☣️ UN 2920 • CLASS 8
UN 2920 — Corrosive liquid, flammable, n.o.s.
Placard: Corrosive. ERG Guide 132. 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 2920 Quick Details
UN 2920
Product name: Corrosive liquid, flammable, n.o.s.
DOT Class: 8
Placard type: Corrosive
ERG Guide: 132 (check current ERG)
Initial isolation: ERG 132: Small spill isolate 30m all directions; Large spill isolate 100m all directions; evacuate 800m downwind if tank/rail car involved in fire
Common Hazards of UN 2920
- 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.
Chemical Identity & Physical Properties
| Also known as | Corrosive flammable liquidFlammable corrosive solutionClass 8 flammable corrosive |
| Appearance | Variable liquid compound that is both corrosive and flammable. Physical properties (color, odor, state) depend on the specific chemical(s) shipped under this n.o.s. entry. |
| Flash Point | Below 60.5°C (141°F) - exact value depends on specific material |
| Boiling Point | Variable - depends on specific material shipped under this n.o.s. classification |
| Vapor Density | Variable - typically heavier than air, depends on specific material |
| Water Reactivity | Variable - may react with water producing heat; some formulations may react violently |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2920
Extinguishing Media
Alcohol-resistant foam preferred; dry chemical, CO2; avoid water streams due to corrosivity
PPE Requirements
⚠️ Level B minimum; SCBA required; chemical-resistant suit for corrosive protection; avoid skin/eye contact
Isolation & Evacuation
ERG 132: Small spill isolate 30m all directions; Large spill isolate 100m all directions; evacuate 800m downwind if tank/rail car involved in fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 132).
First Actions for a UN 2920 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.
- 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 2920 — Corrosive liquid, flammable, n.o.s.HAZMAT RADIO NOTE — UN 2920
Product: Corrosive liquid, flammable, n.o.s.
Class 8 / Corrosive / ERG 132
PPE: Level B minimum; SCBA required; chemical-resistant suit for corrosive protection; avoid skin/eye contact
ISOLATION: ERG 132: Small spill isolate 30m all directions; Large spill isolate 100m all directions; evacuate 800m downwind if tank/rail car 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 2920 — Corrosive liquid, flammable, n.o.s.
Class: 8 | Placard: Corrosive | ERG Guide: 132
Appearance: Variable liquid compound that is both corrosive and flammable. Physical properties (color, odor, state) depend on the specific chemical(s) shipped under this n.o.s. entry.
Water Reactivity: Variable - may react with water producing heat; some formulations may react violently
Extinguishing: Alcohol-resistant foam preferred; dry chemical, CO2; avoid water streams due to corrosivity
PPE: Level B minimum; SCBA required; chemical-resistant suit for corrosive protection; avoid skin/eye contact
Isolation: ERG 132: Small spill isolate 30m all directions; Large spill isolate 100m all directions; evacuate 800m downwind if tank/rail car involved in fire
— 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/2920 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2920 Corrosive liquid, flammable, n.o.s. Cls8 ERG132 | allfirefighter.com/hazmat/un/2920SMS / 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/2920
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Frequently Asked Questions about UN 2920
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; SCBA required; chemical-resistant suit for corrosive protection; avoid skin/eye contact
Water reactivity: Variable - may react with water producing heat; some formulations may react violently. Recommended extinguishing: Alcohol-resistant foam preferred; dry chemical, CO2; avoid water streams due to corrosivity.
ERG Guide 132 recommendation: ERG 132: Small spill isolate 30m all directions; Large spill isolate 100m all directions; evacuate 800m downwind if tank/rail car involved in fire
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.