☣️ UN 1776 • CLASS 8
Fluorophosphoric acid, anhydrous
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 1776
Class: 8
Placard type: Corrosive
ERG: Guide 154 (check current ERG)
Isolation: ERG 154: isolate spill area immediate 50m in all directions; if tank/rail car involved in fire isolate 800m in all directions and consider evacuation
Chemical & Response Details
| Also known as | Monofluorophosphoric acidPhosphorofluoridic acidFluorophosphoric acid anhydrousDifluorophosphoric acid |
| CAS Number | 13537-32-1 |
| Appearance | Colorless to pale yellow fuming liquid with a pungent, irritating odor. Highly corrosive and reactive with moisture. |
| Flash Point | Not applicable (non-flammable corrosive liquid) |
| Boiling Point | 116C (241F) |
| Vapor Density | 3.5 (heavier than air) |
| Water Reactivity | Reacts vigorously with water generating heat and corrosive fumes; hydrolyzes to form phosphoric and hydrofluoric acids |
| Extinguishing | Do not use water directly on material; dry chemical or CO2 for small fires; use water spray from distance to cool containers only |
| PPE | ⚠️ Level A required for significant releases; SCBA mandatory; acid-resistant suit, gloves, and boots; full face protection with acid-resistant materials |
| Isolation | ERG 154: isolate spill area immediate 50m in all directions; if tank/rail car involved in fire isolate 800m in all directions and consider evacuation |
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 1776 — Fluorophosphoric acid, anhydrous HAZMAT RADIO NOTE — UN 1776
Product: Fluorophosphoric acid, anhydrous
Class 8 / Corrosive / ERG 154
PPE: Level A required for significant releases; SCBA mandatory; acid-resistant suit, gloves, and boots; full face protection with acid-resistant materials
ISOLATION: ERG 154: isolate spill area immediate 50m in all directions; if tank/rail car involved in fire isolate 800m in all directions and consider evacuation
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 1776 — Fluorophosphoric acid, anhydrous
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Colorless to pale yellow fuming liquid with a pungent, irritating odor. Highly corrosive and reactive with moisture.
Water Reactivity: Reacts vigorously with water generating heat and corrosive fumes; hydrolyzes to form phosphoric and hydrofluoric acids
Extinguishing: Do not use water directly on material; dry chemical or CO2 for small fires; use water spray from distance to cool containers only
PPE: Level A required for significant releases; SCBA mandatory; acid-resistant suit, gloves, and boots; full face protection with acid-resistant materials
Isolation: ERG 154: isolate spill area immediate 50m in all directions; if tank/rail car involved in fire isolate 800m in all directions and consider evacuation
— 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/1776 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1776 Fluorophosphoric acid, anhydrous Cls8 ERG154 | allfirefighter.com/hazmat/un/1776SMS / 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/1776
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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 A required for significant releases; SCBA mandatory; acid-resistant suit, gloves, and boots; full face protection with acid-resistant materials
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.