☣️ UN 3422 • CLASS 6
UN 3422 — Potassium fluoride, solution
Placard: Toxic. ERG Guide 154. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ Verification required:
Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ 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.
UN 3422 is Potassium fluoride, solution, a toxic fluoride salt solution. It is normally nonflammable but can cause serious fluoride poisoning and corrosive injury.
Hazard overview: UN 3422 can injure the skin, eyes and respiratory tract, and fluoride absorption may produce systemic toxicity. Fire can generate toxic or corrosive decomposition products, and contaminated water runoff should be controlled.
Response guidance: For UN 3422, isolate the area, avoid splashes and mist, and stop the leak only with appropriate protection. Use water spray, fog or mist to cool containers or manage surrounding fire while avoiding high-pressure streams that spread contamination.
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UN 3422 Quick Details
UN 3422
Product name: Potassium fluoride, solution
DOT Class: 6
Placard type: Toxic
ERG Guide: 154 (check current ERG)
Initial isolation: ERG 154: isolate spill 25-50m all directions; evacuate immediate area if large spill; for fire involving tanks/cargo, isolate 800m all directions
Common Hazards of UN 3422
- 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
UN 3422 is a clear to slightly turbid aqueous liquid, usually colorless to pale yellow and with little odor. It dissolves readily in water and may release heat during dilution.
| Also known as | Potassium fluoride solutionKF solutionPotassium fluorure solutionFluorpotassium solution |
| CAS Number | 7789-23-3 |
| Appearance | Clear to slightly turbid aqueous solution, colorless to pale yellow. Odorless or faint chemical odor. Liquid at room temperature. |
| Flash Point | Not applicable (aqueous solution) |
| Boiling Point | Approximately 100C (212F), varies with concentration |
| Vapor Density | Not applicable (non-volatile aqueous solution) |
| Water Reactivity | Already in aqueous solution; dissolves readily in water with heat generation |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3422
Extinguishing Media
Water spray, fog, or mist for cooling; avoid high-pressure water streams that may spread contamination
PPE Requirements
⚠️ Level B minimum with liquid-tight chemical protective suit; SCBA required; neoprene or butyl rubber gloves; face shield and goggles; avoid all skin contact
Use SCBA where aerosols or confined-space exposure are possible, with liquid-tight chemical protective clothing, face shield, goggles and compatible gloves. Avoid all skin contact.
Isolation & Evacuation
ERG 154: isolate spill 25-50m all directions; evacuate immediate area if large spill; for fire involving tanks/cargo, isolate 800m all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 154).
First Actions for a UN 3422 Incident
- 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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📋 Copy & Share Field Card
UN 3422 — Potassium fluoride, solutionHAZMAT RADIO NOTE — UN 3422
Product: Potassium fluoride, solution
Class 6 / Toxic / ERG 154
PPE: Level B minimum with liquid-tight chemical protective suit; SCBA required; neoprene or butyl rubber gloves; face shield and goggles; avoid all skin contact
ISOLATION: ERG 154: isolate spill 25-50m all directions; evacuate immediate area if large spill; for fire involving tanks/cargo, isolate 800m 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 3422 — Potassium fluoride, solution
Class: 6 | Placard: Toxic | ERG Guide: 154
Appearance: Clear to slightly turbid aqueous solution, colorless to pale yellow. Odorless or faint chemical odor. Liquid at room temperature.
Water Reactivity: Already in aqueous solution; dissolves readily in water with heat generation
Extinguishing: Water spray, fog, or mist for cooling; avoid high-pressure water streams that may spread contamination
PPE: Level B minimum with liquid-tight chemical protective suit; SCBA required; neoprene or butyl rubber gloves; face shield and goggles; avoid all skin contact
Isolation: ERG 154: isolate spill 25-50m all directions; evacuate immediate area if large spill; for fire involving tanks/cargo, isolate 800m 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 —
• 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
SOURCE: allfirefighter.com/hazmat/un/potassium-fluoride-solution-un-3422 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3422 Potassium fluoride, solution Cls6 ERG154 | allfirefighter.com/hazmat/un/potassium-fluoride-solution-un-3422SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/potassium-fluoride-solution-un-3422
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Frequently Asked Questions about UN 3422
UN 3422 is Potassium fluoride, solution. It should be identified from shipping papers, markings and the SDS before responders work near the release.
ERG Guide 154 applies to UN 3422 for initial isolation, protective actions and first-response guidance.
UN 3422 is not primarily classified as flammable, but fire may produce toxic or corrosive gases and containers may become dangerous when heated.
Use SCBA where aerosols or confined-space exposure are possible, with liquid-tight chemical protective clothing, face shield, goggles and compatible gloves. Avoid all skin contact.
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.