☣️ UN 3544 • CLASS 5
Articles containing oxidizing substance, 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 3544
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
Isolation: ERG 140: isolate spill or leak area immediately for at least 25-50 meters in all directions; if fire or explosion involved, increase isolation distance to 800 meters and evacuate 1600 meters downwind
Chemical & Response Details
| Also known as | Oxidizing substance articles N.O.S.Articles with oxidizing agentsManufactured articles containing oxidizersOxidizer-containing devices |
| Appearance | Various manufactured articles, devices, or equipment containing oxidizing substances. Physical appearance varies depending on the specific article; may be solid components, cartridges, or assemblies containing chemical oxidizers. |
| Flash Point | Not applicable (articles/devices) |
| Boiling Point | Not applicable (articles/devices) |
| Vapor Density | Not applicable (articles/devices) |
| Water Reactivity | Variable depending on specific oxidizing substance contained; generally avoid water contact unless article integrity is compromised |
| Extinguishing | Dry chemical, CO2, sand; water spray may be used to cool intact articles from distance |
| PPE | ⚠️ Level B minimum; SCBA required; protective clothing for oxidizer exposure; avoid contact with damaged or leaking articles |
| Isolation | ERG 140: isolate spill or leak area immediately for at least 25-50 meters in all directions; if fire or explosion involved, increase isolation distance to 800 meters and evacuate 1600 meters downwind |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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
First actions (field-minded)
- 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 3544 — Articles containing oxidizing substance, HAZMAT RADIO NOTE — UN 3544
Product: Articles containing oxidizing substance, n.o.s.
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum; SCBA required; protective clothing for oxidizer exposure; avoid contact with damaged or leaking articles
ISOLATION: ERG 140: isolate spill or leak area immediately for at least 25-50 meters in all directions; if fire or explosion involved, increase isolation distance to 800 meters and evacuate 1600 meters 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 3544 — Articles containing oxidizing substance, n.o.s.
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Various manufactured articles, devices, or equipment containing oxidizing substances. Physical appearance varies depending on the specific article; may be solid components, cartridges, or assemblies containing chemical oxidizers.
Water Reactivity: Variable depending on specific oxidizing substance contained; generally avoid water contact unless article integrity is compromised
Extinguishing: Dry chemical, CO2, sand; water spray may be used to cool intact articles from distance
PPE: Level B minimum; SCBA required; protective clothing for oxidizer exposure; avoid contact with damaged or leaking articles
Isolation: ERG 140: isolate spill or leak area immediately for at least 25-50 meters in all directions; if fire or explosion involved, increase isolation distance to 800 meters and evacuate 1600 meters downwind
— 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/3544 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3544 Articles containing oxidizing substance, n.o.s. Cls5 ERG140 | allfirefighter.com/hazmat/un/3544SMS / 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/3544
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FAQ
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; protective clothing for oxidizer exposure; avoid contact with damaged or leaking articles
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.