☣️ UN 3545 • CLASS 5
Articles containing organic peroxide, n.o.s.
Placard: Organic Peroxide. 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 3545
Class: 5
Placard type: Organic Peroxide
ERG: Guide 145 (check current ERG)
Isolation: ERG 145: isolate spill/leak area immediate 25m in all directions; if fire or large spill, isolate 800m in all directions; evacuate 800m in all directions if tank/railcar involved in fire
Chemical & Response Details
| Also known as | Organic peroxide-containing articlesArticles with organic peroxidePeroxide-impregnated articlesN.O.S. organic peroxide articles |
| Appearance | Solid articles or devices containing organic peroxide formulations. Physical form varies widely depending on the article; may be white, colored, or transparent solids or semi-solids embedded in various materials. |
| Flash Point | Not applicable (article-based material, flash point depends on peroxide type) |
| Boiling Point | Not applicable (solid article) |
| Vapor Density | Not applicable (solid article) |
| Water Reactivity | Generally no significant reaction with water, but avoid water on heated or burning material |
| Extinguishing | Dry chemical, sand, CO2; avoid water spray on heated material; cool containers with water from distance |
| PPE | ⚠️ Level B minimum recommended; SCBA required in fire or decomposition scenarios; heat-resistant protective clothing if approaching heated articles |
| Isolation | ERG 145: isolate spill/leak area immediate 25m in all directions; if fire or large spill, isolate 800m in all directions; evacuate 800m in all directions if tank/railcar involved in fire |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- May explode from heat or contamination.
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- May be ignited by heat, sparks or flames.
- May burn rapidly with flare-burning effect.
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
- Fire may produce irritating, corrosive and/or toxic gases.
- Ingestion or contact (skin, eyes) with substance may cause severe injury or burns.
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.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- Consider initial evacuation for at least 250 meters (800 feet) in all directions.
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UN 3545 — Articles containing organic peroxide, n. HAZMAT RADIO NOTE — UN 3545
Product: Articles containing organic peroxide, n.o.s.
Class 5 / Organic Peroxide / ERG 145
PPE: Level B minimum recommended; SCBA required in fire or decomposition scenarios; heat-resistant protective clothing if approaching heated articles
ISOLATION: ERG 145: isolate spill/leak area immediate 25m in all directions; if fire or large spill, isolate 800m in all directions; evacuate 800m in all directions if tank/railcar involved in fire
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 3545 — Articles containing organic peroxide, n.o.s.
Class: 5 | Placard: Organic Peroxide | ERG Guide: 145
Appearance: Solid articles or devices containing organic peroxide formulations. Physical form varies widely depending on the article; may be white, colored, or transparent solids or semi-solids embedded in various materials.
Water Reactivity: Generally no significant reaction with water, but avoid water on heated or burning material
Extinguishing: Dry chemical, sand, CO2; avoid water spray on heated material; cool containers with water from distance
PPE: Level B minimum recommended; SCBA required in fire or decomposition scenarios; heat-resistant protective clothing if approaching heated articles
Isolation: ERG 145: isolate spill/leak area immediate 25m in all directions; if fire or large spill, isolate 800m in all directions; evacuate 800m in all directions if tank/railcar involved in fire
— Key Hazards —
• May explode from heat or contamination.
• May ignite combustibles (wood, paper, oil, clothing, etc.).
• May be ignited by heat, sparks or flames.
— 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.
• 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/3545 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3545 Articles containing organic peroxide, n.o.s. Cls5 ERG145 | allfirefighter.com/hazmat/un/3545SMS / 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/3545
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FAQ
May explode from heat or contamination. May ignite combustibles (wood, paper, oil, clothing, etc.). May be ignited by heat, sparks or flames. May burn rapidly with flare-burning effect. Containers may explode when heated. Runoff may create fire or explosion hazard. Fire may produce irritating, corrosive and/or toxic gases. Ingestion or contact (skin, eyes) with substance may cause severe injury or burns.
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 recommended; SCBA required in fire or decomposition scenarios; heat-resistant protective clothing if approaching heated articles
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 145 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.