☣️ UN 1452 • CLASS 5
UN 1452 — Calcium chlorate
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 chlorate is a white to yellowish crystalline solid or powder with no odor. It is a hygroscopic substance that absorbs moisture from the air.
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: Isolate the spill area with a minimum 100m radius. Protect persons downwind; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m in all directions.
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UN 1452 Quick Details
UN 1452
Product name: Calcium chlorate
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: Initial isolation 100m in all directions; protect persons downwind; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m in all directions
Common Hazards of UN 1452
- 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
White to yellowish crystalline solid or powder. Odorless. Hygroscopic (absorbs moisture from air).
| Also known as | Chloric acid calcium saltCalcium chlorate anhydrousCalciumchlorateChlorate de calcium |
| CAS Number | 10137-74-3 |
| Appearance | White to yellowish crystalline solid or powder. Odorless. Hygroscopic (absorbs moisture from air). |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Not applicable (decomposes at approximately 340C/644F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; solution may become warm but no violent reaction under normal conditions |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1452
Extinguishing Media
Do not use water spray or foam on burning material; use dry sand, dry chemical, or smother with inert material
PPE Requirements
⚠️ Level B minimum recommended; self-contained breathing apparatus (SCBA) and chemical-resistant protective clothing required for fire or spill response
Level B minimum recommended; self-contained breathing apparatus (SCBA) and chemical-resistant protective clothing required for fire or spill response
Isolation & Evacuation
ERG 140: Initial isolation 100m in all directions; protect persons downwind; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m in all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 1452 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 1452 — Calcium chlorateHAZMAT RADIO NOTE — UN 1452
Product: Calcium chlorate
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum recommended; self-contained breathing apparatus (SCBA) and chemical-resistant protective clothing required for fire or spill response
ISOLATION: ERG 140: Initial isolation 100m in all directions; protect persons downwind; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m 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 1452 — Calcium chlorate
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White to yellowish crystalline solid or powder. Odorless. Hygroscopic (absorbs moisture from air).
Water Reactivity: Soluble in water; solution may become warm but no violent reaction under normal conditions
Extinguishing: Do not use water spray or foam on burning material; use dry sand, dry chemical, or smother with inert material
PPE: Level B minimum recommended; self-contained breathing apparatus (SCBA) and chemical-resistant protective clothing required for fire or spill response
Isolation: ERG 140: Initial isolation 100m in all directions; protect persons downwind; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m 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 —
• 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-chlorate-un-1452 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1452 Calcium chlorate Cls5 ERG140 | allfirefighter.com/hazmat/un/calcium-chlorate-un-1452SMS / 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-chlorate-un-1452
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Frequently Asked Questions about UN 1452
No, but it will accelerate burning when involved in a fire.
Do not use water spray or foam on burning material.
Soluble in water; solution may become warm but no violent reaction under normal conditions
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.