☣️ UN 2794 • CLASS 8
UN 2794 — Batteries, wet, filled with acid
Placard: Corrosive. ERG Guide 154. 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 2794 Quick Details
UN 2794
Product name: Batteries, wet, filled with acid
DOT Class: 8
Placard type: Corrosive
ERG Guide: 154 (check current ERG)
Initial isolation: ERG 154: isolate spill area immediate vicinity; if leaking electrolyte, protect with acid-resistant equipment; ventilate enclosed areas
Common Hazards of UN 2794
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Contact with molten substance may cause severe burns to skin and eyes.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.).
- Corrosives in contact with metals may evolve flammable hydrogen gas.
Chemical Identity & Physical Properties
| Also known as | Lead-acid batteriesStorage batteries wetElectric storage batteriesAutomotive batteries filledBattery acid filled |
| Appearance | Batteries containing liquid sulfuric acid electrolyte solution, typically lead-acid type. Electrolyte is colorless to slightly yellowish corrosive liquid. Batteries are heavy, solid units with internal lead plates. |
| Flash Point | Not applicable (non-flammable device, though hydrogen gas may be generated during charging) |
| Boiling Point | Not applicable (electrolyte boils at approximately 338C/640F) |
| Vapor Density | Not applicable (contained liquid electrolyte) |
| Water Reactivity | Dilution with water generates heat; acid is miscible with water but addition should be controlled |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2794
Extinguishing Media
Not typically required; water spray for external cooling only, avoid direct contact with battery acid
PPE Requirements
⚠️ Acid-resistant gloves, face shield, chemical splash goggles, acid-resistant apron; avoid skin contact with electrolyte
Isolation & Evacuation
ERG 154: isolate spill area immediate vicinity; if leaking electrolyte, protect with acid-resistant equipment; ventilate enclosed areas
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 154).
First Actions for a UN 2794 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 in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- 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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📋 Copy & Share Field Card
UN 2794 — Batteries, wet, filled with acidHAZMAT RADIO NOTE — UN 2794
Product: Batteries, wet, filled with acid
Class 8 / Corrosive / ERG 154
PPE: Acid-resistant gloves, face shield, chemical splash goggles, acid-resistant apron; avoid skin contact with electrolyte
ISOLATION: ERG 154: isolate spill area immediate vicinity; if leaking electrolyte, protect with acid-resistant equipment; ventilate enclosed areas
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 2794 — Batteries, wet, filled with acid
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Batteries containing liquid sulfuric acid electrolyte solution, typically lead-acid type. Electrolyte is colorless to slightly yellowish corrosive liquid. Batteries are heavy, solid units with internal lead plates.
Water Reactivity: Dilution with water generates heat; acid is miscible with water but addition should be controlled
Extinguishing: Not typically required; water spray for external cooling only, avoid direct contact with battery acid
PPE: Acid-resistant gloves, face shield, chemical splash goggles, acid-resistant apron; avoid skin contact with electrolyte
Isolation: ERG 154: isolate spill area immediate vicinity; if leaking electrolyte, protect with acid-resistant equipment; ventilate enclosed areas
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• Contact with molten substance may cause severe burns to skin and eyes.
• Avoid any skin contact.
— 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/2794 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2794 Batteries, wet, filled with acid Cls8 ERG154 | allfirefighter.com/hazmat/un/2794SMS / 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/2794
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Frequently Asked Questions about UN 2794
TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Corrosives in contact with metals may evolve flammable hydrogen gas.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Acid-resistant gloves, face shield, chemical splash goggles, acid-resistant apron; avoid skin contact with electrolyte
Water reactivity: Dilution with water generates heat; acid is miscible with water but addition should be controlled. Recommended extinguishing: Not typically required; water spray for external cooling only, avoid direct contact with battery acid.
ERG Guide 154 recommendation: ERG 154: isolate spill area immediate vicinity; if leaking electrolyte, protect with acid-resistant equipment; ventilate enclosed areas
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 154 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.