☣️ UN 2427 • CLASS 5
UN 2427 — Potassium 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 2427 Quick Details
UN 2427
Product name: Potassium chlorate, aqueous solution
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate 50m all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
Common Hazards of UN 2427
- 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 | 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2427
Extinguishing Media
Water fog, dry chemical; avoid combustible materials and organics near oxidizer
PPE Requirements
⚠️ Level B minimum; SCBA, chemical-resistant suit; avoid contact with skin and eyes
Isolation & Evacuation
ERG 140: isolate 50m all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 2427 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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📋 Copy & Share Field Card
UN 2427 — Potassium chlorate, aqueous solutionHAZMAT 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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Frequently Asked Questions about UN 2427
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
Water reactivity: Already in aqueous solution; dilution with water reduces oxidizing strength. Recommended extinguishing: Water fog, dry chemical; avoid combustible materials and organics near oxidizer.
ERG Guide 140 recommendation: ERG 140: isolate 50m all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
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.