UN 1457 — Calcium peroxide
Placard: Oxidizer. ERG Guide 140. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
Calcium peroxide is a highly reactive substance used in various applications. It is essential to handle it with caution and follow proper emergency procedures.
Hazard overview: Calcium peroxide accelerates burning when involved in a fire and may decompose explosively when heated or involved in a fire. It is also a white to yellowish-white odorless powder or granular solid.
Response guidance: In case of a fire, use dry chemical, dry sand, or dry powder. Avoid using large amounts of water, as it may react slowly with the substance to release oxygen and form calcium hydroxide.
UN 1457 Quick Details
Common Hazards of UN 1457
- 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
Calcium peroxide is a white to yellowish-white odorless powder or granular solid at room temperature.
| Also known as | Calcium dioxideCalcium superoxideCaloxolCalverde |
| CAS Number | 1305-79-9 |
| Appearance | White to yellowish-white odorless powder or granular solid at room temperature. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Not applicable (decomposes above 275C/527F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts slowly with water to release oxygen and form calcium hydroxide; avoid large quantities of water |
Fireground Response Guidance — UN 1457
Extinguishing Media
PPE Requirements
Wear Level B minimum personal protective equipment, including a self-contained breathing apparatus (SCBA) and chemical-resistant gloves and a suit to prevent skin contact.
Isolation & Evacuation
First Actions for a UN 1457 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).
📋 Copy & Share Field Card
UN 1457 — Calcium peroxideUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.