☣️ UN 3176 • CLASS 4
Flammable solid, organic, molten, n.o.s.
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 3176
Class: 4
Placard type: Flammable Solid
ERG: Guide 133 (check current ERG)
Isolation: ERG 133: Initial isolation 50m in all directions; protective action distance 100m for large spill; thermal hazard perimeter based on material temperature
Chemical & Response Details
| Also known as | Molten organic flammable solidHeated flammable organic materialOrganic flammable solid N.O.S.Hot flammable organic substance |
| Appearance | Molten organic material maintained at elevated temperature above its melting point. Appearance varies depending on specific substance but typically viscous liquid state with potential vapors or fumes. |
| Flash Point | Not applicable (already molten and above ignition temperature) |
| Boiling Point | Variable depending on specific organic material |
| Vapor Density | Variable, typically heavier than air when vapors present |
| Water Reactivity | Generally no violent reaction, but water contact may cause violent boiling, spattering, and steam generation due to temperature differential |
| Extinguishing | Dry chemical, dry sand, soda ash; avoid water streams due to spattering risk |
| PPE | ⚠️ Level B minimum with thermal protection; SCBA required; heat-resistant gloves and face shield mandatory due to molten material hazard |
| Isolation | ERG 133: Initial isolation 50m in all directions; protective action distance 100m for large spill; thermal hazard perimeter based on material temperature |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Flammable/combustible material.
- May be ignited by friction, heat, sparks or flames.
- Some may burn rapidly with flare-burning effect.
- Powders, dusts, shavings, borings, turnings or cuttings may explode or burn with explosive violence.
- Substance may be transported in a molten form at a temperature that may be above its flash point.
- May re-ignite after fire is extinguished.
- Fire may produce irritating and/or toxic gases.
- Contact may cause burns to skin and eyes.
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 for at least 25 meters (75 feet) in all directions.
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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UN 3176 — Flammable solid, organic, molten, n.o.s. HAZMAT RADIO NOTE — UN 3176
Product: Flammable solid, organic, molten, n.o.s.
Class 4 / Flammable Solid / ERG 133
PPE: Level B minimum with thermal protection; SCBA required; heat-resistant gloves and face shield mandatory due to molten material hazard
ISOLATION: ERG 133: Initial isolation 50m in all directions; protective action distance 100m for large spill; thermal hazard perimeter based on material temperature
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 3176 — Flammable solid, organic, molten, n.o.s.
Class: 4 | Placard: Flammable Solid | ERG Guide: 133
Appearance: Molten organic material maintained at elevated temperature above its melting point. Appearance varies depending on specific substance but typically viscous liquid state with potential vapors or fumes.
Water Reactivity: Generally no violent reaction, but water contact may cause violent boiling, spattering, and steam generation due to temperature differential
Extinguishing: Dry chemical, dry sand, soda ash; avoid water streams due to spattering risk
PPE: Level B minimum with thermal protection; SCBA required; heat-resistant gloves and face shield mandatory due to molten material hazard
Isolation: ERG 133: Initial isolation 50m in all directions; protective action distance 100m for large spill; thermal hazard perimeter based on material temperature
— Key Hazards —
• Flammable/combustible material.
• May be ignited by friction, heat, sparks or flames.
• Some may burn rapidly with flare-burning effect.
— 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 for at least 25 meters (75 feet) in all directions.
SOURCE: allfirefighter.com/hazmat/un/3176 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3176 Flammable solid, organic, molten, n.o.s. Cls4 ERG133 | allfirefighter.com/hazmat/un/3176SMS / 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/3176
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FAQ
Flammable/combustible material. May be ignited by friction, heat, sparks or flames. Some may burn rapidly with flare-burning effect. Powders, dusts, shavings, borings, turnings or cuttings may explode or burn with explosive violence. Substance may be transported in a molten form at a temperature that may be above its flash point. May re-ignite after fire is extinguished. Fire may produce irritating and/or toxic gases. Contact may cause burns to skin and eyes.
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 thermal protection; SCBA required; heat-resistant gloves and face shield mandatory due to molten material hazard
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 133 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.