☣️ UN 3544 • CLASS 5
UN 3544 — Articles containing oxidizing substance, 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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⚠️ Verification required:
Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ 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.
UN 3544 is Articles containing oxidizing substance, n.o.s., assigned to ERG Guide 140. This entry should be verified with shipping papers, labels and the SDS before responders commit to close-range action.
Hazard overview: Articles containing oxidizing substance, n.o.s. can intensify fire and may react dangerously with heat, contamination, fuels or damaged packaging. Containers or articles may rupture when heated.
Response guidance: Use ERG Guide 140, confirm the exact contents, isolate the area, keep unauthorized personnel away, control ignition sources and choose extinguishing agents based on the article or material involved.
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UN 3544 Quick Details
UN 3544
Product name: Articles containing oxidizing substance, n.o.s.
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial 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
Common Hazards of UN 3544
- 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
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.
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3544
Extinguishing Media
Dry chemical, CO2, sand; water spray may be used to cool intact articles from distance
PPE Requirements
⚠️ Level B minimum; SCBA required; protective clothing for oxidizer exposure; avoid contact with damaged or leaking articles
Level B minimum; SCBA required; protective clothing for oxidizer exposure; avoid contact with damaged or leaking articles. Select final PPE using ERG guidance, SDS, monitoring and incident command.
Isolation & Evacuation
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
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 3544 Incident
- 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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📋 Copy & Share Field Card
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 —
• 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
SOURCE: allfirefighter.com/hazmat/un/articles-containing-oxidizing-substance-un-3544 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3544 Articles containing oxidizing substance, n.o.s. Cls5 ERG140 | allfirefighter.com/hazmat/un/articles-containing-oxidizing-substance-un-3544SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/articles-containing-oxidizing-substance-un-3544
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Frequently Asked Questions about UN 3544
UN 3544 is Articles containing oxidizing substance, n.o.s., assigned to ERG Guide 140.
ERG Guide 140 applies for initial isolation, protective actions and first response guidance.
Articles containing oxidizing substance, n.
Level B minimum; SCBA required; protective clothing for oxidizer exposure; avoid contact with damaged or leaking articles.
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.