☣️ UN 3100 • CLASS 5
Oxidizing solid, self-heating, n.o.s.
Placard: Oxidizer. 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 3100
Class: 5
Placard type: Oxidizer
ERG: Guide 135 (check current ERG)
Isolation: ERG 135: isolate spill 25m all directions; if fire, isolate 800m all directions and consider evacuation
Chemical & Response Details
| Also known as | Oxidizing solid self-heating NOSSelf-heating oxidizerClass 5.1 self-heating solid |
| Appearance | Variable appearance depending on specific substance; typically a solid material that may be in powder, granular, or crystalline form. Color and odor vary by composition. Capable of spontaneous heating when exposed to air or moisture. |
| Flash Point | Not applicable (oxidizing solid, self-heating material) |
| Boiling Point | Not applicable (decomposes or ignites before boiling) |
| Vapor Density | Not applicable (solid material) |
| Water Reactivity | May ignite on contact with moisture; avoid water contact unless specified for the particular substance |
| Extinguishing | Dry sand, dry chemical, soda ash; avoid water-based agents unless material is identified |
| PPE | ⚠️ Level B minimum; SCBA required; chemical-resistant suit for dust exposure; avoid ignition sources |
| Isolation | ERG 135: isolate spill 25m all directions; if fire, isolate 800m all directions and consider evacuation |
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 3100 — Oxidizing solid, self-heating, n.o.s. HAZMAT RADIO NOTE — UN 3100
Product: Oxidizing solid, self-heating, n.o.s.
Class 5 / Oxidizer / ERG 135
PPE: Level B minimum; SCBA required; chemical-resistant suit for dust exposure; avoid ignition sources
ISOLATION: ERG 135: isolate spill 25m all directions; if fire, isolate 800m all directions and consider 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 3100 — Oxidizing solid, self-heating, n.o.s.
Class: 5 | Placard: Oxidizer | ERG Guide: 135
Appearance: Variable appearance depending on specific substance; typically a solid material that may be in powder, granular, or crystalline form. Color and odor vary by composition. Capable of spontaneous heating when exposed to air or moisture.
Water Reactivity: May ignite on contact with moisture; avoid water contact unless specified for the particular substance
Extinguishing: Dry sand, dry chemical, soda ash; avoid water-based agents unless material is identified
PPE: Level B minimum; SCBA required; chemical-resistant suit for dust exposure; avoid ignition sources
Isolation: ERG 135: isolate spill 25m all directions; if fire, isolate 800m all directions and consider evacuation
— 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/3100 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3100 Oxidizing solid, self-heating, n.o.s. Cls5 ERG135 | allfirefighter.com/hazmat/un/3100SMS / 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/3100
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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; SCBA required; chemical-resistant suit for dust exposure; avoid ignition sources
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.