UN 1282 — Pyridine
Placard: Flammable. ERG Guide 129. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
Pyridine is a highly volatile liquid with a sharp, penetrating, fish-like or putrid odor. It is used in various industrial applications and can be hazardous if not handled properly.
Hazard overview: Pyridine is highly flammable and can easily ignite at room temperature. Vapors may form explosive mixtures with air.
Response guidance: In case of fire, use alcohol-resistant foam (AR-AFFF), CO2, dry chemical, or water spray for cooling. Evacuate the area and call the fire department.
UN 1282 Quick Details
Common Hazards of UN 1282
- 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
Pyridine is a colorless to pale yellow liquid with a sharp, penetrating, fish-like or putrid odor. Miscible with water and most organic solvents.
| Also known as | AzineAzabenzenePyridin |
| CAS Number | 110-86-1 |
| Appearance | Colorless to pale yellow liquid with a sharp, penetrating, fish-like or putrid odor. Miscible with water and most organic solvents. |
| Flash Point | 20°C (68°F) |
| Boiling Point | 115°C (239°F) |
| Vapor Density | 2.73 (heavier than air) |
| Water Reactivity | Miscible with water; no violent reaction but may generate heat |
Fireground Response Guidance — UN 1282
Extinguishing Media
PPE Requirements
Wear Level B minimum personal protective equipment (PPE) with SCBA and chemical-resistant suit; Level A if concentration unknown or confined space entry.
Isolation & Evacuation
First Actions for a UN 1282 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 1282 — PyridineUse 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.