☣️ UN 1028 • CLASS 2
UN 1028 — Dichlorodifluoromethane
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.
Dichlorodifluoromethane is a non-flammable gas that can cause severe burns and respiratory problems. It is shipped as a liquefied compressed gas under pressure and is non-flammable.
Hazard overview: Dichlorodifluoromethane some may burn but none ignite readily and containers may explode when heated. It can also cause severe burns and respiratory problems.
Response guidance: In case of emergency, evacuate the area and call the fire department. Use water spray to cool containers, CO2, dry chemical if needed for nearby fires.
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UN 1028 Quick Details
UN 1028
Product name: Dichlorodifluoromethane
DOT Class: 2
Placard type: Non-Flammable Gas
ERG Guide: 126 (check current ERG)
Initial isolation: ERG 126: isolate 100m all directions initially; protect from heat and open flame; evacuate if containers exposed to fire
Common Hazards of UN 1028
- 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
Dichlorodifluoromethane is a colorless, nearly odorless gas at room temperature.
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1028
Extinguishing Media
Non-flammable; water spray to cool containers, CO2, dry chemical if needed for nearby fires
PPE Requirements
⚠️ Level C minimum; SCBA if confined space or large leak; thermal gloves for cryogenic liquid contact
Level C minimum; SCBA if confined space or large leak; thermal gloves for cryogenic liquid contact
Isolation & Evacuation
ERG 126: isolate 100m all directions initially; protect from heat and open flame; evacuate if containers exposed to fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 126).
First Actions for a UN 1028 Incident
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- 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 1028 — DichlorodifluoromethaneHAZMAT 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 —
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• 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.
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.
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.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/dichlorodifluoromethane-un-1028
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Frequently Asked Questions about UN 1028
No, UN 1028 Dichlorodifluoromethane is not flammable.
Yes, use water spray to cool containers.
UN 1028 Dichlorodifluoromethane some may burn but none ignite readily and containers may explode when heated.
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.