☣️ UN 1203 • CLASS 3
UN 1203 — Motor spirit
Placard: Flammable. ERG Guide 128. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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UN 1203 Quick Details
UN 1203
Product name: Motor spirit
DOT Class: 3
Placard type: Flammable
ERG Guide: 128 (check current ERG)
Initial isolation: ERG 128: Initially isolate 50m in all directions; for large spill isolate 800m downwind; evacuate area if tank/railcar is involved in fire
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
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1203
Extinguishing Media
Alcohol-resistant AFFF foam, CO2, dry chemical, foam - NO water jets
PPE Requirements
⚠️ Level B minimum with chemical-resistant suit; SCBA required in vapor area; avoid all ignition sources
Isolation & Evacuation
ERG 128: Initially isolate 50m in all directions; for large spill isolate 800m downwind; evacuate area if tank/railcar is involved in fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 128).
First Actions for a UN 1203 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- 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).
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📋 Copy & Share Field Card
UN 1203 — Motor spiritHAZMAT RADIO NOTE — UN 1203
Product: Motor spirit
Class 3 / Flammable / ERG 128
PPE: Level B minimum with chemical-resistant suit; SCBA required in vapor area; avoid all ignition sources
ISOLATION: ERG 128: Initially isolate 50m in all directions; for large spill isolate 800m downwind; evacuate area if tank/railcar is involved in fire
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 1203 — Motor spirit
Class: 3 | Placard: Flammable | ERG Guide: 128
Appearance: Clear to pale yellow or light amber liquid with characteristic petroleum/gasoline odor. Highly volatile at room temperature.
Water Reactivity: Insoluble in water; floats and forms flammable layer on surface
Extinguishing: Alcohol-resistant AFFF foam, CO2, dry chemical, foam - NO water jets
PPE: Level B minimum with chemical-resistant suit; SCBA required in vapor area; avoid all ignition sources
Isolation: ERG 128: Initially isolate 50m in all directions; for large spill isolate 800m downwind; evacuate area if tank/railcar is involved in fire
— Key Hazards —
• 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.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/1203 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1203 Motor spirit Cls3 ERG128 | ERG 128: Initially isolate 50m in all directions; for large spill isolate 800m d | allfirefighter.com/hazmat/un/1203SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/1203
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Frequently Asked Questions about 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.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum with chemical-resistant suit; SCBA required in vapor area; avoid all ignition sources
Water reactivity: Insoluble in water; floats and forms flammable layer on surface. Recommended extinguishing: Alcohol-resistant AFFF foam, CO2, dry chemical, foam - NO water jets.
ERG Guide 128 recommendation: ERG 128: Initially isolate 50m in all directions; for large spill isolate 800m downwind; evacuate area if tank/railcar is involved in fire
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 128 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.