☣️ UN 2846 • CLASS 4
Pyrophoric solid, organic, n.o.s.
Placard: Spontaneously Combustible. 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 2846
Class: 4
Placard type: Spontaneously Combustible
ERG: Guide 135 (check current ERG)
Isolation: ERG 135: isolate spill area immediately for at least 25-50m in all directions; if fire or large spill, isolate 800m in all directions and consider evacuation for 800m downwind
Chemical & Response Details
| Also known as | Pyrophoric organic solidSelf-igniting organic solidSpontaneously combustible organic solidAir-reactive organic solid |
| Appearance | Typically a fine powder or granular solid that may vary in color from tan to dark brown or black. Often has little to no odor in its packaged state. Ignites spontaneously upon exposure to air at or below 54°C (130°F). |
| Flash Point | Not applicable (ignites spontaneously in air) |
| Boiling Point | Not applicable (decomposes upon ignition) |
| Vapor Density | Not applicable (solid material) |
| Water Reactivity | May react with water or moisture to generate flammable gases or increase ignitability; keep dry |
| Extinguishing | Dry sand, dry chemical, soda ash, lime; DO NOT use water, foam, or CO2 |
| PPE | ⚠️ Level B minimum with SCBA; full protective clothing and face shield required; avoid any static discharge or friction |
| Isolation | ERG 135: isolate spill area immediately for at least 25-50m in all directions; if fire or large spill, isolate 800m in all directions and consider evacuation for 800m downwind |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Flammable/combustible material.
- May ignite on contact with moist air or moisture.
- May burn rapidly with flare-burning effect.
- Some react vigorously or explosively on contact with water.
- Some may decompose explosively when heated or involved in a fire.
- May re-ignite after fire is extinguished.
- Runoff may create fire or explosion hazard.
- Containers may explode when heated.
First actions (field-minded)
- 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 2846 — Pyrophoric solid, organic, n.o.s. HAZMAT RADIO NOTE — UN 2846
Product: Pyrophoric solid, organic, n.o.s.
Class 4 / Spontaneously Combustible / ERG 135
PPE: Level B minimum with SCBA; full protective clothing and face shield required; avoid any static discharge or friction
ISOLATION: ERG 135: isolate spill area immediately for at least 25-50m in all directions; if fire or large spill, isolate 800m in all directions and consider evacuation for 800m downwind
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 2846 — Pyrophoric solid, organic, n.o.s.
Class: 4 | Placard: Spontaneously Combustible | ERG Guide: 135
Appearance: Typically a fine powder or granular solid that may vary in color from tan to dark brown or black. Often has little to no odor in its packaged state. Ignites spontaneously upon exposure to air at or below 54°C (130°F).
Water Reactivity: May react with water or moisture to generate flammable gases or increase ignitability; keep dry
Extinguishing: Dry sand, dry chemical, soda ash, lime; DO NOT use water, foam, or CO2
PPE: Level B minimum with SCBA; full protective clothing and face shield required; avoid any static discharge or friction
Isolation: ERG 135: isolate spill area immediately for at least 25-50m in all directions; if fire or large spill, isolate 800m in all directions and consider evacuation for 800m downwind
— Key Hazards —
• Flammable/combustible material.
• May ignite on contact with moist air or moisture.
• May burn rapidly with flare-burning effect.
— 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/2846 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2846 Pyrophoric solid, organic, n.o.s. Cls4 ERG135 | allfirefighter.com/hazmat/un/2846SMS / 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/2846
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FAQ
Flammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.
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 with SCBA; full protective clothing and face shield required; avoid any static discharge or friction
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 135 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.