UN 1958 — Refrigerant gas R-114
Placard: Non-Flammable Gas. ERG Guide 126. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 1958 is Refrigerant gas R-114, a non-flammable liquefied compressed refrigerant gas assigned to ERG Guide 126. The main hazards are pressure, asphyxiation, frostbite and toxic decomposition in fire.
Hazard overview: UN 1958 presents cylinder rupture, heavy vapor, oxygen displacement, frostbite and toxic decomposition hazards.
Response guidance: For a UN 1958 incident, verify the product with shipping papers, container markings, SDS and ERG Guide 126. Establish incident command, isolate the area, stay upwind, control ignition or downwind hazards, cool exposed containers from a protected distance when appropriate and base entry decisions on monitoring and local SOP.
Firefighter training notes: Training for UN 1958 should emphasize pressure hazards, oxygen displacement, frostbite, cylinder rupture/rocket risk, ventilation and atmospheric monitoring. Use ERG 126, SDS and local SOP.
Regulatory context: Refrigerant gas R-114 is regulated as a hazardous material for transportation and emergency response purposes. Requirements for storage, workplace exposure, emergency planning, spill reporting and waste handling vary by exact product, concentration, quantity and jurisdiction. Verify current requirements through shipping papers, SDS, container markings and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.
Storage & handling: Refrigerant gas R-114 should be stored in compatible containers in a secure, cool, ventilated hazardous-material area according to SDS and local procedures.
UN 1958 Quick Details
Common Hazards of UN 1958
- NON-FLAMMABLE liquefied compressed refrigerant gas; pressure and asphyxiation hazards are primary.
- Heavy vapor may collect in low or confined areas and displace oxygen.
- Contact with liquefied gas may cause frostbite or cold burns.
- Containers may rupture or rocket when heated.
- Fire or hot surfaces may decompose refrigerant and produce toxic/corrosive gases.
- Vapor may cause dizziness or unconsciousness in poorly ventilated spaces.
- Specific refrigerant hazards should be confirmed from SDS.
Chemical Identity & Physical Properties
Colorless, odorless liquefied compressed gas. Heavier than air. Non-flammable under most conditions.
| Also known as | 1,2-DichlorotetrafluoroethaneCFC-114DichlorotetrafluoroethaneCryofluoraneGenetron 114 |
| CAS Number | 76-14-2 |
| Appearance | Colorless, odorless liquefied compressed gas. Heavier than air. Non-flammable under most conditions. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | 3.6°C (38.5°F) |
| Vapor Density | 5.9 (heavier than air) |
| Water Reactivity | No significant reaction with water |
Fireground Response Guidance — UN 1958
Extinguishing Media
PPE Requirements
Use SCBA and oxygen monitoring in confined or oxygen-deficient areas. Wear face shield, insulated or cryogenic gloves and protective clothing when liquefied or refrigerated gas contact is possible.
Isolation & Evacuation
First Actions for a UN 1958 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Avoid breathing gas, vapor, smoke or mist and avoid skin or eye contact.
- Do not touch damaged containers or spilled/released material unless properly trained and wearing appropriate protective equipment.
- Ventilate closed spaces before entering, but only if properly trained, equipped, monitored and authorized by incident command.
- Isolate the release area and expand the perimeter for fire involvement, cylinder heating, vapor accumulation, unknown gas identity or downwind exposure.
- Use ERG Guide 126, shipping papers, SDS, air monitoring and incident command for protective actions.
📋 Copy & Share Field Card
UN 1958 — Refrigerant gas R-114Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.