☣️ UN 1028 • CLASS 2
Dichlorodifluoromethane
Placard: Non-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 1028
Class: 2
Placard type: Non-Flammable Gas
ERG: Guide 126 (check current ERG)
Isolation: ERG 126: isolate 100m all directions initially; protect from heat and open flame; evacuate if containers exposed to fire
Chemical & Response Details
| Also known as | R-12CFC-12Freon 12Refrigerant 12Arcton 12Genetron 12 |
| CAS Number | 75-71-8 |
| Appearance | Colorless, nearly odorless gas at room temperature. Non-flammable. Shipped as a liquefied compressed gas under pressure. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | -29.8C (-21.6F) |
| Vapor Density | 4.2 (heavier than air) |
| Water Reactivity | No significant reaction with water |
| Extinguishing | Non-flammable; water spray to cool containers, CO2, dry chemical if needed for nearby fires |
| PPE | ⚠️ Level C minimum; SCBA if confined space or large leak; thermal gloves for cryogenic liquid contact |
| Isolation | ERG 126: isolate 100m all directions initially; protect from heat and open flame; evacuate if containers exposed to fire |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
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
- 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 1028 — Dichlorodifluoromethane HAZMAT RADIO NOTE — UN 1028
Product: Dichlorodifluoromethane
Class 2 / Non-Flammable Gas / ERG 126
PPE: Level C minimum; SCBA if confined space or large leak; thermal gloves for cryogenic liquid contact
ISOLATION: ERG 126: isolate 100m all directions initially; protect from heat and open flame; evacuate if containers exposed to 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 1028 — Dichlorodifluoromethane
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 126
Appearance: Colorless, nearly odorless gas at room temperature. Non-flammable. Shipped as a liquefied compressed gas under pressure.
Water Reactivity: No significant reaction with water
Extinguishing: Non-flammable; water spray to cool containers, CO2, dry chemical if needed for nearby fires
PPE: Level C minimum; SCBA if confined space or large leak; thermal gloves for cryogenic liquid contact
Isolation: ERG 126: isolate 100m all directions initially; protect from heat and open flame; evacuate if containers exposed to fire
— 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/1028 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1028 Dichlorodifluoromethane Cls2 ERG126 | allfirefighter.com/hazmat/un/1028SMS / 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/1028
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FAQ
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 C minimum; SCBA if confined space or large leak; thermal gloves for cryogenic liquid contact
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.