☣️ UN 3175 • CLASS 4
Solids containing flammable liquid, 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 3175
Class: 4
Placard type: Flammable Solid
ERG: Guide 133 (check current ERG)
Isolation: ERG 133: isolate spill/leak area 25m in all directions; if tank/rail car involved in fire, isolate 800m in all directions
Chemical & Response Details
| Also known as | Flammable solid with liquidSolid-liquid flammable mixtureWetted flammable solid |
| Appearance | Solid material impregnated, wetted, or containing flammable liquid. Appearance varies widely depending on specific composition; may be granular, fibrous, or solid mass. |
| Flash Point | Varies by composition; typically below 60C (140F) due to flammable liquid content |
| Boiling Point | Not applicable (solid material with absorbed liquid) |
| Vapor Density | Not applicable (solid, though vapors from liquid component may be heavier than air) |
| Water Reactivity | Generally no significant reaction, but water may release absorbed flammable liquid |
| Extinguishing | Dry chemical, CO2, water spray (use caution as water may spread liquid), foam may be used |
| PPE | ⚠️ Level C minimum for non-fire situations; Level B with SCBA for fire or high vapor concentrations |
| Isolation | ERG 133: isolate spill/leak area 25m in all directions; if tank/rail car involved in fire, isolate 800m in all directions |
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 3175 — Solids containing flammable liquid, n.o. HAZMAT RADIO NOTE — UN 3175
Product: Solids containing flammable liquid, n.o.s.
Class 4 / Flammable Solid / ERG 133
PPE: Level C minimum for non-fire situations; Level B with SCBA for fire or high vapor concentrations
ISOLATION: ERG 133: isolate spill/leak area 25m in all directions; if tank/rail car involved in fire, isolate 800m in all directions
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 3175 — Solids containing flammable liquid, n.o.s.
Class: 4 | Placard: Flammable Solid | ERG Guide: 133
Appearance: Solid material impregnated, wetted, or containing flammable liquid. Appearance varies widely depending on specific composition; may be granular, fibrous, or solid mass.
Water Reactivity: Generally no significant reaction, but water may release absorbed flammable liquid
Extinguishing: Dry chemical, CO2, water spray (use caution as water may spread liquid), foam may be used
PPE: Level C minimum for non-fire situations; Level B with SCBA for fire or high vapor concentrations
Isolation: ERG 133: isolate spill/leak area 25m in all directions; if tank/rail car involved in fire, isolate 800m in all directions
— 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/3175 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3175 Solids containing flammable liquid, n.o.s. Cls4 ERG133 | allfirefighter.com/hazmat/un/3175SMS / 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/3175
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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 C minimum for non-fire situations; Level B with SCBA for fire or high vapor concentrations
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.