☣️ UN 2035 • CLASS 2
UN 2035 — Refrigerant gas R-143a
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 2035 Quick Details
UN 2035
Product name: Refrigerant gas R-143a
DOT Class: 2
Placard type: Flammable Gas
ERG Guide: 115 (check current ERG)
Initial isolation: ERG 115: isolate 100m all directions initially; if tank/rail car involved in fire isolate 800m and evacuate 1600m
Common Hazards of UN 2035
- 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 | 1,1,1-TrifluoroethaneHFC-143aTrifluoroethaneMethylfluoroformCF3CH3 |
| CAS Number | 420-46-2 |
| Appearance | Colorless, odorless liquefied gas under pressure. Shipped as a liquefied compressed gas. |
| Flash Point | Not applicable (gas) |
| Boiling Point | -47C (-53F) |
| Vapor Density | 2.9 (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 2035
Extinguishing Media
CO2, dry chemical, water spray for cooling containers only
PPE Requirements
⚠️ Level B minimum with SCBA; insulated gloves for cryogenic exposure; Level A if fire or major leak
Isolation & Evacuation
ERG 115: isolate 100m all directions initially; if tank/rail car involved in fire isolate 800m and evacuate 1600m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 115).
First Actions for a UN 2035 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 2035 — Refrigerant gas R-143aHAZMAT RADIO NOTE — UN 2035
Product: Refrigerant gas R-143a
Class 2 / Flammable Gas / ERG 115
PPE: Level B minimum with SCBA; insulated gloves for cryogenic exposure; Level A if fire or major leak
ISOLATION: ERG 115: isolate 100m all directions initially; if tank/rail car involved in fire isolate 800m and evacuate 1600m
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 2035 — Refrigerant gas R-143a
Class: 2 | Placard: Flammable Gas | ERG Guide: 115
Appearance: Colorless, odorless liquefied gas under pressure. Shipped as a liquefied compressed gas.
Water Reactivity: No significant reaction with water
Extinguishing: CO2, dry chemical, water spray for cooling containers only
PPE: Level B minimum with SCBA; insulated gloves for cryogenic exposure; Level A if fire or major leak
Isolation: ERG 115: isolate 100m all directions initially; if tank/rail car involved in fire isolate 800m and evacuate 1600m
— 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/2035 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2035 Refrigerant gas R-143a Cls2 ERG115 | ERG 115: isolate 100m all directions initially; if tank/rail car involved in fir | allfirefighter.com/hazmat/un/2035SMS / 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/2035
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Frequently Asked Questions about UN 2035
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 with SCBA; insulated gloves for cryogenic exposure; Level A if fire or major leak
Water reactivity: No significant reaction with water. Recommended extinguishing: CO2, dry chemical, water spray for cooling containers only.
ERG Guide 115 recommendation: ERG 115: isolate 100m all directions initially; if tank/rail car involved in fire isolate 800m and evacuate 1600m
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.