☣️ UN 2429 • CLASS 5
UN 2429 — Calcium chlorate, aqueous solution
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.
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UN 2429 Quick Details
UN 2429
Product name: Calcium chlorate, aqueous solution
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: Isolate spill 25-50m all directions. If fire or large spill, isolate 800m and evacuate 1600m downwind. Keep combustibles away.
Common Hazards of UN 2429
- 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
| Also known as | Calcium chlorate solutionChloric acid calcium salt solutionCalcium chlorate aqueous |
| CAS Number | 10137-74-3 |
| Appearance | Clear to pale yellow aqueous solution with no distinct odor. Liquid at room temperature, typically supplied in concentrations up to 50% by weight. |
| Flash Point | Not applicable (non-flammable oxidizer solution) |
| Boiling Point | Approximately 100C (212F), varies with concentration |
| Vapor Density | Not applicable (aqueous solution) |
| Water Reactivity | Already in aqueous solution; dissolves readily in water. Solution is stable but oxidizing. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2429
Extinguishing Media
Water spray, fog. Avoid organic materials and combustibles. Do not use foam or dry chemicals containing combustible components.
PPE Requirements
⚠️ Level B minimum with chemical-resistant suit. SCBA required in confined spaces or fire conditions. Nitrile or butyl rubber gloves, face shield.
Isolation & Evacuation
ERG 140: Isolate spill 25-50m all directions. If fire or large spill, isolate 800m and evacuate 1600m downwind. Keep combustibles away.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 2429 Incident
- 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 2429 — Calcium chlorate, aqueous solutionHAZMAT RADIO NOTE — UN 2429
Product: Calcium chlorate, aqueous solution
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum with chemical-resistant suit. SCBA required in confined spaces or fire conditions. Nitrile or butyl rubber gloves, face shield.
ISOLATION: ERG 140: Isolate spill 25-50m all directions. If fire or large spill, isolate 800m and evacuate 1600m downwind. Keep combustibles away.
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 2429 — Calcium chlorate, aqueous solution
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Clear to pale yellow aqueous solution with no distinct odor. Liquid at room temperature, typically supplied in concentrations up to 50% by weight.
Water Reactivity: Already in aqueous solution; dissolves readily in water. Solution is stable but oxidizing.
Extinguishing: Water spray, fog. Avoid organic materials and combustibles. Do not use foam or dry chemicals containing combustible components.
PPE: Level B minimum with chemical-resistant suit. SCBA required in confined spaces or fire conditions. Nitrile or butyl rubber gloves, face shield.
Isolation: ERG 140: Isolate spill 25-50m all directions. If fire or large spill, isolate 800m and evacuate 1600m downwind. Keep combustibles away.
— 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/2429 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2429 Calcium chlorate, aqueous solution Cls5 ERG140 | allfirefighter.com/hazmat/un/2429SMS / 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/2429
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Frequently Asked Questions about UN 2429
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 with chemical-resistant suit. SCBA required in confined spaces or fire conditions. Nitrile or butyl rubber gloves, face shield.
Water reactivity: Already in aqueous solution; dissolves readily in water. Solution is stable but oxidizing.. Recommended extinguishing: Water spray, fog. Avoid organic materials and combustibles. Do not use foam or dry chemicals containing combustible components..
ERG Guide 140 recommendation: ERG 140: Isolate spill 25-50m all directions. If fire or large spill, isolate 800m and evacuate 1600m downwind. Keep combustibles away.
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.