☣️ UN 1018 • CLASS 2
UN 1018 — Chlorodifluoromethane
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 1018 Quick Details
UN 1018
Product name: Chlorodifluoromethane
DOT Class: 2
Placard type: Non-Flammable Gas
ERG Guide: 126 (check current ERG)
Initial isolation: ERG 126: initial isolation 100m in all directions; protect from heat and fire sources; ventilate enclosed areas
Common Hazards of UN 1018
- 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 | HCFC-22R-22Freon 22DifluoromonochloromethaneCHClF2 |
| CAS Number | 75-45-6 |
| Appearance | Colorless gas with a faint, sweetish odor. Shipped as a liquefied compressed gas under its own vapor pressure. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | -40.8C (-41.4F) |
| Vapor Density | 3.0 (heavier than air) |
| Water Reactivity | No significant reaction with water |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1018
Extinguishing Media
Not applicable (non-flammable gas); use water spray to cool containers
PPE Requirements
⚠️ Level B minimum in confined spaces; SCBA if leak or confined area; thermal gloves for frostbite protection
Isolation & Evacuation
ERG 126: initial isolation 100m in all directions; protect from heat and fire sources; ventilate enclosed areas
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 126).
First Actions for a UN 1018 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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📋 Copy & Share Field Card
UN 1018 — ChlorodifluoromethaneHAZMAT RADIO NOTE — UN 1018
Product: Chlorodifluoromethane
Class 2 / Non-Flammable Gas / ERG 126
PPE: Level B minimum in confined spaces; SCBA if leak or confined area; thermal gloves for frostbite protection
ISOLATION: ERG 126: initial isolation 100m in all directions; protect from heat and fire sources; ventilate enclosed areas
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 1018 — Chlorodifluoromethane
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 126
Appearance: Colorless gas with a faint, sweetish odor. Shipped as a liquefied compressed gas under its own vapor pressure.
Water Reactivity: No significant reaction with water
Extinguishing: Not applicable (non-flammable gas); use water spray to cool containers
PPE: Level B minimum in confined spaces; SCBA if leak or confined area; thermal gloves for frostbite protection
Isolation: ERG 126: initial isolation 100m in all directions; protect from heat and fire sources; ventilate enclosed areas
— 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/1018 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1018 Chlorodifluoromethane Cls2 ERG126 | ERG 126: initial isolation 100m in all directions; protect from heat and fire so | allfirefighter.com/hazmat/un/1018SMS / 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/1018
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Frequently Asked Questions about UN 1018
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 in confined spaces; SCBA if leak or confined area; thermal gloves for frostbite protection
Water reactivity: No significant reaction with water. Recommended extinguishing: Not applicable (non-flammable gas); use water spray to cool containers.
ERG Guide 126 recommendation: ERG 126: initial isolation 100m in all directions; protect from heat and fire sources; ventilate enclosed areas
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.