☣️ UN 3436 • CLASS 6
UN 3436 — Hexafluoroacetone hydrate, solid
Placard: Toxic. ERG Guide 151. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ Verification required:
Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ 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.
UN 3436 Hexafluoroacetone hydrate, solid is assigned to ERG Guide 151. The exact risk depends on the shipment form, concentration and SDS, but responders should verify shipping papers before committing crews.
Hazard overview: Primary hazards for UN 3436 include: 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. Control ignition sources, avoid direct contact and keep personnel upwind.
Response guidance: For a UN 3436 incident, isolate the area, deny entry, stay upwind and use ERG Guide 151 with the shipping papers or SDS. Use compatible extinguishing media only and prevent contaminated runoff from spreading.
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UN 3436 Quick Details
UN 3436
Product name: Hexafluoroacetone hydrate, solid
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill 25m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
Common Hazards of UN 3436
- 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 contamination.
- 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
UN 3436 is described as: White to off-white crystalline solid with a pungent, acrid odor. Stable at room temperature when hydrated.
| Also known as | Hexafluoroacetone sesquihydrateHFA hydrate1,1,1,3,3,3-Hexafluoroacetone hydrateHexafluoro-2-propanone hydrate |
| CAS Number | 34619-12-0 |
| Appearance | White to off-white crystalline solid with a pungent, acrid odor. Stable at room temperature when hydrated. |
| Flash Point | Not applicable (non-flammable solid) |
| Boiling Point | Not applicable (solid form decomposes before melting) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water, releasing hexafluoroacetone which is highly irritating and toxic |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3436
Extinguishing Media
Dry chemical, CO2, or dry sand; water spray may be used to dilute spills but generates toxic vapors
PPE Requirements
⚠️ Level A or B required; full-face SCBA, chemical-resistant suit, butyl rubber gloves; avoid all skin contact
PPE guidance for UN 3436: Level A or B required; full-face SCBA, chemical-resistant suit, butyl rubber gloves; avoid all skin contact
Isolation & Evacuation
ERG 151: isolate spill 25m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 3436 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- 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 distance in the downwind direction as conditions require.
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📋 Copy & Share Field Card
UN 3436 — Hexafluoroacetone hydrate, solidHAZMAT RADIO NOTE — UN 3436
Product: Hexafluoroacetone hydrate, solid
Class 6 / Toxic / ERG 151
PPE: Level A or B required; full-face SCBA, chemical-resistant suit, butyl rubber gloves; avoid all skin contact
ISOLATION: ERG 151: isolate spill 25m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
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 3436 — Hexafluoroacetone hydrate, solid
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: White to off-white crystalline solid with a pungent, acrid odor. Stable at room temperature when hydrated.
Water Reactivity: Soluble in water, releasing hexafluoroacetone which is highly irritating and toxic
Extinguishing: Dry chemical, CO2, or dry sand; water spray may be used to dilute spills but generates toxic vapors
PPE: Level A or B required; full-face SCBA, chemical-resistant suit, butyl rubber gloves; avoid all skin contact
Isolation: ERG 151: isolate spill 25m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
— 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 the emergency response telephone number on the shipping paper, if available.
• 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/hexafluoroacetone-hydrate-solid-un-3436 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3436 Hexafluoroacetone hydrate, solid Cls6 ERG151 | allfirefighter.com/hazmat/un/hexafluoroacetone-hydrate-solid-un-3436SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/hexafluoroacetone-hydrate-solid-un-3436
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Frequently Asked Questions about UN 3436
UN 3436 is Hexafluoroacetone hydrate, solid, a Class 6 hazardous material assigned to ERG Guide 151.
UN 3436 may burn or support fire depending on the product and fire conditions. Keep ignition sources away and follow ERG 151.
Soluble in water, releasing hexafluoroacetone which is highly irritating and toxic
Level A or B required; full-face SCBA, chemical-resistant suit, butyl rubber gloves; avoid all skin contact
ERG 151: isolate spill 25m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
Dry chemical, CO2, or dry sand; water spray may be used to dilute spills but generates toxic vapors
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.