☣️ UN 1245 • CLASS 3
UN 1245 — Methyl isobutyl ketone
Placard: Flammable. ERG Guide 127. 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 1245 Quick Details
UN 1245
Product name: Methyl isobutyl ketone
DOT Class: 3
Placard type: Flammable
ERG Guide: 127 (check current ERG)
Initial isolation: ERG 127: Small spill isolate 50m all directions; large spill isolate 150m, downwind evacuation 300m
Common Hazards of UN 1245
- 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 | MIBKHexone4-Methyl-2-pentanoneIsopropylacetone2-Methyl-4-pentanone |
| CAS Number | 108-10-1 |
| Appearance | Colorless liquid with a pleasant, sweet ketone odor. Volatile flammable solvent at room temperature. |
| Flash Point | 16°C (61°F) |
| Boiling Point | 116°C (241°F) |
| Vapor Density | 3.5 (heavier than air) |
| Water Reactivity | No significant reaction; slightly soluble in water (1.9% at 20°C) |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1245
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE Requirements
⚠️ Level B minimum in vapor area; SCBA and chemical-resistant suit for spill response; splash goggles and gloves for routine handling
Isolation & Evacuation
ERG 127: Small spill isolate 50m all directions; large spill isolate 150m, downwind evacuation 300m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 127).
First Actions for a UN 1245 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 1245 — Methyl isobutyl ketoneHAZMAT RADIO NOTE — UN 1245
Product: Methyl isobutyl ketone
Class 3 / Flammable / ERG 127
PPE: Level B minimum in vapor area; SCBA and chemical-resistant suit for spill response; splash goggles and gloves for routine handling
ISOLATION: ERG 127: Small spill isolate 50m all directions; large spill isolate 150m, downwind evacuation 300m
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 1245 — Methyl isobutyl ketone
Class: 3 | Placard: Flammable | ERG Guide: 127
Appearance: Colorless liquid with a pleasant, sweet ketone odor. Volatile flammable solvent at room temperature.
Water Reactivity: No significant reaction; slightly soluble in water (1.9% at 20°C)
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE: Level B minimum in vapor area; SCBA and chemical-resistant suit for spill response; splash goggles and gloves for routine handling
Isolation: ERG 127: Small spill isolate 50m all directions; large spill isolate 150m, downwind evacuation 300m
— 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/1245 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1245 Methyl isobutyl ketone Cls3 ERG127 | ERG 127: Small spill isolate 50m all directions; large spill isolate 150m, downw | allfirefighter.com/hazmat/un/1245SMS / 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/1245
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Frequently Asked Questions about UN 1245
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 in vapor area; SCBA and chemical-resistant suit for spill response; splash goggles and gloves for routine handling
Water reactivity: No significant reaction; slightly soluble in water (1.9% at 20°C). Recommended extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling.
ERG Guide 127 recommendation: ERG 127: Small spill isolate 50m all directions; large spill isolate 150m, downwind evacuation 300m
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 127 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.