☣️ UN 3266 • CLASS 8
UN 3266 — Corrosive liquid, basic, inorganic, n.o.s.
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 3266 Quick Details
UN 3266
Product name: Corrosive liquid, basic, inorganic, n.o.s.
DOT Class: 8
Placard type: Corrosive
ERG Guide: 154 (check current ERG)
Initial isolation: ERG 154: isolate spill area 50m in all directions; evacuate immediate area if large spill; stay upwind and uphill
Common Hazards of UN 3266
- 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 | Corrosive alkaline liquidInorganic basic corrosive solutionAlkaline corrosive liquid NOSBasic inorganic corrosive |
| Appearance | Variable appearance depending on specific composition; typically clear to colored liquid with alkaline/caustic odor. May be aqueous solutions of hydroxides, oxides, or other basic inorganic compounds. |
| Flash Point | Not applicable (aqueous solutions typically non-flammable) |
| Boiling Point | Variable, typically 100C (212F) or higher depending on concentration and specific compound |
| Vapor Density | Not applicable (liquid) |
| Water Reactivity | May generate heat when diluted with water; some compounds may react more vigorously |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3266
Extinguishing Media
Avoid water streams; use dry chemical, CO2, or foam if applicable for specific compound
PPE Requirements
⚠️ Level B minimum; full face SCBA required; chemical-resistant suit, boots, and gloves; avoid all skin contact with liquid or vapor
Isolation & Evacuation
ERG 154: isolate spill area 50m in all directions; evacuate immediate area if large spill; stay upwind and uphill
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 154).
First Actions for a UN 3266 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 3266 — Corrosive liquid, basic, inorganic, n.o.HAZMAT RADIO NOTE — UN 3266
Product: Corrosive liquid, basic, inorganic, n.o.s.
Class 8 / Corrosive / ERG 154
PPE: Level B minimum; full face SCBA required; chemical-resistant suit, boots, and gloves; avoid all skin contact with liquid or vapor
ISOLATION: ERG 154: isolate spill area 50m in all directions; evacuate immediate area if large spill; stay upwind and uphill
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 3266 — Corrosive liquid, basic, inorganic, n.o.s.
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Variable appearance depending on specific composition; typically clear to colored liquid with alkaline/caustic odor. May be aqueous solutions of hydroxides, oxides, or other basic inorganic compounds.
Water Reactivity: May generate heat when diluted with water; some compounds may react more vigorously
Extinguishing: Avoid water streams; use dry chemical, CO2, or foam if applicable for specific compound
PPE: Level B minimum; full face SCBA required; chemical-resistant suit, boots, and gloves; avoid all skin contact with liquid or vapor
Isolation: ERG 154: isolate spill area 50m in all directions; evacuate immediate area if large spill; stay upwind and uphill
— 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/3266 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3266 Corrosive liquid, basic, inorganic, n.o.s. Cls8 ERG154 | allfirefighter.com/hazmat/un/3266SMS / 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/3266
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Frequently Asked Questions about UN 3266
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; full face SCBA required; chemical-resistant suit, boots, and gloves; avoid all skin contact with liquid or vapor
Water reactivity: May generate heat when diluted with water; some compounds may react more vigorously. Recommended extinguishing: Avoid water streams; use dry chemical, CO2, or foam if applicable for specific compound.
ERG Guide 154 recommendation: ERG 154: isolate spill area 50m in all directions; evacuate immediate area if large spill; stay upwind and uphill
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.