☣️ UN 1782 • CLASS 8
UN 1782 — Hexafluorophosphoric acid
Placard: Corrosive. ERG Guide 154. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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 1782 Quick Details
UN 1782
Product name: Hexafluorophosphoric acid
DOT Class: 8
Placard type: Corrosive
ERG Guide: 154 (check current ERG)
Initial isolation: ERG 154: isolate spill 25-50m all directions; evacuate immediate area if large spill; avoid low-lying areas due to dense vapors
Common Hazards of UN 1782
- 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 | Hexafluorophosphoric acidHydrofluorophosphoric acidPhosphoric hexafluoride acidHydrogen hexafluorophosphateHPF6 |
| CAS Number | 16940-81-1 |
| Appearance | Colorless to pale yellow fuming liquid with a pungent, irritating odor. Highly corrosive and generates toxic fumes upon contact with moisture. |
| Flash Point | Not applicable (non-flammable) |
| Boiling Point | Decomposes before boiling |
| Vapor Density | Heavier than air |
| Water Reactivity | Reacts with water releasing heat and highly corrosive hydrofluoric acid vapors; handle with extreme caution |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1782
Extinguishing Media
Do not use water directly; use dry chemical, soda ash, or lime to neutralize small spills
PPE Requirements
⚠️ Level A required for significant releases; full face SCBA, acid-resistant suit, neoprene or butyl rubber gloves; avoid all contact
Isolation & Evacuation
ERG 154: isolate spill 25-50m all directions; evacuate immediate area if large spill; avoid low-lying areas due to dense vapors
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 154).
First Actions for a UN 1782 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 1782 — Hexafluorophosphoric acidHAZMAT RADIO NOTE — UN 1782
Product: Hexafluorophosphoric acid
Class 8 / Corrosive / ERG 154
PPE: Level A required for significant releases; full face SCBA, acid-resistant suit, neoprene or butyl rubber gloves; avoid all contact
ISOLATION: ERG 154: isolate spill 25-50m all directions; evacuate immediate area if large spill; avoid low-lying areas due to dense vapors
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 1782 — Hexafluorophosphoric acid
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Colorless to pale yellow fuming liquid with a pungent, irritating odor. Highly corrosive and generates toxic fumes upon contact with moisture.
Water Reactivity: Reacts with water releasing heat and highly corrosive hydrofluoric acid vapors; handle with extreme caution
Extinguishing: Do not use water directly; use dry chemical, soda ash, or lime to neutralize small spills
PPE: Level A required for significant releases; full face SCBA, acid-resistant suit, neoprene or butyl rubber gloves; avoid all contact
Isolation: ERG 154: isolate spill 25-50m all directions; evacuate immediate area if large spill; avoid low-lying areas due to dense vapors
— 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/1782 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1782 Hexafluorophosphoric acid Cls8 ERG154 | allfirefighter.com/hazmat/un/1782SMS / 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/1782
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Frequently Asked Questions about UN 1782
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 A required for significant releases; full face SCBA, acid-resistant suit, neoprene or butyl rubber gloves; avoid all contact
Water reactivity: Reacts with water releasing heat and highly corrosive hydrofluoric acid vapors; handle with extreme caution. Recommended extinguishing: Do not use water directly; use dry chemical, soda ash, or lime to neutralize small spills.
ERG Guide 154 recommendation: ERG 154: isolate spill 25-50m all directions; evacuate immediate area if large spill; avoid low-lying areas due to dense vapors
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.