☣️ UN 2817 • CLASS 8
UN 2817 — Ammonium hydrogendifluoride, solution
Placard: Corrosive. 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.
Ammonium hydrogendifluoride, solution is a corrosive fluoride-containing liquid. It requires special concern because fluoride exposure can cause deep injury and systemic effects.
Hazard overview: Do not treat this as an ordinary acid spill. Skin exposure may be serious even when pain is delayed, and mist or heated material can release toxic fluoride fumes.
Response guidance: Isolate the area, avoid contact and keep runoff contained. Use compatible dry chemical or carbon dioxide for small fires and water spray for cooling only when it will not spread the spill.
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UN 2817 Quick Details
UN 2817
Product name: Ammonium hydrogendifluoride, solution
DOT Class: 8
Placard type: Corrosive
ERG Guide: 154 (check current ERG)
Initial isolation: ERG 154: isolate spill 25-50m all directions; for large spill isolate 100m and evacuate downwind 300m initially
Common Hazards of UN 2817
- Ammonium hydrogendifluoride solution is corrosive and can cause deep tissue injury.
- Fluoride exposure may produce serious systemic toxicity after skin contact.
- Vapors, mist or splashes can injure eyes and respiratory tissue.
- Heating or fire can release toxic and corrosive fluoride fumes.
- Dilution with water can release heat and spread contamination.
- Contact with metals may release flammable hydrogen gas.
- Runoff can remain acidic, toxic and difficult to decontaminate.
Chemical Identity & Physical Properties
The solution is usually clear to slightly colored with a pungent irritating odor. Concentration affects corrosivity and heat release during dilution.
| Also known as | Ammonium bifluoride solutionAmmonium hydrogen fluoride solutionAmmonium acid fluoride solutionABF solution |
| CAS Number | 1341-49-7 |
| Appearance | Clear to slightly colored aqueous solution with a pungent, irritating odor. Highly corrosive liquid at room temperature. |
| Flash Point | Not applicable (aqueous solution) |
| Boiling Point | Approximately 100-120C (212-248F) depending on concentration |
| Vapor Density | Not applicable (aqueous solution) |
| Water Reactivity | Already in aqueous solution; dilution with water reduces corrosivity but releases heat |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2817
Extinguishing Media
Dry chemical, CO2 for small fires; avoid direct water streams on spills
PPE Requirements
⚠️ Level B minimum with full face SCBA; acid-resistant suit, gloves, and boots required; avoid all skin contact
Use acid-resistant chemical protection, gloves, boots, face protection and SCBA. Ensure medical/decon resources are prepared for fluoride exposure.
Isolation & Evacuation
ERG 154: isolate spill 25-50m all directions; for large spill isolate 100m and evacuate downwind 300m initially
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 154).
First Actions for a UN 2817 Incident
- Call 911 and the emergency response number shown on the shipping papers or container documents.
- Keep unauthorized personnel away and establish an isolation perimeter before entry.
- Stay upwind, uphill and upstream; keep responders out of vapors, dusts and runoff.
- Avoid breathing vapors, dust, mist or smoke and avoid skin or eye contact.
- Do not touch damaged containers or spilled material unless properly trained and protected.
- Ventilate confined spaces only when personnel are trained, equipped and monitored.
- Use ERG guidance, SDS, shipping papers and air monitoring to confirm protective actions.
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📋 Copy & Share Field Card
UN 2817 — Ammonium hydrogendifluoride, solutionHAZMAT RADIO NOTE — UN 2817
Product: Ammonium hydrogendifluoride, solution
Class 8 / Corrosive / ERG 154
PPE: Level B minimum with full face SCBA; acid-resistant suit, gloves, and boots required; avoid all skin contact
ISOLATION: ERG 154: isolate spill 25-50m all directions; for large spill isolate 100m and evacuate downwind 300m initially
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 2817 — Ammonium hydrogendifluoride, solution
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Clear to slightly colored aqueous solution with a pungent, irritating odor. Highly corrosive liquid at room temperature.
Water Reactivity: Already in aqueous solution; dilution with water reduces corrosivity but releases heat
Extinguishing: Dry chemical, CO2 for small fires; avoid direct water streams on spills
PPE: Level B minimum with full face SCBA; acid-resistant suit, gloves, and boots required; avoid all skin contact
Isolation: ERG 154: isolate spill 25-50m all directions; for large spill isolate 100m and evacuate downwind 300m initially
— Key Hazards —
• Ammonium hydrogendifluoride solution is corrosive and can cause deep tissue injury.
• Fluoride exposure may produce serious systemic toxicity after skin contact.
• Vapors, mist or splashes can injure eyes and respiratory tissue.
— First Actions —
• Call 911 and the emergency response number shown on the shipping papers or container documents.
• Keep unauthorized personnel away and establish an isolation perimeter before entry.
• Stay upwind, uphill and upstream; keep responders out of vapors, dusts and runoff.
• Avoid breathing vapors, dust, mist or smoke and avoid skin or eye contact.
SOURCE: allfirefighter.com/hazmat/un/ammonium-hydrogendifluoride-solution-un-2817 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN2817 Ammonium hydrogendifluoride, solution Cls8 ERG154 | allfirefighter.com/hazmat/un/ammonium-hydrogendifluoride-solution-un-2817SMS / 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/ammonium-hydrogendifluoride-solution-un-2817
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Frequently Asked Questions about UN 2817
It is both corrosive and fluoride-toxic; skin exposure can cause deep tissue and systemic effects.
Yes. Fluoride acid exposures may not be immediately painful but can still be serious.
SCBA, acid-resistant suit, gloves, boots and full face protection are needed for spill entry.
Water may be used for controlled dilution or cooling, but it can release heat and spread contamination.
Confirm concentration, SDS first aid guidance and available fluoride-exposure medical treatment resources.
Heating can release toxic and corrosive fluoride-containing fumes.
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.