☣️ UN 2453 • CLASS 2
Refrigerant gas R-161
Placard: Flammable Gas. 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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Quick details
UN 2453
Class: 2
Placard type: Flammable Gas
ERG: Guide 115 (check current ERG)
Isolation: ERG 115: isolate 100m all directions; if tank/railcar involved in fire, isolate 800m and consider evacuation
Chemical & Response Details
| Also known as | Ethyl fluorideFluoroethaneMonofluoroethaneHFC-161R-161 |
| CAS Number | 353-36-6 |
| Appearance | Colorless, liquefied compressed gas with a faint ethereal odor. Shipped as a liquefied gas under pressure. |
| Flash Point | -50C (-58F) |
| Boiling Point | -37C (-35F) |
| Vapor Density | 1.7 (heavier than air) |
| Water Reactivity | No significant reaction with water |
| Extinguishing | Do not use water or foam; use CO2, dry chemical, or inert gas |
| PPE | ⚠️ Level B minimum; SCBA required in enclosed spaces; cold-protective clothing for handling liquefied gas |
| Isolation | ERG 115: isolate 100m all directions; if tank/railcar involved in fire, isolate 800m and consider evacuation |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- EXTREMELY FLAMMABLE.
- Will be easily ignited by heat, sparks or flames.
- Will form explosive mixtures with air.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Vapors may travel to source of ignition and flash back.
- Cylinders exposed to fire may vent and release flammable gas through pressure relief devices.
- Containers may explode when heated.
- Ruptured cylinders may rocket.
First actions (field-minded)
- 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
- Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
- Consider initial downwind evacuation for at least 800 meters (1/2 mile).
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UN 2453 — Refrigerant gas R-161 HAZMAT RADIO NOTE — UN 2453
Product: Refrigerant gas R-161
Class 2 / Flammable Gas / ERG 115
PPE: Level B minimum; SCBA required in enclosed spaces; cold-protective clothing for handling liquefied gas
ISOLATION: ERG 115: isolate 100m all directions; if tank/railcar 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 2453 — Refrigerant gas R-161
Class: 2 | Placard: Flammable Gas | ERG Guide: 115
Appearance: Colorless, liquefied compressed gas with a faint ethereal odor. Shipped as a liquefied gas under pressure.
Water Reactivity: No significant reaction with water
Extinguishing: Do not use water or foam; use CO2, dry chemical, or inert gas
PPE: Level B minimum; SCBA required in enclosed spaces; cold-protective clothing for handling liquefied gas
Isolation: ERG 115: isolate 100m all directions; if tank/railcar involved in fire, isolate 800m and consider evacuation
— Key Hazards —
• EXTREMELY FLAMMABLE.
• Will be easily ignited by heat, sparks or flames.
• Will form explosive mixtures with air.
— 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/2453 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2453 Refrigerant gas R-161 Cls2 ERG115 | ERG 115: isolate 100m all directions; if tank/railcar involved in fire, isolate | allfirefighter.com/hazmat/un/2453SMS / 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/2453
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FAQ
EXTREMELY FLAMMABLE. Will be easily ignited by heat, sparks or flames. Will form explosive mixtures with air. Vapors from liquefied gas are initially heavier than air and spread along ground. Vapors may travel to source of ignition and flash back. Cylinders exposed to fire may vent and release flammable gas through pressure relief devices. 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; SCBA required in enclosed spaces; cold-protective clothing for handling liquefied gas
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 115 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.