☣️ UN 2599 • CLASS 2
UN 2599 — Chlorotrifluoromethane and trifluoromethane azeotropic mixture with approximately 60% chlorotrifluoromethane
Placard: Non-Flammable Gas. ERG Guide 126. 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 2599 Quick Details
UN 2599
Product name: Chlorotrifluoromethane and trifluoromethane azeotropic mixture with approximately 60% chlorotrifluoromethane
DOT Class: 2
Placard type: Non-Flammable Gas
ERG Guide: 126 (check current ERG)
Initial isolation: ERG 126: Initial isolation 100m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation
Common Hazards of UN 2599
- Some may burn but none ignite readily.
- Containers may explode when heated.
- Ruptured cylinders may rocket.
- 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 or liquefied gas may cause burns, severe injury and/or frostbite.
- Fire may produce irritating, corrosive and/or toxic gases.
Chemical Identity & Physical Properties
| Also known as | CFC-13/R-23 azeotropeR-503Refrigerant 503Chlorotrifluoromethane/Trifluoromethane mixture |
| Appearance | Colorless liquefied compressed gas with a faint ethereal odor. Stored under pressure in cylinders. Heavier than air as a gas. |
| Flash Point | Not applicable (non-flammable compressed gas) |
| Boiling Point | Approximately -88°C (-126°F) at atmospheric pressure |
| Vapor Density | 3.8 (heavier than air) |
| Water Reactivity | No significant reaction with water; low solubility in water |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2599
Extinguishing Media
CO2, dry chemical, water spray for cooling cylinders; foam not typically required for non-flammable gas
PPE Requirements
⚠️ Level B minimum; SCBA required in confined spaces or high concentrations due to asphyxiation hazard; chemical-resistant gloves for liquid contact to prevent frostbite
Isolation & Evacuation
ERG 126: Initial isolation 100m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 126).
First Actions for a UN 2599 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 500 meters (1/3 mile).
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UN 2599 — Chlorotrifluoromethane and trifluoromethHAZMAT RADIO NOTE — UN 2599
Product: Chlorotrifluoromethane and trifluoromethane azeotropic mixture with approximately 60% chlorotrifluoromethane
Class 2 / Non-Flammable Gas / ERG 126
PPE: Level B minimum; SCBA required in confined spaces or high concentrations due to asphyxiation hazard; chemical-resistant gloves for liquid contact to prevent frostbite
ISOLATION: ERG 126: Initial isolation 100m in all directions; if tank/rail car involved in fire, isolate 800m in all directions 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 2599 — Chlorotrifluoromethane and trifluoromethane azeotropic mixture with approximately 60% chlorotrifluoromethane
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 126
Appearance: Colorless liquefied compressed gas with a faint ethereal odor. Stored under pressure in cylinders. Heavier than air as a gas.
Water Reactivity: No significant reaction with water; low solubility in water
Extinguishing: CO2, dry chemical, water spray for cooling cylinders; foam not typically required for non-flammable gas
PPE: Level B minimum; SCBA required in confined spaces or high concentrations due to asphyxiation hazard; chemical-resistant gloves for liquid contact to prevent frostbite
Isolation: ERG 126: Initial isolation 100m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation
— Key Hazards —
• Some may burn but none ignite readily.
• Containers may explode when heated.
• Ruptured cylinders may rocket.
— 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/2599 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2599 Chlorotrifluoromethane and trifluoromethane azeotropic mixture with approximately 60% chlorotrifluoromethane Cls2 ERG126 | allfirefighter.com/hazmat/un/2599SMS / 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/2599
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Frequently Asked Questions about UN 2599
Some may burn but none ignite readily. Containers may explode when heated. Ruptured cylinders may rocket. 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 or liquefied gas may cause burns, severe injury and/or frostbite. Fire may produce irritating, corrosive and/or toxic gases.
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 due to asphyxiation hazard; chemical-resistant gloves for liquid contact to prevent frostbite
Water reactivity: No significant reaction with water; low solubility in water. Recommended extinguishing: CO2, dry chemical, water spray for cooling cylinders; foam not typically required for non-flammable gas.
ERG Guide 126 recommendation: ERG 126: Initial isolation 100m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 126 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.