☣️ UN 1964 • CLASS 2
UN 1964 — Hydrocarbon gas mixture, compressed, n.o.s.
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 1964 Quick Details
UN 1964
Product name: Hydrocarbon gas mixture, compressed, n.o.s.
DOT Class: 2
Placard type: Flammable Gas
ERG Guide: 115 (check current ERG)
Initial isolation: ERG 115: Initial isolation 100m all directions; protective action distance 800m downwind for large spills during day
Common Hazards of UN 1964
- 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 | Compressed hydrocarbon gasLPG mixtureFuel gas mixtureCompressed petroleum gas mixtureHydrocarbon gas NOS |
| Appearance | Colorless to pale yellow compressed gas with characteristic hydrocarbon or petroleum-like odor. Stored under pressure as liquefied gas; heavier than air when released. |
| Flash Point | Not applicable (compressed flammable gas) |
| Boiling Point | Variable depending on composition; typically -42°C to -1°C (-44°F to 30°F) for common LPG mixtures |
| Vapor Density | 1.5-2.0 (heavier than air; vapors will accumulate in low areas) |
| Water Reactivity | No reaction with water; gas is insoluble and will separate |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1964
Extinguishing Media
Water spray to cool containers, dry chemical, CO2; do not extinguish flowing gas fire unless source can be shut off
PPE Requirements
⚠️ Level B minimum with SCBA required; insulated gloves for contact with liquefied gas to prevent frostbite
Isolation & Evacuation
ERG 115: Initial isolation 100m all directions; protective action distance 800m downwind for large spills during day
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 115).
First Actions for a UN 1964 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 1964 — Hydrocarbon gas mixture, compressed, n.oHAZMAT RADIO NOTE — UN 1964
Product: Hydrocarbon gas mixture, compressed, n.o.s.
Class 2 / Flammable Gas / ERG 115
PPE: Level B minimum with SCBA required; insulated gloves for contact with liquefied gas to prevent frostbite
ISOLATION: ERG 115: Initial isolation 100m all directions; protective action distance 800m downwind for large spills during day
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 1964 — Hydrocarbon gas mixture, compressed, n.o.s.
Class: 2 | Placard: Flammable Gas | ERG Guide: 115
Appearance: Colorless to pale yellow compressed gas with characteristic hydrocarbon or petroleum-like odor. Stored under pressure as liquefied gas; heavier than air when released.
Water Reactivity: No reaction with water; gas is insoluble and will separate
Extinguishing: Water spray to cool containers, dry chemical, CO2; do not extinguish flowing gas fire unless source can be shut off
PPE: Level B minimum with SCBA required; insulated gloves for contact with liquefied gas to prevent frostbite
Isolation: ERG 115: Initial isolation 100m all directions; protective action distance 800m downwind for large spills during day
— 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/1964 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1964 Hydrocarbon gas mixture, compressed, n.o.s. Cls2 ERG115 | allfirefighter.com/hazmat/un/1964SMS / 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/1964
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Frequently Asked Questions about UN 1964
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 required; insulated gloves for contact with liquefied gas to prevent frostbite
Water reactivity: No reaction with water; gas is insoluble and will separate. Recommended extinguishing: Water spray to cool containers, dry chemical, CO2; do not extinguish flowing gas fire unless source can be shut off.
ERG Guide 115 recommendation: ERG 115: Initial isolation 100m all directions; protective action distance 800m downwind for large spills during day
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.