☣️ UN 1483 • CLASS 5
Peroxides, inorganic, 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 1483
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
Isolation: ERG 140: Initial isolation 100m in all directions. Protective action distance 800m downwind for large spills. If material is on fire or involved in fire, isolate 800m in all directions and consider evacuation for 1600m in all directions.
Chemical & Response Details
| Also known as | Inorganic peroxide compoundsMetal peroxidesAlkaline earth peroxidesOxidizing peroxides n.o.s. |
| Appearance | Various forms including white to colored powders or crystalline solids. Generally odorless. Physical appearance varies widely depending on specific peroxide compound. |
| Flash Point | Not applicable (oxidizer) |
| Boiling Point | Not applicable (typically decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Many react with water, releasing oxygen and heat. Some may react violently or generate flammable gases. Specific reactivity depends on the peroxide compound. |
| Extinguishing | Dry chemical, dry sand, or soda ash. DO NOT use water or foam on bulk quantities. |
| PPE | ⚠️ Level B minimum for spills; Level A if identity unknown or vapors present. Full face respirator with SCBA required. Chemical-resistant suit, gloves, and boots mandatory. |
| Isolation | ERG 140: Initial isolation 100m in all directions. Protective action distance 800m downwind for large spills. If material is on fire or involved in fire, isolate 800m in all directions and consider evacuation for 1600m in all directions. |
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 1483 — Peroxides, inorganic, n.o.s. HAZMAT RADIO NOTE — UN 1483
Product: Peroxides, inorganic, n.o.s.
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum for spills; Level A if identity unknown or vapors present. Full face respirator with SCBA required. Chemical-resistant suit, gloves, and boots mandatory.
ISOLATION: ERG 140: Initial isolation 100m in all directions. Protective action distance 800m downwind for large spills. If material is on fire or involved in fire, isolate 800m in all directions and consider evacuation for 1600m in 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 1483 — Peroxides, inorganic, n.o.s.
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Various forms including white to colored powders or crystalline solids. Generally odorless. Physical appearance varies widely depending on specific peroxide compound.
Water Reactivity: Many react with water, releasing oxygen and heat. Some may react violently or generate flammable gases. Specific reactivity depends on the peroxide compound.
Extinguishing: Dry chemical, dry sand, or soda ash. DO NOT use water or foam on bulk quantities.
PPE: Level B minimum for spills; Level A if identity unknown or vapors present. Full face respirator with SCBA required. Chemical-resistant suit, gloves, and boots mandatory.
Isolation: ERG 140: Initial isolation 100m in all directions. Protective action distance 800m downwind for large spills. If material is on fire or involved in fire, isolate 800m in all directions and consider evacuation for 1600m in 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/1483 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1483 Peroxides, inorganic, n.o.s. Cls5 ERG140 | allfirefighter.com/hazmat/un/1483SMS / 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/1483
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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 for spills; Level A if identity unknown or vapors present. Full face respirator with SCBA required. Chemical-resistant suit, gloves, and boots mandatory.
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.