☣️ UN 2420 • CLASS 2
UN 2420 — Hexafluoroacetone
Placard: Toxic Gas. ERG Guide 125. 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 2420 Quick Details
UN 2420
Product name: Hexafluoroacetone
DOT Class: 2
Placard type: Toxic Gas
ERG Guide: 125 (check current ERG)
Initial isolation: ERG 125: Isolate spill/leak 100m in all directions; evacuate immediate area; downwind vapor hazard significant
Common Hazards of UN 2420
- 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.
Chemical Identity & Physical Properties
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2420
Extinguishing Media
Not applicable (non-flammable); use water spray to disperse vapors, CO2 or dry chemical for surrounding fires
PPE Requirements
⚠️ Level A required for high concentrations; SCBA mandatory; full chemical-resistant suit; severe skin and respiratory hazard
Isolation & Evacuation
ERG 125: Isolate spill/leak 100m in all directions; evacuate immediate area; downwind vapor hazard significant
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 125).
First Actions for a UN 2420 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.
- 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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📋 Copy & Share Field Card
UN 2420 — HexafluoroacetoneHAZMAT 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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Frequently Asked Questions about UN 2420
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
Water reactivity: Reacts with water forming hydrates; reaction is exothermic but not violent. Recommended extinguishing: Not applicable (non-flammable); use water spray to disperse vapors, CO2 or dry chemical for surrounding fires.
ERG Guide 125 recommendation: ERG 125: Isolate spill/leak 100m in all directions; evacuate immediate area; downwind vapor hazard significant
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.