☣️ UN 3228 • CLASS 4
Self-reactive solid type E
Placard: Flammable Solid. 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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Quick details
UN 3228
Class: 4
Placard type: Flammable Solid
ERG: Guide 149 (check current ERG)
Isolation: ERG 149: Initial isolation 100m in all directions; protective action distance 300m downwind during daytime, 800m at night; if fire or large spill, isolate 800m and evacuate 1600m downwind
Chemical & Response Details
| Also known as | Self-reactive solid type EOrganic peroxide type E solidSelf-accelerating decomposition materialSADM solid type E |
| Appearance | Varies widely - solid formulations of organic compounds that may be white, colored powders, granules, or crystalline materials at room temperature. Odor varies by specific compound. |
| Flash Point | Not applicable (self-reactive solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Generally no reaction with water, but may decompose in presence of moisture depending on specific formulation |
| Extinguishing | Water spray for cooling only, CO2, dry chemical powder; avoid direct application on decomposing material |
| PPE | ⚠️ Level B minimum recommended; SCBA and full protective clothing required; maintain distance due to decomposition/explosion risk |
| Isolation | ERG 149: Initial isolation 100m in all directions; protective action distance 300m downwind during daytime, 800m at night; if fire or large spill, isolate 800m and evacuate 1600m downwind |
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 3228 — Self-reactive solid type E HAZMAT RADIO NOTE — UN 3228
Product: Self-reactive solid type E
Class 4 / Flammable Solid / ERG 149
PPE: Level B minimum recommended; SCBA and full protective clothing required; maintain distance due to decomposition/explosion risk
ISOLATION: ERG 149: Initial isolation 100m in all directions; protective action distance 300m downwind during daytime, 800m at night; if fire or large spill, isolate 800m and evacuate 1600m downwind
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 3228 — Self-reactive solid type E
Class: 4 | Placard: Flammable Solid | ERG Guide: 149
Appearance: Varies widely - solid formulations of organic compounds that may be white, colored powders, granules, or crystalline materials at room temperature. Odor varies by specific compound.
Water Reactivity: Generally no reaction with water, but may decompose in presence of moisture depending on specific formulation
Extinguishing: Water spray for cooling only, CO2, dry chemical powder; avoid direct application on decomposing material
PPE: Level B minimum recommended; SCBA and full protective clothing required; maintain distance due to decomposition/explosion risk
Isolation: ERG 149: Initial isolation 100m in all directions; protective action distance 300m downwind during daytime, 800m at night; if fire or large spill, isolate 800m and evacuate 1600m downwind
— 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/3228 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3228 Self-reactive solid type E Cls4 ERG149 | allfirefighter.com/hazmat/un/3228SMS / 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/3228
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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 recommended; SCBA and full protective clothing required; maintain distance due to decomposition/explosion risk
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.