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.
UN 3407 is Chlorate and magnesium chloride mixture, solution, an oxidizing chlorate mixture solution assigned to ERG Guide 140. Dried residues and combustible contamination are key risks.
Hazard overview: OXIDIZING chlorate mixture solution; can accelerate burning and react violently with combustibles. Magnesium chloride content may increase corrosivity and chloride contamination concerns. Contamination with fuels, organics, reducing agents, acids or metal powders can cause fire or violent decomposition.
Response guidance: For UN 3407, isolate the release, remove combustibles/reducing agents and use SCBA for mist or fire. Control oxidizing/toxic runoff and verify SDS under ERG 140.
Firefighter training notes: Training for UN 3407 should emphasize oxidizer contamination, incompatible materials, toxic metal/runoff hazards, SCBA use and oxidizer-compatible cleanup. Use ERG 140, SDS and local SOP.
Regulatory context: Chlorate and magnesium chloride mixture, solution is regulated as a hazardous material for transport and emergency response. Storage, reporting, exposure, waste and incident-notification duties depend on quantity, concentration, formulation and jurisdiction; verify shipping papers, SDS and authority guidance.
Storage & handling: Chlorate and magnesium chloride mixture, solution should be stored in compatible oxidizer-rated containers away from combustibles, organics, fuels, reducing agents, acids where incompatible and contamination sources.
UN 3407 Quick Details
Common Hazards of UN 3407
- OXIDIZING chlorate mixture solution; can accelerate burning and react violently with combustibles.
- Magnesium chloride content may increase corrosivity and chloride contamination concerns.
- Contamination with fuels, organics, reducing agents, acids or metal powders can cause fire or violent decomposition.
- Although aqueous, dried residues may remain strong oxidizers.
- Fire may produce chlorine-containing gases and irritating/corrosive smoke.
- Runoff may be oxidizing, corrosive and harmful to waterways.
- Exact concentration and mixture composition must be verified from SDS.
Chemical Identity & Physical Properties
Clear to pale yellow liquid solution. Odorless or slight chlorine-like odor. Aqueous solution at room temperature.
| 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 |
Fireground Response Guidance — UN 3407
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for fire, mist or confined-space exposure. Wear chemical-resistant gloves, boots, eye/face protection and oxidizer-compatible protective clothing.
Isolation & Evacuation
First Actions for a UN 3407 Incident
- Call 911 and the emergency response number on the shipping paper, if available.
- Keep unauthorized personnel away and establish incident command.
- Stay upwind, uphill and upstream.
- Avoid breathing vapor, dust, mist, smoke or fumes and avoid skin or eye contact.
- Keep combustibles, organics, fuels, oils and reducing agents away from the oxidizer.
- Do not touch damaged containers or spilled material without proper training and PPE.
- Prevent contaminated liquid, dust, runoff and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 140, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 3407 — Chlorate and magnesium chloride mixture,Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.