☣️ UN 2428 • CLASS 5
Sodium chlorate, aqueous solution
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 2428
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
Isolation: ERG 140: isolate spill 25-50m; if tank/rail car involved in fire isolate 800m all directions and consider evacuation 1600m downwind
Chemical & Response Details
| Also known as | Sodium chlorate solutionChlorate of soda solutionNatriumchlorat solutionChloric acid sodium salt solution |
| CAS Number | 7775-09-9 |
| Appearance | Clear to pale yellow aqueous solution, odorless or slight chlorine-like odor. Highly concentrated solutions may crystallize at room temperature. |
| Flash Point | Not applicable (non-flammable oxidizing solution) |
| Boiling Point | 100-110C (212-230F) depending on concentration |
| Vapor Density | Not applicable (aqueous solution) |
| Water Reactivity | Already in aqueous form; miscible with water but increases oxidizing hazard when concentrated |
| Extinguishing | Water spray or fog only; do not use foam or dry chemical on oxidizers |
| PPE | ⚠️ Level B minimum with full face respirator; chemical-resistant suit and gloves; SCBA if fire or decomposition fumes present |
| Isolation | ERG 140: isolate spill 25-50m; if tank/rail car involved in fire isolate 800m all directions and consider evacuation 1600m downwind |
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 2428 — Sodium chlorate, aqueous solution HAZMAT RADIO NOTE — UN 2428
Product: Sodium chlorate, aqueous solution
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum with full face respirator; chemical-resistant suit and gloves; SCBA if fire or decomposition fumes present
ISOLATION: ERG 140: isolate spill 25-50m; if tank/rail car involved in fire isolate 800m all directions and consider evacuation 1600m 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 2428 — Sodium chlorate, aqueous solution
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Clear to pale yellow aqueous solution, odorless or slight chlorine-like odor. Highly concentrated solutions may crystallize at room temperature.
Water Reactivity: Already in aqueous form; miscible with water but increases oxidizing hazard when concentrated
Extinguishing: Water spray or fog only; do not use foam or dry chemical on oxidizers
PPE: Level B minimum with full face respirator; chemical-resistant suit and gloves; SCBA if fire or decomposition fumes present
Isolation: ERG 140: isolate spill 25-50m; if tank/rail car involved in fire isolate 800m all directions and consider evacuation 1600m 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 —
• 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/2428 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2428 Sodium chlorate, aqueous solution Cls5 ERG140 | allfirefighter.com/hazmat/un/2428SMS / 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/2428
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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 with full face respirator; chemical-resistant suit and gloves; SCBA if fire or decomposition fumes present
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.