☣️ UN 2924 • CLASS 3
Flammable liquid, corrosive, n.o.s.
Placard: Flammable. 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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Quick details
UN 2924
Class: 3
Placard type: Flammable
ERG: Guide 132 (check current ERG)
Isolation: ERG 132: Initial isolation 50m in all directions; spill: 150m downwind daytime, 300m nighttime; fire: 800m initial evacuation radius
Chemical & Response Details
| Also known as | Flammable corrosive liquid N.O.S.Corrosive flammable liquidFlammable liquid, corrosive, not otherwise specified |
| Appearance | Generic classification for flammable liquids with corrosive properties. Physical appearance varies by specific substance but typically liquids at room temperature that can cause tissue damage and are readily ignitable. |
| Flash Point | Below 60.5°C (141°F) per Class 3 definition |
| Boiling Point | Varies by specific substance |
| Vapor Density | Typically heavier than air (varies by substance) |
| Water Reactivity | May react with water; corrosive properties can be enhanced in aqueous solutions |
| Extinguishing | Alcohol-resistant foam preferred; dry chemical, CO2; water may react unfavorably |
| PPE | ⚠️ Level B minimum with chemical-resistant suit; SCBA required; full face protection against corrosive vapors and liquid contact |
| Isolation | ERG 132: Initial isolation 50m in all directions; spill: 150m downwind daytime, 300m nighttime; fire: 800m initial evacuation radius |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Flammable/combustible material.
- May be 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.
First actions (field-minded)
- 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.
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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UN 2924 — Flammable liquid, corrosive, n.o.s. HAZMAT RADIO NOTE — UN 2924
Product: Flammable liquid, corrosive, n.o.s.
Class 3 / Flammable / ERG 132
PPE: Level B minimum with chemical-resistant suit; SCBA required; full face protection against corrosive vapors and liquid contact
ISOLATION: ERG 132: Initial isolation 50m in all directions; spill: 150m downwind daytime, 300m nighttime; fire: 800m initial evacuation radius
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 2924 — Flammable liquid, corrosive, n.o.s.
Class: 3 | Placard: Flammable | ERG Guide: 132
Appearance: Generic classification for flammable liquids with corrosive properties. Physical appearance varies by specific substance but typically liquids at room temperature that can cause tissue damage and are readily ignitable.
Water Reactivity: May react with water; corrosive properties can be enhanced in aqueous solutions
Extinguishing: Alcohol-resistant foam preferred; dry chemical, CO2; water may react unfavorably
PPE: Level B minimum with chemical-resistant suit; SCBA required; full face protection against corrosive vapors and liquid contact
Isolation: ERG 132: Initial isolation 50m in all directions; spill: 150m downwind daytime, 300m nighttime; fire: 800m initial evacuation radius
— Key Hazards —
• Flammable/combustible material.
• May be ignited by heat, sparks or flames.
• Vapors may form explosive mixtures with air.
— 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/2924 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2924 Flammable liquid, corrosive, n.o.s. Cls3 ERG132 | allfirefighter.com/hazmat/un/2924SMS / 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/2924
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FAQ
Flammable/combustible material. May be 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.
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; full face protection against corrosive vapors and liquid contact
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 132 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.