☣️ UN 3136 • CLASS 2
UN 3136 — Trifluoromethane, refrigerated liquid
Placard: Non-Flammable Gas. ERG Guide 120. 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 3136 Quick Details
UN 3136
Product name: Trifluoromethane, refrigerated liquid
DOT Class: 2
Placard type: Non-Flammable Gas
ERG Guide: 120 (check current ERG)
Initial isolation: ERG 120: Initial isolation 100m in all directions; protective action distance not specified for non-fire scenarios; ensure adequate ventilation
Common Hazards of UN 3136
- 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, liquefied gas or cryogenic liquids may cause burns, severe injury and/or frostbite.
- Non-flammable gases.
- Containers may explode when heated.
- Ruptured cylinders may rocket.
Chemical Identity & Physical Properties
| Also known as | HFC-23R-23FluoroformCHF3TrifluoromethaneRefrigerant 23Freon 23 |
| CAS Number | 75-46-7 |
| Appearance | Colorless, odorless liquefied compressed gas. Shipped as a cryogenic refrigerated liquid at extremely low temperatures. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | -82C (-116F) |
| Vapor Density | 2.4 (heavier than air) |
| Water Reactivity | No significant reaction with water |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3136
Extinguishing Media
Not applicable (non-flammable); use water spray to disperse vapors if needed
PPE Requirements
⚠️ Level B minimum for gas release; insulated gloves and face shield for cryogenic liquid contact; SCBA required in confined spaces or high concentrations due to asphyxiation risk
Isolation & Evacuation
ERG 120: Initial isolation 100m in all directions; protective action distance not specified for non-fire scenarios; ensure adequate ventilation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 120).
First Actions for a UN 3136 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 100 meters (330 feet).
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📋 Copy & Share Field Card
UN 3136 — Trifluoromethane, refrigerated liquidHAZMAT RADIO NOTE — UN 3136
Product: Trifluoromethane, refrigerated liquid
Class 2 / Non-Flammable Gas / ERG 120
PPE: Level B minimum for gas release; insulated gloves and face shield for cryogenic liquid contact; SCBA required in confined spaces or high concentrations due to asphyxiation risk
ISOLATION: ERG 120: Initial isolation 100m in all directions; protective action distance not specified for non-fire scenarios; ensure adequate ventilation
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 3136 — Trifluoromethane, refrigerated liquid
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 120
Appearance: Colorless, odorless liquefied compressed gas. Shipped as a cryogenic refrigerated liquid at extremely low temperatures.
Water Reactivity: No significant reaction with water
Extinguishing: Not applicable (non-flammable); use water spray to disperse vapors if needed
PPE: Level B minimum for gas release; insulated gloves and face shield for cryogenic liquid contact; SCBA required in confined spaces or high concentrations due to asphyxiation risk
Isolation: ERG 120: Initial isolation 100m in all directions; protective action distance not specified for non-fire scenarios; ensure adequate ventilation
— Key Hazards —
• 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, liquefied gas or cryogenic liquids 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/3136 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3136 Trifluoromethane, refrigerated liquid Cls2 ERG120 | allfirefighter.com/hazmat/un/3136SMS / 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/3136
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Frequently Asked Questions about UN 3136
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, liquefied gas or cryogenic liquids may cause burns, severe injury and/or frostbite. Non-flammable gases. Containers may explode when heated. Ruptured cylinders may rocket.
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 for gas release; insulated gloves and face shield for cryogenic liquid contact; SCBA required in confined spaces or high concentrations due to asphyxiation risk
Water reactivity: No significant reaction with water. Recommended extinguishing: Not applicable (non-flammable); use water spray to disperse vapors if needed.
ERG Guide 120 recommendation: ERG 120: Initial isolation 100m in all directions; protective action distance not specified for non-fire scenarios; ensure adequate ventilation
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 120 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.