☣️ UN 1459 • CLASS 5
UN 1459 — Chlorate and magnesium chloride mixture, solid
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 1459 Quick Details
UN 1459
Product name: Chlorate and magnesium chloride mixture, solid
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate 50m all directions; if tank/railcar involved in fire, isolate 800m all directions and consider evacuation
Common Hazards of UN 1459
- 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 | Chlorate-magnesium chloride mixtureMagnesium chloride-chlorate blendSolid chlorate/MgCl2 mixture |
| Appearance | White to off-white crystalline solid or powder mixture. Odorless or slight chlorine-like odor at room temperature. |
| Flash Point | Not applicable (oxidizer solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Dissolves in water; liberates heat. May accelerate combustion of organic materials when wet. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1459
Extinguishing Media
Water spray for cooling only, dry chemical, sand. Do not use organic materials or combustibles.
PPE Requirements
⚠️ Level B minimum; SCBA required in fire or decomposition scenarios; chemical-resistant suit for spill response.
Isolation & Evacuation
ERG 140: isolate 50m all directions; if tank/railcar involved in fire, isolate 800m all directions and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 1459 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 1459 — Chlorate and magnesium chloride mixture,HAZMAT RADIO NOTE — UN 1459
Product: Chlorate and magnesium chloride mixture, solid
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum; SCBA required in fire or decomposition scenarios; chemical-resistant suit for spill response.
ISOLATION: ERG 140: isolate 50m all directions; if tank/railcar involved in fire, isolate 800m all directions 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 1459 — Chlorate and magnesium chloride mixture, solid
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White to off-white crystalline solid or powder mixture. Odorless or slight chlorine-like odor at room temperature.
Water Reactivity: Dissolves in water; liberates heat. May accelerate combustion of organic materials when wet.
Extinguishing: Water spray for cooling only, dry chemical, sand. Do not use organic materials or combustibles.
PPE: Level B minimum; SCBA required in fire or decomposition scenarios; chemical-resistant suit for spill response.
Isolation: ERG 140: isolate 50m all directions; if tank/railcar involved in fire, isolate 800m all directions 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/1459 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1459 Chlorate and magnesium chloride mixture, solid Cls5 ERG140 | allfirefighter.com/hazmat/un/1459SMS / 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/1459
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Frequently Asked Questions about UN 1459
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 required in fire or decomposition scenarios; chemical-resistant suit for spill response.
Water reactivity: Dissolves in water; liberates heat. May accelerate combustion of organic materials when wet.. Recommended extinguishing: Water spray for cooling only, dry chemical, sand. Do not use organic materials or combustibles..
ERG Guide 140 recommendation: ERG 140: isolate 50m all directions; if tank/railcar involved in fire, isolate 800m all directions 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.