☣️ UN 2723 • CLASS 5
UN 2723 — Magnesium chlorate
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.
UN 2723 At a Glance
UN 2723 (Magnesium chlorate) is listed as DOT Class 5 Oxidizer and is assigned to ERG Guide 140. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.
Magnesium chlorate is an oxidizing chlorate; heat, friction or contamination with organics can create a severe fire or explosion hazard.
Hazard overview: Magnesium chlorate should be treated as an oxidizing solid. It can make ordinary combustibles burn faster and may decompose violently if heated or contaminated.
Response guidance: Isolate the area, eliminate ignition sources and keep combustibles away. Use dry chemical or dry sand for small material fires when appropriate; cool exposed containers from a protected distance with water spray if it can be done safely.
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UN 2723 Quick Details
UN 2723
Product name: Magnesium chlorate
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate 25-50m initially; if fire, isolate 800m all directions and consider evacuation for 800m downwind
Common Hazards of UN 2723
- Magnesium chlorate is an oxidizer; it can intensify burning even though the material itself is not a fuel.
- Heat, shock, friction or contamination may cause rapid decomposition or explosion.
- Keep away from fuels, oils, paper, wood, clothing and other organic or reducing materials.
- Containers may rupture or explode when heated in a fire.
- Dust, solution or decomposition fumes may irritate or injure the eyes, skin and respiratory tract.
- Fire may produce toxic or irritating metal oxide and nitrogen/chlorine oxide fumes.
- Runoff can spread oxidizer contamination and increase fire or environmental hazards.
Chemical Identity & Physical Properties
White to yellowish crystalline solid, odorless. Hygroscopic, usually exists as hexahydrate form
| Also known as | Magnesium chlorate hexahydrateChloric acid magnesium saltMagnesium dichlorate |
| CAS Number | 10326-21-3 |
| Appearance | White to yellowish crystalline solid, odorless. Hygroscopic, usually exists as hexahydrate form. |
| Flash Point | Not applicable (oxidizer) |
| Boiling Point | Decomposes at 120C (248F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water, no violent reaction but releases heat |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2723
Extinguishing Media
Do not use foam or water; use dry sand, dry chemical, or soda ash to smother
PPE Requirements
⚠️ Level B minimum; full face respirator, chemical-resistant suit; avoid all ignition sources
Use SCBA for fire, dust or fume conditions with chemical-resistant clothing, gloves and eye protection; upgrade based on monitoring and SDS.
Isolation & Evacuation
ERG 140: isolate 25-50m initially; if fire, isolate 800m all directions and consider evacuation for 800m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 2723 Incident
- Call 911 and the emergency response number shown on the shipping papers.
- Keep unauthorized personnel away and deny entry to the spill or fire area.
- Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
- Avoid breathing dust, vapor, mist or smoke; prevent skin and eye contact.
- Do not touch damaged containers or spilled material without appropriate PPE.
- Ventilate confined spaces only if personnel are trained, equipped and monitored.
- Use the ERG, SDS, shipping papers and air monitoring to set isolation, PPE and tactical decisions.
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📋 Copy & Share Field Card
UN 2723 — Magnesium chlorateHAZMAT RADIO NOTE — UN 2723
Product: Magnesium chlorate
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum; full face respirator, chemical-resistant suit; avoid all ignition sources
ISOLATION: ERG 140: isolate 25-50m initially; if fire, isolate 800m all directions and consider evacuation for 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 2723 — Magnesium chlorate
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White to yellowish crystalline solid, odorless. Hygroscopic, usually exists as hexahydrate form.
Water Reactivity: Soluble in water, no violent reaction but releases heat
Extinguishing: Do not use foam or water; use dry sand, dry chemical, or soda ash to smother
PPE: Level B minimum; full face respirator, chemical-resistant suit; avoid all ignition sources
Isolation: ERG 140: isolate 25-50m initially; if fire, isolate 800m all directions and consider evacuation for 800m downwind
— Key Hazards —
• Magnesium chlorate is an oxidizer; it can intensify burning even though the material itself is not a fuel.
• Heat, shock, friction or contamination may cause rapid decomposition or explosion.
• Keep away from fuels, oils, paper, wood, clothing and other organic or reducing materials.
— First Actions —
• Call 911 and the emergency response number shown on the shipping papers.
• Keep unauthorized personnel away and deny entry to the spill or fire area.
• Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
• Avoid breathing dust, vapor, mist or smoke; prevent skin and eye contact.
SOURCE: allfirefighter.com/hazmat/un/magnesium-chlorate-un-2723 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN2723 Magnesium chlorate Cls5 ERG140 | allfirefighter.com/hazmat/un/magnesium-chlorate-un-2723SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/magnesium-chlorate-un-2723
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Frequently Asked Questions about UN 2723
UN 2723 is Magnesium chlorate, regulated as an oxidizing hazardous material for transport and emergency response.
The main concern is an oxidizing hazardous material behavior plus exposure risk from dust, vapor, liquid or fire products.
Approach from upwind, isolate the area, keep nonessential people out and verify the exact product with shipping papers or SDS.
Water may dissolve the material and spread contamination. Use water spray mainly for cooling exposed containers unless the SDS or incident commander directs otherwise.
Use SCBA for fire, dust or fume conditions with chemical-resistant clothing, gloves and eye protection; upgrade based on monitoring and SDS.
Fire can accelerate rapidly and may involve container rupture or toxic oxidizer decomposition fumes.
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.