☣️ UN 1824 • CLASS 8
Sodium hydroxide, solution
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 1824
Class: 8
Placard type: Corrosive
ERG: Guide 154 (check current ERG)
Isolation: ERG 154: isolate spill 25m all directions; for large spills isolate 50m and evacuate downwind areas
Chemical & Response Details
| Also known as | Caustic soda solutionLye solutionSoda lyeSodium hydrate solutionNaOH solution |
| CAS Number | 1310-73-2 |
| Appearance | Clear to slightly cloudy colorless liquid with no distinct odor. Highly alkaline solution that is viscous and slippery to the touch. |
| Flash Point | Not applicable (non-flammable aqueous solution) |
| Boiling Point | Varies with concentration; typically 100-140C (212-284F) depending on NaOH percentage |
| Vapor Density | Not applicable (non-volatile aqueous solution) |
| Water Reactivity | Miscible with water; dilution generates significant heat (exothermic reaction) |
| Extinguishing | Water spray for cooling only; CO2 and dry chemical ineffective on caustic liquids |
| PPE | ⚠️ Full chemical-resistant suit with face shield; nitrile or neoprene gloves; SCBA if mist or vapor present; eye protection mandatory |
| Isolation | ERG 154: isolate spill 25m all directions; for large spills isolate 50m and evacuate downwind areas |
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 1824 — Sodium hydroxide, solution HAZMAT RADIO NOTE — UN 1824
Product: Sodium hydroxide, solution
Class 8 / Corrosive / ERG 154
PPE: Full chemical-resistant suit with face shield; nitrile or neoprene gloves; SCBA if mist or vapor present; eye protection mandatory
ISOLATION: ERG 154: isolate spill 25m all directions; for large spills isolate 50m and evacuate downwind 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 1824 — Sodium hydroxide, solution
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Clear to slightly cloudy colorless liquid with no distinct odor. Highly alkaline solution that is viscous and slippery to the touch.
Water Reactivity: Miscible with water; dilution generates significant heat (exothermic reaction)
Extinguishing: Water spray for cooling only; CO2 and dry chemical ineffective on caustic liquids
PPE: Full chemical-resistant suit with face shield; nitrile or neoprene gloves; SCBA if mist or vapor present; eye protection mandatory
Isolation: ERG 154: isolate spill 25m all directions; for large spills isolate 50m and evacuate downwind 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/1824 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1824 Sodium hydroxide, solution Cls8 ERG154 | allfirefighter.com/hazmat/un/1824SMS / 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/1824
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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.
Full chemical-resistant suit with face shield; nitrile or neoprene gloves; SCBA if mist or vapor present; eye protection mandatory
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.