☣️ UN 2454 • CLASS 2
Refrigerant gas R-41
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 2454
Class: 2
Placard type: Flammable Gas
ERG: Guide 115 (check current ERG)
Isolation: ERG 115: isolate 800m all directions for large spill; evacuate 1600m downwind if tank/rail car involved in fire
Chemical & Response Details
| Also known as | FluoromethaneMethyl fluorideR-41Freon 41HFC-41 |
| CAS Number | 593-53-3 |
| Appearance | Colorless, odorless liquefied compressed gas. Shipped as a liquefied gas under its own vapor pressure. |
| Flash Point | Not applicable (gas) |
| Boiling Point | -78C (-108F) |
| Vapor Density | 1.2 (heavier than air) |
| Water Reactivity | No significant reaction with water |
| Extinguishing | CO2, dry chemical, water spray for cooling containers; no foam needed for gas fires |
| PPE | ⚠️ Level B minimum; SCBA required in confined spaces or high concentrations; insulated gloves for cryogenic liquid |
| Isolation | ERG 115: isolate 800m all directions for large spill; evacuate 1600m downwind if tank/rail car involved in fire |
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 2454 — Refrigerant gas R-41 HAZMAT RADIO NOTE — UN 2454
Product: Refrigerant gas R-41
Class 2 / Flammable Gas / ERG 115
PPE: Level B minimum; SCBA required in confined spaces or high concentrations; insulated gloves for cryogenic liquid
ISOLATION: ERG 115: isolate 800m all directions for large spill; evacuate 1600m downwind if tank/rail car involved in fire
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 2454 — Refrigerant gas R-41
Class: 2 | Placard: Flammable Gas | ERG Guide: 115
Appearance: Colorless, odorless liquefied compressed gas. Shipped as a liquefied gas under its own vapor pressure.
Water Reactivity: No significant reaction with water
Extinguishing: CO2, dry chemical, water spray for cooling containers; no foam needed for gas fires
PPE: Level B minimum; SCBA required in confined spaces or high concentrations; insulated gloves for cryogenic liquid
Isolation: ERG 115: isolate 800m all directions for large spill; evacuate 1600m downwind if tank/rail car involved in fire
— 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/2454 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2454 Refrigerant gas R-41 Cls2 ERG115 | ERG 115: isolate 800m all directions for large spill; evacuate 1600m downwind if | allfirefighter.com/hazmat/un/2454SMS / 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/2454
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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 confined spaces or high concentrations; insulated gloves for cryogenic liquid
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.