☣️ UN 3229 • CLASS 4
Self-reactive liquid type F
Placard: Flammable Solid. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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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Quick details
UN 3229
Class: 4
Placard type: Flammable Solid
ERG: Guide 149 (check current ERG)
Isolation: ERG 149: isolate spill or leak area immediately for at least 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation for 800m
Chemical & Response Details
| Also known as | Self-reactive liquid type FOrganic peroxide type F liquidSelf-accelerating decomposition liquidSADL type F |
| Appearance | Variable appearance depending on specific formulation; typically a liquid at room temperature. May be colorless to colored, with characteristic odor depending on the organic compound. Represents a broad category of self-reactive organic liquids with lower hazard potential than types A-E. |
| Flash Point | Variable, typically >60C (140F) for type F classification, but depends on specific formulation |
| Boiling Point | Variable depending on specific chemical composition, typically 100-250C (212-482F) |
| Vapor Density | Variable, typically >1 (heavier than air) for most organic liquid formulations |
| Water Reactivity | Generally no violent reaction with water, but may be water-immiscible; avoid contamination as some formulations may be sensitive to moisture |
| Extinguishing | Dry chemical, CO2, water spray for cooling; foam may be used but compatibility depends on specific formulation |
| PPE | ⚠️ Level B minimum; SCBA required in fire or decomposition scenarios; heat-protective clothing for fire situations; keep containers cool with water spray from distance |
| Isolation | ERG 149: isolate spill or leak area immediately for at least 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation for 800m |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Self-decomposition, self-polymerization, or self-ignition may be triggered by heat, chemical
- May be ignited by heat, sparks or flames.
- Some may decompose explosively when heated or involved in a fire.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- May burn violently. Decomposition or polymerization may be self-accelerating and produce large
- Vapors or dust may form explosive mixtures with air.
- Inhalation or contact with vapors, substance or decomposition products may cause severe injury or
- May produce irritating, toxic and/or corrosive gases.
First actions (field-minded)
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- Consider initial evacuation for at least 250 meters (800 feet) in all directions.
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UN 3229 — Self-reactive liquid type F HAZMAT RADIO NOTE — UN 3229
Product: Self-reactive liquid type F
Class 4 / Flammable Solid / ERG 149
PPE: Level B minimum; SCBA required in fire or decomposition scenarios; heat-protective clothing for fire situations; keep containers cool with water spray from distance
ISOLATION: ERG 149: isolate spill or leak area immediately for at least 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation for 800m
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 3229 — Self-reactive liquid type F
Class: 4 | Placard: Flammable Solid | ERG Guide: 149
Appearance: Variable appearance depending on specific formulation; typically a liquid at room temperature. May be colorless to colored, with characteristic odor depending on the organic compound. Represents a broad category of self-reactive organic liquids with lower hazard potential than types A-E.
Water Reactivity: Generally no violent reaction with water, but may be water-immiscible; avoid contamination as some formulations may be sensitive to moisture
Extinguishing: Dry chemical, CO2, water spray for cooling; foam may be used but compatibility depends on specific formulation
PPE: Level B minimum; SCBA required in fire or decomposition scenarios; heat-protective clothing for fire situations; keep containers cool with water spray from distance
Isolation: ERG 149: isolate spill or leak area immediately for at least 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation for 800m
— Key Hazards —
• Self-decomposition, self-polymerization, or self-ignition may be triggered by heat, chemical
• May be ignited by heat, sparks or flames.
• Some may decompose explosively when heated or involved in a fire.
— 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.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/3229 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3229 Self-reactive liquid type F Cls4 ERG149 | allfirefighter.com/hazmat/un/3229SMS / 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/3229
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FAQ
Self-decomposition, self-polymerization, or self-ignition may be triggered by heat, chemical May be ignited by heat, sparks or flames. Some may decompose explosively when heated or involved in a fire. Those substances designated with a (P) may polymerize explosively when heated or involved in a fire. May burn violently. Decomposition or polymerization may be self-accelerating and produce large Vapors or dust may form explosive mixtures with air. Inhalation or contact with vapors, substance or decomposition products may cause severe injury or May produce irritating, toxic and/or corrosive gases.
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 fire or decomposition scenarios; heat-protective clothing for fire situations; keep containers cool with water spray from distance
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 149 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.