☣️ UN 3100 • CLASS 5
UN 3100 — Oxidizing solid, self-heating, n.o.s.
Placard: Oxidizer. ERG Guide 135. 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 3100 Quick Details
UN 3100
Product name: Oxidizing solid, self-heating, n.o.s.
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 135 (check current ERG)
Initial isolation: ERG 135: isolate spill 25m all directions; if fire, isolate 800m all directions and consider evacuation
Common Hazards of UN 3100
- 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.
Chemical Identity & Physical Properties
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3100
Extinguishing Media
Dry sand, dry chemical, soda ash; avoid water-based agents unless material is identified
PPE Requirements
⚠️ Level B minimum; SCBA required; chemical-resistant suit for dust exposure; avoid ignition sources
Isolation & Evacuation
ERG 135: isolate spill 25m all directions; if fire, isolate 800m all directions and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 135).
First Actions for a UN 3100 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.
- 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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📋 Copy & Share Field Card
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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Frequently Asked Questions about UN 3100
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
Water reactivity: May ignite on contact with moisture; avoid water contact unless specified for the particular substance. Recommended extinguishing: Dry sand, dry chemical, soda ash; avoid water-based agents unless material is identified.
ERG Guide 135 recommendation: ERG 135: isolate spill 25m all directions; if fire, isolate 800m all directions and consider evacuation
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.