☣️ UN 3407 • CLASS 5
UN 3407 — Chlorate and magnesium chloride mixture, 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 3407 Quick Details
UN 3407
Product name: Chlorate and magnesium chloride mixture, solution
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate 50m all directions initially. Large spill: isolate 100m. Fire: evacuate 800m downwind.
Common Hazards of UN 3407
- 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 solutionMagnesium chloride-chlorate mixtureMixed chlorate solution |
| Appearance | Clear to pale yellow liquid solution. Odorless or slight chlorine-like odor. Aqueous solution at room temperature. |
| Flash Point | Not applicable (non-flammable oxidizer solution) |
| Boiling Point | Approximately 100-110C (212-230F) depending on concentration |
| Vapor Density | Not applicable (aqueous solution) |
| Water Reactivity | Soluble in water; no violent reaction but increases oxidizing hazard in solution |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3407
Extinguishing Media
Water spray, fog. Avoid organic materials and combustibles. Do not use foam containing organic materials.
PPE Requirements
⚠️ Level B minimum; SCBA required in fire or confined space. Chemical-resistant suit, gloves, and boots. Face shield and eye protection mandatory.
Isolation & Evacuation
ERG 140: isolate 50m all directions initially. Large spill: isolate 100m. Fire: evacuate 800m downwind.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 3407 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 3407 — Chlorate and magnesium chloride mixture,HAZMAT RADIO NOTE — UN 3407
Product: Chlorate and magnesium chloride mixture, solution
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum; SCBA required in fire or confined space. Chemical-resistant suit, gloves, and boots. Face shield and eye protection mandatory.
ISOLATION: ERG 140: isolate 50m all directions initially. Large spill: isolate 100m. Fire: evacuate 800m 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 3407 — Chlorate and magnesium chloride mixture, solution
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Clear to pale yellow liquid solution. Odorless or slight chlorine-like odor. Aqueous solution at room temperature.
Water Reactivity: Soluble in water; no violent reaction but increases oxidizing hazard in solution
Extinguishing: Water spray, fog. Avoid organic materials and combustibles. Do not use foam containing organic materials.
PPE: Level B minimum; SCBA required in fire or confined space. Chemical-resistant suit, gloves, and boots. Face shield and eye protection mandatory.
Isolation: ERG 140: isolate 50m all directions initially. Large spill: isolate 100m. Fire: evacuate 800m 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/3407 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3407 Chlorate and magnesium chloride mixture, solution Cls5 ERG140 | allfirefighter.com/hazmat/un/3407SMS / 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/3407
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Frequently Asked Questions about UN 3407
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 confined space. Chemical-resistant suit, gloves, and boots. Face shield and eye protection mandatory.
Water reactivity: Soluble in water; no violent reaction but increases oxidizing hazard in solution. Recommended extinguishing: Water spray, fog. Avoid organic materials and combustibles. Do not use foam containing organic materials..
ERG Guide 140 recommendation: ERG 140: isolate 50m all directions initially. Large spill: isolate 100m. Fire: evacuate 800m downwind.
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.