☣️ UN 2552 • CLASS 6
UN 2552 — Hexafluoroacetone hydrate, liquid
Placard: Toxic. ERG Guide 151. 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 2552 Quick Details
UN 2552
Product name: Hexafluoroacetone hydrate, liquid
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m in all directions and evacuate 1600m downwind
Common Hazards of UN 2552
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- 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
- Containers may explode when heated.
- Runoff may pollute waterways.
Chemical Identity & Physical Properties
| Also known as | HFA hydrate1,1,1,3,3,3-hexafluoroacetone hydratehexafluoropropanone hydratehexafluoroacetone monohydrate |
| CAS Number | 34202-69-2 |
| Appearance | Colorless to pale yellow liquid with a pungent, irritating odor. Fuming liquid that absorbs moisture from air. |
| Flash Point | Not applicable (non-flammable) |
| Boiling Point | 106C (223F) |
| Vapor Density | 5.2 (heavier than air) |
| Water Reactivity | Miscible with water; hydrolyzes slowly releasing hexafluoroacetone |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2552
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical, water spray for cooling only
PPE Requirements
⚠️ Level A or B required; full chemical protective suit with SCBA; avoid all skin contact due to extreme toxicity
Isolation & Evacuation
ERG 151: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m in all directions and evacuate 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 2552 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.
- 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 2552 — Hexafluoroacetone hydrate, liquidHAZMAT RADIO NOTE — UN 2552
Product: Hexafluoroacetone hydrate, liquid
Class 6 / Toxic / ERG 151
PPE: Level A or B required; full chemical protective suit with SCBA; avoid all skin contact due to extreme toxicity
ISOLATION: ERG 151: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m in all directions and evacuate 1600m downwind
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 2552 — Hexafluoroacetone hydrate, liquid
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Colorless to pale yellow liquid with a pungent, irritating odor. Fuming liquid that absorbs moisture from air.
Water Reactivity: Miscible with water; hydrolyzes slowly releasing hexafluoroacetone
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling only
PPE: Level A or B required; full chemical protective suit with SCBA; avoid all skin contact due to extreme toxicity
Isolation: ERG 151: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m in all directions and evacuate 1600m downwind
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Avoid any skin contact.
• Fire may produce irritating, corrosive and/or toxic gases.
— 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.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/2552 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2552 Hexafluoroacetone hydrate, liquid Cls6 ERG151 | allfirefighter.com/hazmat/un/2552SMS / 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/2552
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Frequently Asked Questions about UN 2552
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. 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 Containers may explode when heated. Runoff may pollute waterways.
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 or B required; full chemical protective suit with SCBA; avoid all skin contact due to extreme toxicity
Water reactivity: Miscible with water; hydrolyzes slowly releasing hexafluoroacetone. Recommended extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling only.
ERG Guide 151 recommendation: ERG 151: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m in all directions and evacuate 1600m downwind
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 151 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.