☣️ UN 1052 • CLASS 8
Hydrogen fluoride, 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 1052
Class: 8
Placard type: Corrosive
ERG: Guide 125 (check current ERG)
Isolation: ERG 125: Initial isolation 100m all directions. Protective action distance: small spill 500m downwind daytime, 1.1km nighttime; large spill 1.6km downwind daytime, 4.2km nighttime.
Chemical & Response Details
| Also known as | Hydrofluoric acid anhydrousHFFluorohydric acidAnhydrous hydrofluoric acid |
| CAS Number | 7664-39-3 |
| Appearance | Colorless, fuming liquid or gas with a strong, irritating, pungent odor. Extremely corrosive. May appear as white fumes in air due to moisture reaction. |
| Flash Point | Not applicable (non-flammable) |
| Boiling Point | 19.5°C (67°F) |
| Vapor Density | 0.7 (lighter than air) |
| Water Reactivity | Reacts exothermically with water releasing heat and forming corrosive hydrofluoric acid solution. Avoid direct contact with large quantities of water. |
| Extinguishing | Do not use water directly on material. Use water spray to reduce vapors from safe distance. CO2 and dry chemical ineffective on HF itself. |
| PPE | ⚠️ Level A required for concentrated material. Full-face SCBA, acid-resistant suit with neoprene or butyl rubber protection. Never use leather. Calcium gluconate gel must be immediately available. |
| Isolation | ERG 125: Initial isolation 100m all directions. Protective action distance: small spill 500m downwind daytime, 1.1km nighttime; large spill 1.6km downwind daytime, 4.2km nighttime. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin.
- Vapors are extremely irritating and corrosive.
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may cause environmental contamination.
- Some may burn but none ignite readily.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Some of these materials may react violently with water.
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.
- Many gases are heavier than air and will spread along the ground and collect in low or confined areas
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
- 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 1052 — Hydrogen fluoride, anhydrous HAZMAT RADIO NOTE — UN 1052
Product: Hydrogen fluoride, anhydrous
Class 8 / Corrosive / ERG 125
PPE: Level A required for concentrated material. Full-face SCBA, acid-resistant suit with neoprene or butyl rubber protection. Never use leather. Calcium gluconate gel must be immediately available.
ISOLATION: ERG 125: Initial isolation 100m all directions. Protective action distance: small spill 500m downwind daytime, 1.1km nighttime; large spill 1.6km downwind daytime, 4.2km nighttime.
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 1052 — Hydrogen fluoride, anhydrous
Class: 8 | Placard: Corrosive | ERG Guide: 125
Appearance: Colorless, fuming liquid or gas with a strong, irritating, pungent odor. Extremely corrosive. May appear as white fumes in air due to moisture reaction.
Water Reactivity: Reacts exothermically with water releasing heat and forming corrosive hydrofluoric acid solution. Avoid direct contact with large quantities of water.
Extinguishing: Do not use water directly on material. Use water spray to reduce vapors from safe distance. CO2 and dry chemical ineffective on HF itself.
PPE: Level A required for concentrated material. Full-face SCBA, acid-resistant suit with neoprene or butyl rubber protection. Never use leather. Calcium gluconate gel must be immediately available.
Isolation: ERG 125: Initial isolation 100m all directions. Protective action distance: small spill 500m downwind daytime, 1.1km nighttime; large spill 1.6km downwind daytime, 4.2km nighttime.
— Key Hazards —
• TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin.
• Vapors are extremely irritating and corrosive.
• Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
— 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.
• Many gases are heavier than air and will spread along the ground and collect in low or confined areas
SOURCE: allfirefighter.com/hazmat/un/1052 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1052 Hydrogen fluoride, anhydrous Cls8 ERG125 | allfirefighter.com/hazmat/un/1052SMS / 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/1052
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FAQ
TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin. Vapors are extremely irritating and corrosive. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may cause environmental contamination. Some may burn but none ignite readily. Vapors from liquefied gas are initially heavier than air and spread along ground. Some of these materials may react violently with water.
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 concentrated material. Full-face SCBA, acid-resistant suit with neoprene or butyl rubber protection. Never use leather. Calcium gluconate gel must be immediately available.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 125 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.