☣️ UN 1775 • CLASS 8
UN 1775 — Fluoroboric acid
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 1775 Quick Details
UN 1775
Product name: Fluoroboric acid
DOT Class: 8
Placard type: Corrosive
ERG Guide: 154 (check current ERG)
Initial isolation: ERG 154: isolate spill 25-50m; if tank/rail car involved, isolate 800m all directions initially
Common Hazards of UN 1775
- 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 | Tetrafluoroboric acidBorofluoric acidHydrogen tetrafluoroborateFluoroborate |
| CAS Number | 16872-11-0 |
| Appearance | Colorless to slightly yellow liquid with a pungent, acrid odor. Corrosive aqueous solution, typically 48-50% concentration in water. |
| Flash Point | Not applicable (non-flammable aqueous solution) |
| Boiling Point | 130C (266F) for 48% solution; decomposes at higher temperatures |
| Vapor Density | Not applicable (aqueous solution, heavier than air vapors) |
| Water Reactivity | Soluble in water, releases heat when diluted; already an aqueous solution |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1775
Extinguishing Media
Not applicable for spills; use soda ash, lime for neutralization; no foam needed
PPE Requirements
⚠️ Level B minimum; full face SCBA, acid-resistant suit, butyl or neoprene gloves required
Isolation & Evacuation
ERG 154: isolate spill 25-50m; if tank/rail car involved, isolate 800m all directions initially
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 154).
First Actions for a UN 1775 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 1775 — Fluoroboric acidHAZMAT RADIO NOTE — UN 1775
Product: Fluoroboric acid
Class 8 / Corrosive / ERG 154
PPE: Level B minimum; full face SCBA, acid-resistant suit, butyl or neoprene gloves required
ISOLATION: ERG 154: isolate spill 25-50m; if tank/rail car involved, isolate 800m all directions 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 1775 — Fluoroboric acid
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Colorless to slightly yellow liquid with a pungent, acrid odor. Corrosive aqueous solution, typically 48-50% concentration in water.
Water Reactivity: Soluble in water, releases heat when diluted; already an aqueous solution
Extinguishing: Not applicable for spills; use soda ash, lime for neutralization; no foam needed
PPE: Level B minimum; full face SCBA, acid-resistant suit, butyl or neoprene gloves required
Isolation: ERG 154: isolate spill 25-50m; if tank/rail car involved, isolate 800m all directions 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/1775 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1775 Fluoroboric acid Cls8 ERG154 | ERG 154: isolate spill 25-50m; if tank/rail car involved, isolate 800m all direc | allfirefighter.com/hazmat/un/1775SMS / 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/1775
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Frequently Asked Questions about UN 1775
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; full face SCBA, acid-resistant suit, butyl or neoprene gloves required
Water reactivity: Soluble in water, releases heat when diluted; already an aqueous solution. Recommended extinguishing: Not applicable for spills; use soda ash, lime for neutralization; no foam needed.
ERG Guide 154 recommendation: ERG 154: isolate spill 25-50m; if tank/rail car involved, isolate 800m all directions 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.