☣️ UN 2420 • CLASS 2
Hexafluoroacetone
Placard: Toxic Gas. 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 2420
Class: 2
Placard type: Toxic Gas
ERG: Guide 125 (check current ERG)
Isolation: ERG 125: Isolate spill/leak 100m in all directions; evacuate immediate area; downwind vapor hazard significant
Chemical & Response Details
| Also known as | HFA1,1,1,3,3,3-Hexafluoro-2-propanonePerfluoroacetoneHexafluoropropanone |
| CAS Number | 684-16-2 |
| Appearance | Colorless gas with a pungent, musty odor. Shipped as a liquefied compressed gas. Heavier than air. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | -28°C (-18°F) |
| Vapor Density | 7.2 (heavier than air) |
| Water Reactivity | Reacts with water forming hydrates; reaction is exothermic but not violent |
| Extinguishing | Not applicable (non-flammable); use water spray to disperse vapors, CO2 or dry chemical for surrounding fires |
| PPE | ⚠️ Level A required for high concentrations; SCBA mandatory; full chemical-resistant suit; severe skin and respiratory hazard |
| Isolation | ERG 125: Isolate spill/leak 100m in all directions; evacuate immediate area; downwind vapor hazard significant |
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 2420 — Hexafluoroacetone HAZMAT RADIO NOTE — UN 2420
Product: Hexafluoroacetone
Class 2 / Toxic Gas / ERG 125
PPE: Level A required for high concentrations; SCBA mandatory; full chemical-resistant suit; severe skin and respiratory hazard
ISOLATION: ERG 125: Isolate spill/leak 100m in all directions; evacuate immediate area; downwind vapor hazard significant
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 2420 — Hexafluoroacetone
Class: 2 | Placard: Toxic Gas | ERG Guide: 125
Appearance: Colorless gas with a pungent, musty odor. Shipped as a liquefied compressed gas. Heavier than air.
Water Reactivity: Reacts with water forming hydrates; reaction is exothermic but not violent
Extinguishing: Not applicable (non-flammable); use water spray to disperse vapors, CO2 or dry chemical for surrounding fires
PPE: Level A required for high concentrations; SCBA mandatory; full chemical-resistant suit; severe skin and respiratory hazard
Isolation: ERG 125: Isolate spill/leak 100m in all directions; evacuate immediate area; downwind vapor hazard significant
— 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/2420 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2420 Hexafluoroacetone Cls2 ERG125 | ERG 125: Isolate spill/leak 100m in all directions; evacuate immediate area; dow | allfirefighter.com/hazmat/un/2420SMS / 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/2420
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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 high concentrations; SCBA mandatory; full chemical-resistant suit; severe skin and respiratory hazard
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.