UN 1134 — Chlorobenzene
Placard: Flammable. ERG Guide 130. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
Chlorobenzene is a clear, colorless liquid with a characteristic almond-like odor, commonly used in various industrial applications. It is essential to handle this substance with care due to its highly flammable nature.
Hazard overview: Chlorobenzene is highly flammable and can be easily ignited by heat, sparks, or flames, forming explosive mixtures with air. Prolonged exposure to its vapors can be hazardous to human health.
Response guidance: In case of a spill, evacuate the area immediately and use alcohol-resistant foam, CO2, or dry chemical to extinguish the fire. Wear a self-contained breathing apparatus and a chemical-resistant suit to minimize exposure.
UN 1134 Quick Details
Common Hazards of UN 1134
- 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
Chlorobenzene is a clear, colorless liquid with moderate volatility and a characteristic almond-like odor.
| Also known as | monochlorobenzenephenyl chloridebenzene chlorideMCB |
| CAS Number | 108-90-7 |
| Appearance | Clear, colorless liquid with a characteristic almond-like odor. Liquid at room temperature with moderate volatility. |
| Flash Point | 29°C (84°F) |
| Boiling Point | 132°C (270°F) |
| Vapor Density | 3.9 (heavier than air) |
| Water Reactivity | Insoluble in water; no significant reaction with water |
Fireground Response Guidance — UN 1134
Extinguishing Media
PPE Requirements
A Level B minimum personal protective equipment, including a self-contained breathing apparatus and a chemical-resistant suit, is required when handling chlorobenzene.
Isolation & Evacuation
First Actions for a UN 1134 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 1134 — ChlorobenzeneUse 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.