☣️ UN 3264 • CLASS 8
Corrosive liquid, acidic, inorganic, n.o.s.
Placard: Corrosive. 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 3264
Class: 8
Placard type: Corrosive
ERG: Guide 154 (check current ERG)
Isolation: ERG 154: isolate spill area at least 25m (75ft) in all directions; for large spills, consider initial downwind evacuation 300m (1000ft)
Chemical & Response Details
| Also known as | Corrosive liquid, acidic, inorganic, n.o.s.Acidic inorganic liquidInorganic acid solutionCorrosive inorganic acid |
| Appearance | Variable appearance depending on specific acid; typically a clear to colored liquid at room temperature. May be odorless or have a pungent, irritating odor characteristic of the specific inorganic acid. |
| Flash Point | Not applicable (inorganic aqueous solutions typically non-flammable) |
| Boiling Point | Variable depending on specific acid and concentration; typically 100-300°C (212-572°F) |
| Vapor Density | Variable; typically heavier than air (>1) |
| Water Reactivity | May generate heat when diluted with water; always add acid to water, never water to acid to prevent violent reaction and spattering |
| Extinguishing | Avoid water streams; use water spray to cool containers, soda ash or lime to neutralize small spills, CO2 for any associated fire |
| PPE | ⚠️ Level B minimum required; full face SCBA, acid-resistant suit, gloves, and boots; Level A if vapor concentration unknown or high splash risk |
| Isolation | ERG 154: isolate spill area at least 25m (75ft) in all directions; for large spills, consider initial downwind evacuation 300m (1000ft) |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
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 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 3264 — Corrosive liquid, acidic, inorganic, n.o HAZMAT RADIO NOTE — UN 3264
Product: Corrosive liquid, acidic, inorganic, n.o.s.
Class 8 / Corrosive / ERG 154
PPE: Level B minimum required; full face SCBA, acid-resistant suit, gloves, and boots; Level A if vapor concentration unknown or high splash risk
ISOLATION: ERG 154: isolate spill area at least 25m (75ft) in all directions; for large spills, consider initial downwind evacuation 300m (1000ft)
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 3264 — Corrosive liquid, acidic, inorganic, n.o.s.
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Variable appearance depending on specific acid; typically a clear to colored liquid at room temperature. May be odorless or have a pungent, irritating odor characteristic of the specific inorganic acid.
Water Reactivity: May generate heat when diluted with water; always add acid to water, never water to acid to prevent violent reaction and spattering
Extinguishing: Avoid water streams; use water spray to cool containers, soda ash or lime to neutralize small spills, CO2 for any associated fire
PPE: Level B minimum required; full face SCBA, acid-resistant suit, gloves, and boots; Level A if vapor concentration unknown or high splash risk
Isolation: ERG 154: isolate spill area at least 25m (75ft) in all directions; for large spills, consider initial downwind evacuation 300m (1000ft)
— 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/3264 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3264 Corrosive liquid, acidic, inorganic, n.o.s. Cls8 ERG154 | allfirefighter.com/hazmat/un/3264SMS / 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/3264
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FAQ
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 required; full face SCBA, acid-resistant suit, gloves, and boots; Level A if vapor concentration unknown or high splash risk
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.