☣️ UN 3137 • CLASS 5
UN 3137 — Oxidizing solid, flammable, n.o.s.
Placard: Oxidizer. ERG Guide 140. 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 3137 Quick Details
UN 3137
Product name: Oxidizing solid, flammable, n.o.s.
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate 50m (150 ft) all directions initially; if tank/rail car involved in fire, isolate 800m (0.5 mile) radius and consider evacuation
Common Hazards of UN 3137
- These substances will accelerate burning when involved in a fire.
- Some may decompose explosively when heated or involved in a fire.
- May explode from heat or contamination.
- Some will react explosively with hydrocarbons (fuels).
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
- Inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, burns or
Chemical Identity & Physical Properties
| Also known as | Oxidizing solid, flammable, not otherwise specifiedClass 5.1 flammable oxidizerOxidizer/combustible mixture |
| Appearance | Variable appearance depending on specific composition; typically a solid material that combines oxidizing and flammable properties, may be powder, granular, or crystalline form. |
| Flash Point | Variable - depends on specific flammable component, typically low |
| Boiling Point | Not applicable (solid, may decompose before melting) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Variable - exercise caution, may react with water depending on composition |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3137
Extinguishing Media
Dry chemical, sand, or dry earth only; avoid water-based agents unless approved for specific material
PPE Requirements
⚠️ Level B minimum with SCBA; full protective clothing; avoid all ignition sources; approach with extreme caution
Isolation & Evacuation
ERG 140: isolate 50m (150 ft) all directions initially; if tank/rail car involved in fire, isolate 800m (0.5 mile) radius and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 3137 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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UN 3137 — Oxidizing solid, flammable, n.o.s.HAZMAT RADIO NOTE — UN 3137
Product: Oxidizing solid, flammable, n.o.s.
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum with SCBA; full protective clothing; avoid all ignition sources; approach with extreme caution
ISOLATION: ERG 140: isolate 50m (150 ft) all directions initially; if tank/rail car involved in fire, isolate 800m (0.5 mile) radius 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 3137 — Oxidizing solid, flammable, n.o.s.
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Variable appearance depending on specific composition; typically a solid material that combines oxidizing and flammable properties, may be powder, granular, or crystalline form.
Water Reactivity: Variable - exercise caution, may react with water depending on composition
Extinguishing: Dry chemical, sand, or dry earth only; avoid water-based agents unless approved for specific material
PPE: Level B minimum with SCBA; full protective clothing; avoid all ignition sources; approach with extreme caution
Isolation: ERG 140: isolate 50m (150 ft) all directions initially; if tank/rail car involved in fire, isolate 800m (0.5 mile) radius and consider evacuation
— Key Hazards —
• These substances will accelerate burning when involved in a fire.
• Some may decompose explosively when heated or involved in a fire.
• May explode from heat or contamination.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/3137 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3137 Oxidizing solid, flammable, n.o.s. Cls5 ERG140 | allfirefighter.com/hazmat/un/3137SMS / 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/3137
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Frequently Asked Questions about UN 3137
These substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire. May explode from heat or contamination. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard. Inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, burns or
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum with SCBA; full protective clothing; avoid all ignition sources; approach with extreme caution
Water reactivity: Variable - exercise caution, may react with water depending on composition. Recommended extinguishing: Dry chemical, sand, or dry earth only; avoid water-based agents unless approved for specific material.
ERG Guide 140 recommendation: ERG 140: isolate 50m (150 ft) all directions initially; if tank/rail car involved in fire, isolate 800m (0.5 mile) radius and consider evacuation
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 140 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.