 is n-Butylamine, a Class 3 flammable amine liquid assigned to ERG Guide 132. It combines flammable vapor behavior with irritating or corrosive amine exposure hazards.
Hazard overview: UN 1125 presents flammable vapor, flashback and corrosive/irritating vapor hazards. Vapors can collect in low areas and ignite, while liquid or vapor contact can injure eyes, skin and respiratory tissue.
Response guidance: For a UN 1125 incident, responders should confirm the product using shipping papers, container markings, SDS and ERG Guide 132. Establish incident command, isolate the area, stay upwind and uphill, remove ignition sources when safe, keep vapors out of sewers and use compatible Class B fire-control agents from a protected position.
Firefighter training notes: Training for UN 1125 should emphasize amine irritation/corrosivity, flammable vapor travel, sewer entry prevention and PPE selection. Common errors include using fire-only PPE for chemical exposure and ignoring alkaline/corrosive runoff. Use ERG 132, SDS and local SOP.
Regulatory context: n-Butylamine 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 product, 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: n-Butylamine should be stored in compatible flammable-liquid containers in a cool, dry, well-ventilated area away from heat, ignition sources, acids, oxidizers and incompatible materials. Use secondary containment and protect containers from corrosion, impact and drain pathways.
UN 1125 Quick Details
Common Hazards of UN 1125
- FLAMMABLE liquid; may be ignited by heat, sparks or flames.
- Vapors may form explosive mixtures with air and flash back to the source.
- Vapors are heavier than air and may collect in low or confined areas.
- Amine vapors or liquid may be irritating or corrosive to eyes, skin and respiratory tissue.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff to sewer may create fire, explosion or environmental hazards.
- Containers may rupture or explode when heated.
Chemical Identity & Physical Properties
Colorless to pale yellow liquid with a strong ammonia-like or fishy odor. Highly volatile at room temperature.
| Also known as | 1-butanaminebutylaminemono-n-butylamine1-aminobutanenorvalamine |
| CAS Number | 109-73-9 |
| Appearance | Colorless to pale yellow liquid with a strong ammonia-like or fishy odor. Highly volatile at room temperature. |
| Flash Point | -12°C (10°F) |
| Boiling Point | 78°C (172°F) |
| Vapor Density | 2.5 (heavier than air) |
| Water Reactivity | Soluble in water, moderate exothermic reaction with water releasing heat |
Fireground Response Guidance — UN 1125
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for vapor, fire or confined-space exposure. Chemical-resistant gloves, eye/face protection and protective clothing are important because amine liquids and vapors can irritate or burn tissue.
Isolation & Evacuation
First Actions for a UN 1125 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.
- Eliminate ignition sources if it is safe to do so.
- Do not touch or walk through spilled liquid unless properly trained and wearing appropriate protective equipment.
- Avoid breathing vapors and avoid skin or eye contact with liquid.
- Ventilate closed spaces before entering, but only if properly trained, equipped and authorized by incident command.
- Isolate the spill or leak area for at least 50 meters (150 feet) in all directions.
- For large spills or fire involvement, expand isolation and consider downwind evacuation based on vapor movement, monitoring and incident command.
- Use ERG Guide 132, shipping papers, SDS and local SOP for protective actions and entry decisions.
📋 Copy & Share Field Card
UN 1125 — n-ButylamineUse 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.