☣️ UN 2926 • CLASS 4
UN 2926 — Flammable solid, poisonous, organic, 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 2926 Quick Details
UN 2926
Product name: Flammable solid, poisonous, organic, n.o.s.
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 134 (check current ERG)
Initial isolation: ERG 134: Initial isolation 50m in all directions; for large spills isolate 100m in all directions; if tank/rail car is involved in fire, isolate 800m in all directions and consider initial evacuation
Common Hazards of UN 2926
- 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 solidPoisonous flammable solid organicFlammable toxic solid n.o.s.UN2926 |
| Appearance | Variable appearance depending on specific substance; typically a solid material at room temperature that may be in powder, granular, or crystalline form. Color and odor vary by specific compound. |
| Flash Point | Not applicable (solid material; ignition temperature varies by specific substance) |
| Boiling Point | Not applicable (varies by specific substance; many decompose before boiling) |
| Vapor Density | Not applicable (solid material; vapor density depends on specific substance when heated) |
| Water Reactivity | Variable depending on specific substance; generally no violent reaction but material remains toxic and flammable |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2926
Extinguishing Media
Dry chemical, CO2, sand, or earth; avoid water streams that may spread material; foam may be used to reduce vapors
PPE Requirements
⚠️ Level B minimum recommended; SCBA with full face piece operated in positive pressure mode; chemical-resistant clothing and gloves required due to toxic properties
Isolation & Evacuation
ERG 134: Initial isolation 50m in all directions; for large spills isolate 100m in all directions; if tank/rail car is involved in fire, isolate 800m in all directions and consider initial evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 134).
First Actions for a UN 2926 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 2926 — Flammable solid, poisonous, organic, n.oHAZMAT RADIO NOTE — UN 2926
Product: Flammable solid, poisonous, organic, n.o.s.
Class 4 / Flammable Solid / ERG 134
PPE: Level B minimum recommended; SCBA with full face piece operated in positive pressure mode; chemical-resistant clothing and gloves required due to toxic properties
ISOLATION: ERG 134: Initial isolation 50m in all directions; for large spills isolate 100m in all directions; if tank/rail car is involved in fire, isolate 800m in all directions and consider initial evacuation
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 2926 — Flammable solid, poisonous, organic, n.o.s.
Class: 4 | Placard: Flammable Solid | ERG Guide: 134
Appearance: Variable appearance depending on specific substance; typically a solid material at room temperature that may be in powder, granular, or crystalline form. Color and odor vary by specific compound.
Water Reactivity: Variable depending on specific substance; generally no violent reaction but material remains toxic and flammable
Extinguishing: Dry chemical, CO2, sand, or earth; avoid water streams that may spread material; foam may be used to reduce vapors
PPE: Level B minimum recommended; SCBA with full face piece operated in positive pressure mode; chemical-resistant clothing and gloves required due to toxic properties
Isolation: ERG 134: Initial isolation 50m in all directions; for large spills isolate 100m in all directions; if tank/rail car is involved in fire, isolate 800m in all directions and consider initial evacuation
— 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/2926 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2926 Flammable solid, poisonous, organic, n.o.s. Cls4 ERG134 | allfirefighter.com/hazmat/un/2926SMS / 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/2926
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Frequently Asked Questions about UN 2926
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 recommended; SCBA with full face piece operated in positive pressure mode; chemical-resistant clothing and gloves required due to toxic properties
Water reactivity: Variable depending on specific substance; generally no violent reaction but material remains toxic and flammable. Recommended extinguishing: Dry chemical, CO2, sand, or earth; avoid water streams that may spread material; foam may be used to reduce vapors.
ERG Guide 134 recommendation: ERG 134: Initial isolation 50m in all directions; for large spills isolate 100m in all directions; if tank/rail car is involved in fire, isolate 800m in all directions and consider initial evacuation
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.