☣️ UN 1954 • CLASS 2
UN 1954 — Refrigerant gases, n.o.s. (flammable)
Placard: Flammable Gas. ERG Guide 115. 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 1954 Quick Details
UN 1954
Product name: Refrigerant gases, n.o.s. (flammable)
DOT Class: 2
Placard type: Flammable Gas
ERG Guide: 115 (check current ERG)
Initial isolation: ERG 115: isolate 100m all directions; evacuate 800m downwind if large spill or fire; eliminate ignition sources
Common Hazards of UN 1954
- 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.
Chemical Identity & Physical Properties
| Also known as | Compressed refrigerant gasFlammable refrigerant mixtureLiquefied refrigerant gasHydrocarbon refrigerantsR-series flammable refrigerants |
| Appearance | Colorless to slightly odorless compressed or liquefied gas at room temperature. May have a faint hydrocarbon odor depending on specific refrigerant composition. |
| Flash Point | Not applicable (flammable gas) |
| Boiling Point | Variable depending on specific refrigerant; typically -50C to 0C (-58F to 32F) for common flammable refrigerants |
| Vapor Density | Heavier than air (typically 1.5-3.0 relative to air) |
| Water Reactivity | No significant reaction with water; gas may dissolve slightly |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1954
Extinguishing Media
Dry chemical, CO2; stop flow if possible; water spray for cooling containers only
PPE Requirements
⚠️ Level B minimum with SCBA; thermal protection if fire exposure; cryogenic gloves for liquid contact
Isolation & Evacuation
ERG 115: isolate 100m all directions; evacuate 800m downwind if large spill or fire; eliminate ignition sources
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 115).
First Actions for a UN 1954 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
- 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 1954 — Refrigerant gases, n.o.s. (flammable)HAZMAT RADIO NOTE — UN 1954
Product: Refrigerant gases, n.o.s. (flammable)
Class 2 / Flammable Gas / ERG 115
PPE: Level B minimum with SCBA; thermal protection if fire exposure; cryogenic gloves for liquid contact
ISOLATION: ERG 115: isolate 100m all directions; evacuate 800m downwind if large spill or fire; eliminate ignition sources
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 1954 — Refrigerant gases, n.o.s. (flammable)
Class: 2 | Placard: Flammable Gas | ERG Guide: 115
Appearance: Colorless to slightly odorless compressed or liquefied gas at room temperature. May have a faint hydrocarbon odor depending on specific refrigerant composition.
Water Reactivity: No significant reaction with water; gas may dissolve slightly
Extinguishing: Dry chemical, CO2; stop flow if possible; water spray for cooling containers only
PPE: Level B minimum with SCBA; thermal protection if fire exposure; cryogenic gloves for liquid contact
Isolation: ERG 115: isolate 100m all directions; evacuate 800m downwind if large spill or fire; eliminate ignition sources
— 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/1954 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1954 Refrigerant gases, n.o.s. (flammable) Cls2 ERG115 | allfirefighter.com/hazmat/un/1954SMS / 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/1954
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Frequently Asked Questions about UN 1954
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 with SCBA; thermal protection if fire exposure; cryogenic gloves for liquid contact
Water reactivity: No significant reaction with water; gas may dissolve slightly. Recommended extinguishing: Dry chemical, CO2; stop flow if possible; water spray for cooling containers only.
ERG Guide 115 recommendation: ERG 115: isolate 100m all directions; evacuate 800m downwind if large spill or fire; eliminate ignition sources
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.