☣️ UN 3159 • CLASS 2
UN 3159 — 1,1,1,2-Tetrafluoroethane
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.
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UN 3159 Quick Details
UN 3159
Product name: 1,1,1,2-Tetrafluoroethane
DOT Class: 2
Placard type: Non-Flammable Gas
ERG Guide: 126 (check current ERG)
Initial isolation: ERG 126: isolate 100m all directions; if tank/rail car involved in fire, isolate 800m all directions
Common Hazards of UN 3159
- 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
| Also known as | R-134aHFC-134aNorfluraneFreon 134a1,1,1,2-Tetrafluoroethane |
| CAS Number | 811-97-2 |
| Appearance | Colorless, odorless liquefied gas. Shipped as a liquefied compressed gas under its own vapor pressure. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | -26C (-15F) |
| Vapor Density | 3.6 (heavier than air) |
| Water Reactivity | No significant reaction; low water solubility |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3159
Extinguishing Media
Not applicable (non-flammable); ventilate area, water spray to disperse vapors
PPE Requirements
⚠️ Level B minimum; SCBA if confined space or leak; insulated gloves for liquefied gas exposure
Isolation & Evacuation
ERG 126: isolate 100m all directions; if tank/rail car involved in fire, isolate 800m all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 126).
First Actions for a UN 3159 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.
- Consider initial downwind evacuation for at least 500 meters (1/3 mile).
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📋 Copy & Share Field Card
UN 3159 — 1,1,1,2-TetrafluoroethaneHAZMAT RADIO NOTE — UN 3159
Product: 1,1,1,2-Tetrafluoroethane
Class 2 / Non-Flammable Gas / ERG 126
PPE: Level B minimum; SCBA if confined space or leak; insulated gloves for liquefied gas exposure
ISOLATION: ERG 126: isolate 100m all directions; if tank/rail car involved in fire, isolate 800m 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 3159 — 1,1,1,2-Tetrafluoroethane
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 126
Appearance: Colorless, odorless liquefied gas. Shipped as a liquefied compressed gas under its own vapor pressure.
Water Reactivity: No significant reaction; low water solubility
Extinguishing: Not applicable (non-flammable); ventilate area, water spray to disperse vapors
PPE: Level B minimum; SCBA if confined space or leak; insulated gloves for liquefied gas exposure
Isolation: ERG 126: isolate 100m all directions; if tank/rail car involved in fire, isolate 800m 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 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/3159 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3159 1,1,1,2-Tetrafluoroethane Cls2 ERG126 | allfirefighter.com/hazmat/un/3159SMS / 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/3159
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Frequently Asked Questions about UN 3159
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.
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 B minimum; SCBA if confined space or leak; insulated gloves for liquefied gas exposure
Water reactivity: No significant reaction; low water solubility. Recommended extinguishing: Not applicable (non-flammable); ventilate area, water spray to disperse vapors.
ERG Guide 126 recommendation: ERG 126: isolate 100m all directions; if tank/rail car involved in fire, isolate 800m all directions
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 126 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.