☣️ UN 3184 • CLASS 4
UN 3184 — Self-heating liquid, poisonous, organic, n.o.s.
Placard: Spontaneously Combustible. ERG Guide 136. 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 3184 Quick Details
UN 3184
Product name: Self-heating liquid, poisonous, organic, n.o.s.
DOT Class: 4
Placard type: Spontaneously Combustible
ERG Guide: 136 (check current ERG)
Initial isolation: ERG 136: isolate spill/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
Common Hazards of UN 3184
- Extremely flammable; will ignite itself if exposed to air.
- Burns rapidly, releasing dense, white, irritating fumes.
- Substance may be transported in a molten form.
- May re-ignite after fire is extinguished.
- Corrosives in contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated.
- Fire will produce irritating, corrosive and/or toxic gases.
- TOXIC and/or CORROSIVE; ingestion of substance or inhalation of decomposition products will cause
Chemical Identity & Physical Properties
| Also known as | Self-heating liquid, toxic, organic, n.o.s.Self-heating organic liquid, toxicPyrophoric organic liquid, toxic |
| Appearance | Varies by specific substance; typically a liquid that may spontaneously ignite when exposed to air at or below 54°C (130°F). May release dense white irritating fumes when burning. |
| Flash Point | Not applicable (self-heating/pyrophoric material) |
| Boiling Point | Varies by specific substance |
| Vapor Density | Varies by specific substance; typically heavier than air |
| Water Reactivity | May react with water; avoid water contact unless specified for the specific material |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3184
Extinguishing Media
Dry chemical, dry sand, soda ash; no water or foam on pyrophoric liquids
PPE Requirements
⚠️ Level A or B minimum; full encapsulation if material is pyrophoric; SCBA required; chemical-resistant suit
Isolation & Evacuation
ERG 136: isolate spill/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
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 136).
First Actions for a UN 3184 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Stay upwind, uphill and/or upstream.
- Keep unauthorized personnel away.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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UN 3184 — Self-heating liquid, poisonous, organic,HAZMAT RADIO NOTE — UN 3184
Product: Self-heating liquid, poisonous, organic, n.o.s.
Class 4 / Spontaneously Combustible / ERG 136
PPE: Level A or B minimum; full encapsulation if material is pyrophoric; SCBA required; chemical-resistant suit
ISOLATION: ERG 136: isolate spill/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 3184 — Self-heating liquid, poisonous, organic, n.o.s.
Class: 4 | Placard: Spontaneously Combustible | ERG Guide: 136
Appearance: Varies by specific substance; typically a liquid that may spontaneously ignite when exposed to air at or below 54°C (130°F). May release dense white irritating fumes when burning.
Water Reactivity: May react with water; avoid water contact unless specified for the specific material
Extinguishing: Dry chemical, dry sand, soda ash; no water or foam on pyrophoric liquids
PPE: Level A or B minimum; full encapsulation if material is pyrophoric; SCBA required; chemical-resistant suit
Isolation: ERG 136: isolate spill/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 —
• Extremely flammable; will ignite itself if exposed to air.
• Burns rapidly, releasing dense, white, irritating fumes.
• Substance may be transported in a molten form.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Stay upwind, uphill and/or upstream.
• Keep unauthorized personnel away.
• 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/3184 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3184 Self-heating liquid, poisonous, organic, n.o.s. Cls4 ERG136 | allfirefighter.com/hazmat/un/3184SMS / 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/3184
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Frequently Asked Questions about UN 3184
Extremely flammable; will ignite itself if exposed to air. Burns rapidly, releasing dense, white, irritating fumes. Substance may be transported in a molten form. May re-ignite after fire is extinguished. Corrosives in contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Fire will produce irritating, corrosive and/or toxic gases. TOXIC and/or CORROSIVE; ingestion of substance or inhalation of decomposition products will cause
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Stay upwind, uphill and/or upstream. Keep unauthorized personnel away.
Level A or B minimum; full encapsulation if material is pyrophoric; SCBA required; chemical-resistant suit
Water reactivity: May react with water; avoid water contact unless specified for the specific material. Recommended extinguishing: Dry chemical, dry sand, soda ash; no water or foam on pyrophoric liquids.
ERG Guide 136 recommendation: ERG 136: isolate spill/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
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 136 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.