☣️ UN 2427 • CLASS 5
Potassium 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 2427
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
Isolation: ERG 140: isolate 50m all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
Chemical & Response Details
| Also known as | Potassium chlorate solutionChlorate of potash solutionPotassium chlorate in waterAqueous KClO3 |
| CAS Number | 3811-04-9 |
| Appearance | Clear to slightly turbid colorless aqueous solution. Odorless. Density greater than water. |
| Flash Point | Not applicable (non-flammable oxidizer in aqueous solution) |
| Boiling Point | Approximately 100C (212F), varies with concentration |
| Vapor Density | Not applicable (aqueous solution) |
| Water Reactivity | Already in aqueous solution; dilution with water reduces oxidizing strength |
| Extinguishing | Water fog, dry chemical; avoid combustible materials and organics near oxidizer |
| PPE | ⚠️ Level B minimum; SCBA, chemical-resistant suit; avoid contact with skin and eyes |
| Isolation | ERG 140: isolate 50m all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation |
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 2427 — Potassium chlorate, aqueous solution HAZMAT RADIO NOTE — UN 2427
Product: Potassium chlorate, aqueous solution
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum; SCBA, chemical-resistant suit; avoid contact with skin and eyes
ISOLATION: ERG 140: isolate 50m all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
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 2427 — Potassium chlorate, aqueous solution
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Clear to slightly turbid colorless aqueous solution. Odorless. Density greater than water.
Water Reactivity: Already in aqueous solution; dilution with water reduces oxidizing strength
Extinguishing: Water fog, dry chemical; avoid combustible materials and organics near oxidizer
PPE: Level B minimum; SCBA, chemical-resistant suit; avoid contact with skin and eyes
Isolation: ERG 140: isolate 50m all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
— 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/2427 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2427 Potassium chlorate, aqueous solution Cls5 ERG140 | allfirefighter.com/hazmat/un/2427SMS / 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/2427
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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; SCBA, chemical-resistant suit; avoid contact with skin and eyes
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.