☣️ UN 1453 • CLASS 5
UN 1453 — Calcium chlorite
Placard: Oxidizer. ERG Guide 140. 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.
Calcium chlorite is a white to yellowish powder or granular solid with a slight chlorine-like odor at room temperature. It is highly reactive and can accelerate combustion of nearby materials.
Hazard overview: These substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire.
Response guidance: Use dry chemical, sand, or dry earth to extinguish fires. Do not use water or foam.
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UN 1453 Quick Details
UN 1453
Product name: Calcium chlorite
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate spill area 25-50m all directions; if fire or explosion risk, consider evacuation 800m downwind
Common Hazards of UN 1453
- 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 chlorite is a white to yellowish powder or granular solid with a slight chlorine-like odor at room temperature.
| Also known as | Calcium chloriteCalcium hypochlorite chloriteChlorous acid calcium salt |
| CAS Number | 14674-72-7 |
| Appearance | White to yellowish powder or granular solid with a slight chlorine-like odor at room temperature. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts with water releasing heat and oxygen; may accelerate combustion of nearby materials |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1453
Extinguishing Media
Dry chemical, sand, or dry earth only; do not use water or foam
PPE Requirements
⚠️ Level B minimum with SCBA; chemical-resistant gloves and boots; face shield recommended
Level B minimum with SCBA; chemical-resistant gloves and boots; face shield recommended.
Isolation & Evacuation
ERG 140: isolate spill area 25-50m all directions; if fire or explosion risk, consider evacuation 800m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 1453 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 1453 — Calcium chloriteHAZMAT RADIO NOTE — UN 1453
Product: Calcium chlorite
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum with SCBA; chemical-resistant gloves and boots; face shield recommended
ISOLATION: ERG 140: isolate spill area 25-50m all directions; if fire or explosion risk, consider evacuation 800m 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 1453 — Calcium chlorite
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White to yellowish powder or granular solid with a slight chlorine-like odor at room temperature.
Water Reactivity: Reacts with water releasing heat and oxygen; may accelerate combustion of nearby materials
Extinguishing: Dry chemical, sand, or dry earth only; do not use water or foam
PPE: Level B minimum with SCBA; chemical-resistant gloves and boots; face shield recommended
Isolation: ERG 140: isolate spill area 25-50m all directions; if fire or explosion risk, consider evacuation 800m 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/calcium-chlorite-un-1453 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1453 Calcium chlorite Cls5 ERG140 | allfirefighter.com/hazmat/un/calcium-chlorite-un-1453SMS / 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/calcium-chlorite-un-1453
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Frequently Asked Questions about UN 1453
No, but it will accelerate burning when involved in a fire.
It reacts with water releasing heat and oxygen; may accelerate combustion of nearby materials.
Use dry chemical, sand, or dry earth only; do not use water or foam.
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.