☣️ UN 2517 • CLASS 2
UN 2517 — 1-Chloro-1,1-difluoroethane
Placard: Flammable Gas. ERG Guide 115. 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 2517 Quick Details
UN 2517
Product name: 1-Chloro-1,1-difluoroethane
DOT Class: 2
Placard type: Flammable Gas
ERG Guide: 115 (check current ERG)
Initial isolation: ERG 115: isolate 100m all directions; evacuate 800m downwind if large spill or fire
Common Hazards of UN 2517
- EXTREMELY FLAMMABLE.
- Will be easily ignited by heat, sparks or flames.
- Will form explosive mixtures with air.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Vapors may travel to source of ignition and flash back.
- Cylinders exposed to fire may vent and release flammable gas through pressure relief devices.
- Containers may explode when heated.
- Ruptured cylinders may rocket.
Chemical Identity & Physical Properties
| Also known as | HCFC-142bChlorodifluoroethaneFreon 142bR-142b1,1-Difluoro-1-chloroethane |
| CAS Number | 75-68-3 |
| Appearance | Colorless gas or liquefied compressed gas with a faint ethereal odor. Shipped as a liquefied gas under pressure. |
| Flash Point | -58C (-73F) |
| Boiling Point | -9C (16F) |
| Vapor Density | 3.4 (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 2517
Extinguishing Media
CO2, dry chemical, water spray for cooling containers; foam not typically required for gas
PPE Requirements
⚠️ Level B minimum; SCBA required in enclosed spaces or heavy vapor areas; thermal protective clothing if fire exposure
Isolation & Evacuation
ERG 115: isolate 100m all directions; evacuate 800m downwind if large spill or fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 115).
First Actions for a UN 2517 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
- Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
- Consider initial downwind evacuation for at least 800 meters (1/2 mile).
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📋 Copy & Share Field Card
UN 2517 — 1-Chloro-1,1-difluoroethaneHAZMAT RADIO NOTE — UN 2517
Product: 1-Chloro-1,1-difluoroethane
Class 2 / Flammable Gas / ERG 115
PPE: Level B minimum; SCBA required in enclosed spaces or heavy vapor areas; thermal protective clothing if fire exposure
ISOLATION: ERG 115: isolate 100m all directions; evacuate 800m downwind if large spill or 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 2517 — 1-Chloro-1,1-difluoroethane
Class: 2 | Placard: Flammable Gas | ERG Guide: 115
Appearance: Colorless gas or liquefied compressed gas with a faint ethereal odor. Shipped as a liquefied gas under pressure.
Water Reactivity: No significant reaction with water
Extinguishing: CO2, dry chemical, water spray for cooling containers; foam not typically required for gas
PPE: Level B minimum; SCBA required in enclosed spaces or heavy vapor areas; thermal protective clothing if fire exposure
Isolation: ERG 115: isolate 100m all directions; evacuate 800m downwind if large spill or fire
— Key Hazards —
• EXTREMELY FLAMMABLE.
• Will be easily ignited by heat, sparks or flames.
• Will form explosive mixtures with air.
— 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/2517 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2517 1-Chloro-1,1-difluoroethane Cls2 ERG115 | allfirefighter.com/hazmat/un/2517SMS / 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/2517
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Frequently Asked Questions about UN 2517
EXTREMELY FLAMMABLE. Will be easily ignited by heat, sparks or flames. Will form explosive mixtures with air. Vapors from liquefied gas are initially heavier than air and spread along ground. Vapors may travel to source of ignition and flash back. Cylinders exposed to fire may vent and release flammable gas through pressure relief devices. Containers may explode when heated. Ruptured cylinders may rocket.
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 enclosed spaces or heavy vapor areas; thermal protective clothing if fire exposure
Water reactivity: No significant reaction with water. Recommended extinguishing: CO2, dry chemical, water spray for cooling containers; foam not typically required for gas.
ERG Guide 115 recommendation: ERG 115: isolate 100m all directions; evacuate 800m downwind if large spill or fire
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 115 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.