☣️ UN 3529 • CLASS 2
UN 3529 — Machinery, internal combustion, flammable gas powered
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 3529 Quick Details
UN 3529
Product name: Machinery, internal combustion, flammable gas powered
DOT Class: 2
Placard type: Flammable Gas
ERG Guide: 115 (check current ERG)
Initial isolation: ERG 115: Initial isolation 100m in all directions; if tank/cylinder involved in fire, isolate 800m and consider evacuation
Common Hazards of UN 3529
- 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 | Flammable gas powered machineryInternal combustion engine equipmentGas-powered vehicles or equipmentLPG-powered machineryPropane-powered equipment |
| Appearance | Machinery or equipment containing internal combustion engines powered by flammable gases such as propane, butane, or natural gas. Physical appearance varies widely depending on the type of equipment (forklifts, generators, vehicles). The hazard relates to the fuel system and residual flammable gas. |
| Flash Point | Not applicable (machinery item containing flammable gas fuel) |
| Boiling Point | Not applicable (machinery item) |
| Vapor Density | Not applicable (machinery item; fuel gas typically 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 3529
Extinguishing Media
Dry chemical, CO2, or water spray for cooling; AFFF foam may be used on surrounding fires
PPE Requirements
⚠️ Level D minimum for intact machinery; Level C with SCBA if fuel leak or fire conditions exist; fire-resistant clothing if fire involvement
Isolation & Evacuation
ERG 115: Initial isolation 100m in all directions; if tank/cylinder involved in fire, isolate 800m and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 115).
First Actions for a UN 3529 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 3529 — Machinery, internal combustion, flammablHAZMAT RADIO NOTE — UN 3529
Product: Machinery, internal combustion, flammable gas powered
Class 2 / Flammable Gas / ERG 115
PPE: Level D minimum for intact machinery; Level C with SCBA if fuel leak or fire conditions exist; fire-resistant clothing if fire involvement
ISOLATION: ERG 115: Initial isolation 100m in all directions; if tank/cylinder involved in fire, isolate 800m and consider evacuation
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 3529 — Machinery, internal combustion, flammable gas powered
Class: 2 | Placard: Flammable Gas | ERG Guide: 115
Appearance: Machinery or equipment containing internal combustion engines powered by flammable gases such as propane, butane, or natural gas. Physical appearance varies widely depending on the type of equipment (forklifts, generators, vehicles). The hazard relates to the fuel system and residual flammable gas.
Water Reactivity: No significant reaction with water
Extinguishing: Dry chemical, CO2, or water spray for cooling; AFFF foam may be used on surrounding fires
PPE: Level D minimum for intact machinery; Level C with SCBA if fuel leak or fire conditions exist; fire-resistant clothing if fire involvement
Isolation: ERG 115: Initial isolation 100m in all directions; if tank/cylinder involved in fire, isolate 800m and consider evacuation
— 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/3529 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3529 Machinery, internal combustion, flammable gas powered Cls2 ERG115 | allfirefighter.com/hazmat/un/3529SMS / 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/3529
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Frequently Asked Questions about UN 3529
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 D minimum for intact machinery; Level C with SCBA if fuel leak or fire conditions exist; fire-resistant clothing if fire involvement
Water reactivity: No significant reaction with water. Recommended extinguishing: Dry chemical, CO2, or water spray for cooling; AFFF foam may be used on surrounding fires.
ERG Guide 115 recommendation: ERG 115: Initial isolation 100m in all directions; if tank/cylinder involved in fire, isolate 800m and consider evacuation
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.