☣️ UN 1719 • CLASS 8
Caustic alkali liquid, 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 1719
Class: 8
Placard type: Corrosive
ERG: Guide 154 (check current ERG)
Isolation: ERG 154: Isolate spill area immediately for at least 50 meters in all directions. If tank/rail car involved in fire, isolate 800 meters in all directions.
Chemical & Response Details
| Appearance | Clear to colored liquid, variable odor depending on specific alkali. Corrosive solution of various alkaline substances such as sodium hydroxide, potassium hydroxide, or other strong bases. |
| Flash Point | Not applicable (aqueous solution, non-flammable) |
| Boiling Point | Variable, typically above 100C (212F) depending on concentration and specific alkali |
| Vapor Density | Not applicable (low volatility aqueous solution) |
| Water Reactivity | Generally miscible with water; may generate heat on dilution. Do not add water directly to concentrated solutions. |
| Extinguishing | Use water spray to reduce vapors or divert liquid flow; dry chemical if fire involves other materials; avoid direct water streams on spills |
| PPE | ⚠️ Level B minimum; SCBA required in confined spaces or high vapor concentration; full face shield, chemical-resistant gloves, boots, and protective suit; rubber or neoprene materials preferred |
| Isolation | ERG 154: Isolate spill area immediately for at least 50 meters in all directions. If tank/rail car involved in fire, isolate 800 meters in all directions. |
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 1719 — Caustic alkali liquid, n.o.s. HAZMAT RADIO NOTE — UN 1719
Product: Caustic alkali liquid, n.o.s.
Class 8 / Corrosive / ERG 154
PPE: Level B minimum; SCBA required in confined spaces or high vapor concentration; full face shield, chemical-resistant gloves, boots, and protective suit; rubber or neoprene materials preferred
ISOLATION: ERG 154: Isolate spill area immediately for at least 50 meters in all directions. If tank/rail car involved in fire, isolate 800 meters in all directions.
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 1719 — Caustic alkali liquid, n.o.s.
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Clear to colored liquid, variable odor depending on specific alkali. Corrosive solution of various alkaline substances such as sodium hydroxide, potassium hydroxide, or other strong bases.
Water Reactivity: Generally miscible with water; may generate heat on dilution. Do not add water directly to concentrated solutions.
Extinguishing: Use water spray to reduce vapors or divert liquid flow; dry chemical if fire involves other materials; avoid direct water streams on spills
PPE: Level B minimum; SCBA required in confined spaces or high vapor concentration; full face shield, chemical-resistant gloves, boots, and protective suit; rubber or neoprene materials preferred
Isolation: ERG 154: Isolate spill area immediately for at least 50 meters in all directions. If tank/rail car involved in fire, isolate 800 meters in all directions.
— 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/1719 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1719 Caustic alkali liquid, n.o.s. Cls8 ERG154 | allfirefighter.com/hazmat/un/1719SMS / 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/1719
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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; SCBA required in confined spaces or high vapor concentration; full face shield, chemical-resistant gloves, boots, and protective suit; rubber or neoprene materials preferred
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.