☣️ 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.
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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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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
- 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
| 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
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. 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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📋 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 —
• 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/2817 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2817 Ammonium hydrogendifluoride, solution Cls8 ERG154 | allfirefighter.com/hazmat/un/2817SMS / 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/2817
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Frequently Asked Questions about UN 2817
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 with full face SCBA; acid-resistant suit, gloves, and boots required; avoid all skin contact
Water reactivity: Already in aqueous solution; dilution with water reduces corrosivity but releases heat. Recommended extinguishing: Dry chemical, CO2 for small fires; avoid direct water streams on spills.
ERG Guide 154 recommendation: ERG 154: isolate spill 25-50m all directions; for large spill isolate 100m and evacuate downwind 300m initially
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.