☣️ UN 3296 • CLASS 2
UN 3296 — Refrigerant gas R-227
Placard: Non-Flammable Gas. ERG Guide 126. 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.
Refrigerant gas R-227 is a liquefied compressed refrigerant gas handled primarily as an asphyxiation, frostbite and pressure-container hazard.
Hazard overview: Released vapor can displace oxygen without warning, especially in confined spaces. Cylinders may rupture or rocket if heated, and liquid contact can cause frostbite.
Response guidance: Isolate the leak, ventilate from a safe position and cool exposed containers with water spray. Use SCBA in confined spaces or high concentrations and avoid direct contact with liquefied gas.
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UN 3296 Quick Details
UN 3296
Product name: Refrigerant gas R-227
DOT Class: 2
Placard type: Non-Flammable Gas
ERG Guide: 126 (check current ERG)
Initial isolation: ERG 126: Initial isolation 100m in all directions. Protect from heat sources. If tank/rail car involved in fire, isolate 800m in all directions.
Common Hazards of UN 3296
- Some may burn but none ignite readily.
- Containers may explode when heated.
- Ruptured cylinders may rocket.
- Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Fire may produce irritating, corrosive and/or toxic gases.
Chemical Identity & Physical Properties
Colorless, odorless liquefied compressed gas. Shipped as a liquefied gas under pressure. Heavier than air as a gas.
| Also known as | HeptafluoropropaneHFC-227eaFM-2001,1,1,2,3,3,3-HeptafluoropropaneFE-227 |
| CAS Number | 431-89-0 |
| Appearance | Colorless, odorless liquefied compressed gas. Shipped as a liquefied gas under pressure. Heavier than air as a gas. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | -16.4C (2.5F) |
| Vapor Density | 7.3 (heavier than air) |
| Water Reactivity | No significant reaction with water. Gas is soluble in water to a limited extent. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3296
Extinguishing Media
Not applicable for fire suppression. CO2 or dry chemical for surrounding fires. Water spray to cool containers.
PPE Requirements
⚠️ Level B minimum in leak scenarios. SCBA and full protective clothing if fire involvement. Cold protective gloves for liquid contact to prevent frostbite.
Level B minimum in leak scenarios. SCBA and full protective clothing if fire involvement. Cold protective gloves for liquid contact to prevent frostbite.
Isolation & Evacuation
ERG 126: Initial isolation 100m in all directions. Protect from heat sources. If tank/rail car involved in fire, isolate 800m in all directions.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 126).
First Actions for a UN 3296 Incident
- CALL 911, then contact the emergency response telephone number shown on shipping papers, if available.
- 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.
- Consider initial downwind evacuation for at least 500 meters (1/3 mile).
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📋 Copy & Share Field Card
UN 3296 — Refrigerant gas R-227HAZMAT RADIO NOTE — UN 3296
Product: Refrigerant gas R-227
Class 2 / Non-Flammable Gas / ERG 126
PPE: Level B minimum in leak scenarios. SCBA and full protective clothing if fire involvement. Cold protective gloves for liquid contact to prevent frostbite.
ISOLATION: ERG 126: Initial isolation 100m in all directions. Protect from heat sources. If tank/rail car involved in fire, isolate 800m in all directions.
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 3296 — Refrigerant gas R-227
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 126
Appearance: Colorless, odorless liquefied compressed gas. Shipped as a liquefied gas under pressure. Heavier than air as a gas.
Water Reactivity: No significant reaction with water. Gas is soluble in water to a limited extent.
Extinguishing: Not applicable for fire suppression. CO2 or dry chemical for surrounding fires. Water spray to cool containers.
PPE: Level B minimum in leak scenarios. SCBA and full protective clothing if fire involvement. Cold protective gloves for liquid contact to prevent frostbite.
Isolation: ERG 126: Initial isolation 100m in all directions. Protect from heat sources. If tank/rail car involved in fire, isolate 800m in all directions.
— Key Hazards —
• Some may burn but none ignite readily.
• Containers may explode when heated.
• Ruptured cylinders may rocket.
— First Actions —
• CALL 911, then contact the emergency response telephone number shown on shipping papers, if available.
• 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/refrigerant-gas-r-227-un-3296 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3296 Refrigerant gas R-227 Cls2 ERG126 | allfirefighter.com/hazmat/un/refrigerant-gas-r-227-un-3296SMS / 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/refrigerant-gas-r-227-un-3296
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Frequently Asked Questions about UN 3296
UN 3296 is Refrigerant gas R-227, assigned to ERG Guide 126 and placarded as Non-Flammable Gas.
The main concern is its non-flammable gas hazard, supported by ERG Guide 126 initial response guidance.
Yes, corrosive effects are possible. Avoid skin and eye contact and use chemical-resistant protection.
Gas can spread downwind, collect in low or confined areas, displace oxygen or create toxic exposure depending on the material.
Use caution. No significant reaction with water. Gas is soluble in water to a limited extent
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.