☣️ UN 2795 • CLASS 8
UN 2795 — Batteries, wet, filled with alkali
Placard: Corrosive. ERG Guide 154. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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 2795 Quick Details
UN 2795
Product name: Batteries, wet, filled with alkali
DOT Class: 8
Placard type: Corrosive
ERG Guide: 154 (check current ERG)
Initial isolation: ERG 154: isolate spill area at least 25m in all directions; for large spills isolate 50m and consider evacuation; contain runoff to prevent environmental contamination
Common Hazards of UN 2795
- 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 | Alkaline batteries (wet)Potassium hydroxide batteriesSodium hydroxide batteriesKOH batteriesNaOH batteriesWet cell alkaline batteries |
| Appearance | Battery units containing liquid alkaline electrolyte solution, typically clear to slightly colored corrosive liquid (potassium hydroxide or sodium hydroxide solution) housed in battery casings. |
| Flash Point | Not applicable (non-flammable corrosive liquid) |
| Boiling Point | Approximately 100-140C (212-284F) depending on electrolyte concentration |
| Vapor Density | Not applicable (non-volatile liquid) |
| Water Reactivity | Generates heat when diluted; alkaline solution remains highly corrosive |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2795
Extinguishing Media
Water spray, dry chemical, CO2 suitable; avoid direct water stream on damaged batteries
PPE Requirements
⚠️ Level B minimum; chemical-resistant suit, gloves, boots; face shield; SCBA for confined spaces or spills; full skin and eye protection mandatory
Isolation & Evacuation
ERG 154: isolate spill area at least 25m in all directions; for large spills isolate 50m and consider evacuation; contain runoff to prevent environmental contamination
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 154).
First Actions for a UN 2795 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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UN 2795 — Batteries, wet, filled with alkaliHAZMAT RADIO NOTE — UN 2795
Product: Batteries, wet, filled with alkali
Class 8 / Corrosive / ERG 154
PPE: Level B minimum; chemical-resistant suit, gloves, boots; face shield; SCBA for confined spaces or spills; full skin and eye protection mandatory
ISOLATION: ERG 154: isolate spill area at least 25m in all directions; for large spills isolate 50m and consider evacuation; contain runoff to prevent environmental contamination
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 2795 — Batteries, wet, filled with alkali
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Battery units containing liquid alkaline electrolyte solution, typically clear to slightly colored corrosive liquid (potassium hydroxide or sodium hydroxide solution) housed in battery casings.
Water Reactivity: Generates heat when diluted; alkaline solution remains highly corrosive
Extinguishing: Water spray, dry chemical, CO2 suitable; avoid direct water stream on damaged batteries
PPE: Level B minimum; chemical-resistant suit, gloves, boots; face shield; SCBA for confined spaces or spills; full skin and eye protection mandatory
Isolation: ERG 154: isolate spill area at least 25m in all directions; for large spills isolate 50m and consider evacuation; contain runoff to prevent environmental contamination
— 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/2795 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2795 Batteries, wet, filled with alkali Cls8 ERG154 | allfirefighter.com/hazmat/un/2795SMS / 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/2795
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Frequently Asked Questions about UN 2795
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.
Level B minimum; chemical-resistant suit, gloves, boots; face shield; SCBA for confined spaces or spills; full skin and eye protection mandatory
Water reactivity: Generates heat when diluted; alkaline solution remains highly corrosive. Recommended extinguishing: Water spray, dry chemical, CO2 suitable; avoid direct water stream on damaged batteries.
ERG Guide 154 recommendation: ERG 154: isolate spill area at least 25m in all directions; for large spills isolate 50m and consider evacuation; contain runoff to prevent environmental contamination
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.