☣️ UN 3179 • CLASS 4
UN 3179 — Flammable solid, poisonous, inorganic, n.o.s.
Placard: Flammable Solid. ERG Guide 134. 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 3179 Quick Details
UN 3179
Product name: Flammable solid, poisonous, inorganic, n.o.s.
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 134 (check current ERG)
Initial isolation: ERG 134: isolate spill/leak area immediately for at least 25-50 meters in all directions; if tank/rail car involved in fire, isolate 800 meters in all directions
Common Hazards of UN 3179
- Flammable/combustible material.
- May be ignited by heat, sparks or flames.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
- Corrosives in contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated.
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
Chemical Identity & Physical Properties
| Also known as | Toxic flammable solid, inorganic, n.o.s.Flammable solid, toxic, inorganic, n.o.s.Poisonous flammable solid, inorganic, n.o.s. |
| Appearance | Generic classification covering various inorganic flammable solids with toxic properties. Physical appearance varies by specific substance; typically solid materials that may be powders, granules, or crystalline forms at room temperature. |
| Flash Point | Varies by specific substance; generally low flash point solids that ignite readily from heat, sparks, or flames |
| Boiling Point | Not applicable (varies by specific substance) |
| Vapor Density | Not applicable (solid, though vapors when heated may be heavier than air depending on substance) |
| Water Reactivity | Varies by specific substance; some may react with water producing flammable or toxic gases |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3179
Extinguishing Media
Dry chemical, sand, or earth; avoid water if substance is water-reactive; consult SDS for specific substance
PPE Requirements
⚠️ Level B minimum; SCBA required; chemical-resistant suit due to toxic properties; avoid all contact with skin and eyes
Isolation & Evacuation
ERG 134: isolate spill/leak area immediately for at least 25-50 meters in all directions; if tank/rail car involved in fire, isolate 800 meters in all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 134).
First Actions for a UN 3179 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.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- 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 3179 — Flammable solid, poisonous, inorganic, nHAZMAT RADIO NOTE — UN 3179
Product: Flammable solid, poisonous, inorganic, n.o.s.
Class 4 / Flammable Solid / ERG 134
PPE: Level B minimum; SCBA required; chemical-resistant suit due to toxic properties; avoid all contact with skin and eyes
ISOLATION: ERG 134: isolate spill/leak area immediately for at least 25-50 meters in all directions; if tank/rail car involved in fire, isolate 800 meters 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 3179 — Flammable solid, poisonous, inorganic, n.o.s.
Class: 4 | Placard: Flammable Solid | ERG Guide: 134
Appearance: Generic classification covering various inorganic flammable solids with toxic properties. Physical appearance varies by specific substance; typically solid materials that may be powders, granules, or crystalline forms at room temperature.
Water Reactivity: Varies by specific substance; some may react with water producing flammable or toxic gases
Extinguishing: Dry chemical, sand, or earth; avoid water if substance is water-reactive; consult SDS for specific substance
PPE: Level B minimum; SCBA required; chemical-resistant suit due to toxic properties; avoid all contact with skin and eyes
Isolation: ERG 134: isolate spill/leak area immediately for at least 25-50 meters in all directions; if tank/rail car involved in fire, isolate 800 meters in all directions
— Key Hazards —
• Flammable/combustible material.
• May be ignited by heat, sparks or flames.
• When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
— 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.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/3179 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3179 Flammable solid, poisonous, inorganic, n.o.s. Cls4 ERG134 | allfirefighter.com/hazmat/un/3179SMS / 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/3179
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Frequently Asked Questions about UN 3179
Flammable/combustible material. May be ignited by heat, sparks or flames. When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion Corrosives in contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
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 B minimum; SCBA required; chemical-resistant suit due to toxic properties; avoid all contact with skin and eyes
Water reactivity: Varies by specific substance; some may react with water producing flammable or toxic gases. Recommended extinguishing: Dry chemical, sand, or earth; avoid water if substance is water-reactive; consult SDS for specific substance.
ERG Guide 134 recommendation: ERG 134: isolate spill/leak area immediately for at least 25-50 meters in all directions; if tank/rail car involved in fire, isolate 800 meters in all directions
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 134 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.