UN 1203 — Motor spirit
Placard: Flammable. ERG Guide 128. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
Motor spirit, also known as gasoline or petrol, is a highly flammable liquid with a DOT class of 3. It is widely used as a fuel for vehicles and is produced on a large scale. First responders may encounter motor spirit in various scenarios, including vehicle accidents, industrial spills, and fires. The scale of production and transport of motor spirit is significant, with millions of gallons being transported every day. Motor spirit is a complex mixture of hydrocarbons with a variable boiling range, which makes it a challenging substance to handle. Its widespread use and potential for accidents make it essential for first responders to be trained in handling motor spirit emergencies.
Hazard overview: Motor spirit is highly flammable and can be easily ignited by heat, sparks, or flames, with vapors forming explosive mixtures with air. The risk of explosion and fire makes it essential to handle this substance with caution and follow proper safety protocols.
Response guidance: In case of a motor spirit spill, initially isolate the area 50m in all directions. For large spills, isolate 800m downwind, and evacuate the area if a tank or railcar is involved in a fire. Use alcohol-resistant AFFF foam, CO2, or dry chemical for suppression, but avoid using water jets. Ventilate closed spaces before entering, and use SCBA in vapor areas. Decontamination is crucial, and CHEMTREC should be contacted for guidance. It is essential to follow the isolation distances and use the correct suppression agents to prevent further accidents and minimize the risk of injury or death.
Firefighter training notes: First responders should be trained in the competency requirements for handling motor spirit emergencies, including the use of correct PPE and suppression agents. A common tactical error is using water jets for suppression, which can spread the fire and make the situation worse. ICS positions, such as the incident commander and safety officer, should be aware of the hazards and take necessary precautions to ensure a safe and effective response. Mutual aid criteria should also be established to ensure that additional resources are available if needed.
Regulatory context: Motor spirit is classified as a DOT class 3 flammable liquid. The OSHA PEL for motor spirit is not well-established, but it is considered a hazardous substance under the CERCLA list. It is essential to follow the regulations and guidelines set by the DOT and OSHA to ensure safe handling and transportation of motor spirit.
Storage & handling: Motor spirit should be stored in a well-ventilated area, away from incompatible materials such as oxidizers and ignition sources. The temperature limit for storage should not exceed 30°C (86°F), and the container should be designed to prevent leakage and spills. Regular inspections and maintenance of storage facilities are crucial to prevent accidents and ensure compliance with regulations.
UN 1203 Quick Details
Common Hazards of UN 1203
- 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
Motor spirit is a clear to pale yellow or light amber liquid with a characteristic petroleum or gasoline odor. It is highly volatile at room temperature, with a flash point of -43°C (-45°F) and a boiling point ranging from 39°C to 204°C (102°F to 399°F). The vapor pressure of motor spirit is relatively high, which contributes to its flammability and potential for vapor explosions.
| Also known as | GasolinePetrolMotor gasolineAutomotive fuelMogas |
| CAS Number | 86290-81-5 |
| Appearance | Clear to pale yellow or light amber liquid with characteristic petroleum/gasoline odor. Highly volatile at room temperature. |
| Flash Point | -43°C (-45°F) |
| Boiling Point | 39°C to 204°C (102°F to 399°F) - mixture with variable boiling range |
| Vapor Density | 3-4 (heavier than air) |
| Water Reactivity | Insoluble in water; floats and forms flammable layer on surface |
Fireground Response Guidance — UN 1203
Extinguishing Media
PPE Requirements
A minimum of Level B PPE is required for motor spirit spill response, including a chemical-resistant suit and SCBA. Avoid all ignition sources, and use splash-resistant chemical suits for spill control. The use of proper PPE is crucial to prevent skin contact and inhalation of vapors, which can cause serious health effects. It is also essential to ensure that the PPE is compatible with the substance and the environment in which it is being used.
Isolation & Evacuation
First Actions for a UN 1203 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 1203 — Motor spiritUse 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.