UN 1108 — n-Amylene
Placard: Flammable. ERG Guide 128. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
n-Amylene is a colorless liquid with a gasoline-like or aromatic odor, posing significant fire and explosion hazards. It is highly volatile at room temperature and lighter than water, which can exacerbate its flammability.
Hazard overview: n-Amylene is highly flammable and can be easily ignited by heat, sparks, or flames, releasing toxic fumes. Its vapors may form explosive mixtures with air, posing a significant risk of explosion.
Response guidance: In case of an n-Amylene spill, isolate the area immediately and evacuate people downwind to prevent inhalation of toxic fumes. Emergency responders should wear Level B PPE with SCBA and avoid all ignition sources to minimize the risk of explosion.
UN 1108 Quick Details
Common Hazards of UN 1108
- HIGHLY FLAMMABLE: Will be easily 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.
- Containers may explode when heated.
Chemical Identity & Physical Properties
n-Amylene is a colorless liquid with a gasoline-like or aromatic odor, highly volatile at room temperature and lighter than water.
| Also known as | 1-PentenePropylethylenePent-1-eneAlpha-amylene |
| CAS Number | 109-67-1 |
| Appearance | Colorless liquid with a gasoline-like or aromatic odor. Lighter than water and highly volatile at room temperature. |
| Flash Point | -18C (0F) |
| Boiling Point | 30C (86F) |
| Vapor Density | 2.4 (heavier than air) |
| Water Reactivity | No significant reaction; floats on water and may spread fire |
Fireground Response Guidance — UN 1108
Extinguishing Media
PPE Requirements
When handling n-Amylene, wear Level B PPE with SCBA and avoid all ignition sources to prevent skin absorption and inhalation of toxic vapors.
Isolation & Evacuation
First Actions for a UN 1108 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 for at least 50 meters (150 feet) in all directions.
- Consider initial downwind evacuation for at least 300 meters (1000 feet).
📋 Copy & Share Field Card
UN 1108 — n-AmyleneUse 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.