☣️ UN 3139 • CLASS 5
UN 3139 — Oxidizing liquid, 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 3139 Quick Details
UN 3139
Product name: Oxidizing liquid, n.o.s.
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate spill area immediate precautions 50m all directions; if tank/rail car involved in fire isolate 800m all directions
Common Hazards of UN 3139
- 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 liquid NOSOxidizing liquid not otherwise specifiedClass 5.1 oxidizing liquidLiquid oxidizer NOS |
| Appearance | Variable appearance depending on specific oxidizer; typically clear to colored liquids with little or no odor at room temperature. Physical properties vary widely as this is a generic shipping classification. |
| Flash Point | Not applicable (oxidizer) |
| Boiling Point | Variable depending on specific oxidizer |
| Vapor Density | Variable depending on specific oxidizer |
| Water Reactivity | Variable; some may react vigorously with water or organic materials. Avoid contact with combustibles. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3139
Extinguishing Media
Dry chemical, CO2, or water spray from distance; avoid foam and organic materials
PPE Requirements
⚠️ Level B minimum; SCBA required; chemical-resistant suit for liquids; avoid all sources of ignition and combustible materials
Isolation & Evacuation
ERG 140: isolate spill area immediate precautions 50m all directions; if tank/rail car involved in fire isolate 800m all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 3139 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 3139 — Oxidizing liquid, n.o.s.HAZMAT RADIO NOTE — UN 3139
Product: Oxidizing liquid, n.o.s.
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum; SCBA required; chemical-resistant suit for liquids; avoid all sources of ignition and combustible materials
ISOLATION: ERG 140: isolate spill area immediate precautions 50m all directions; if tank/rail car involved in fire isolate 800m all directions
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 3139 — Oxidizing liquid, n.o.s.
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Variable appearance depending on specific oxidizer; typically clear to colored liquids with little or no odor at room temperature. Physical properties vary widely as this is a generic shipping classification.
Water Reactivity: Variable; some may react vigorously with water or organic materials. Avoid contact with combustibles.
Extinguishing: Dry chemical, CO2, or water spray from distance; avoid foam and organic materials
PPE: Level B minimum; SCBA required; chemical-resistant suit for liquids; avoid all sources of ignition and combustible materials
Isolation: ERG 140: isolate spill area immediate precautions 50m all directions; if tank/rail car involved in fire isolate 800m all directions
— 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/3139 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3139 Oxidizing liquid, n.o.s. Cls5 ERG140 | allfirefighter.com/hazmat/un/3139SMS / 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/3139
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Frequently Asked Questions about UN 3139
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; SCBA required; chemical-resistant suit for liquids; avoid all sources of ignition and combustible materials
Water reactivity: Variable; some may react vigorously with water or organic materials. Avoid contact with combustibles.. Recommended extinguishing: Dry chemical, CO2, or water spray from distance; avoid foam and organic materials.
ERG Guide 140 recommendation: ERG 140: isolate spill area immediate precautions 50m all directions; if tank/rail car involved in fire isolate 800m all directions
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.