☣️ UN 1475 • CLASS 5
Magnesium perchlorate
Placard: Oxidizer. 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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Quick details
UN 1475
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
Isolation: ERG 140: isolate spill/leak 50m all directions; if fire or explosion risk, isolate 800m and consider evacuation 1600m downwind
Chemical & Response Details
| Also known as | Magnesium perchlorate anhydrousPerchloric acid magnesium saltAnhydroneDehydrite |
| CAS Number | 10034-81-8 |
| Appearance | White to colorless crystalline solid or granules. Odorless. Highly hygroscopic, absorbs moisture readily from air. |
| Flash Point | Not applicable (oxidizer solid) |
| Boiling Point | Not applicable (decomposes above 250C/482F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Dissolves readily in water with heat generation; exothermic reaction but not violent |
| Extinguishing | Dry chemical, sand, or dry powder; avoid water in large quantities due to heat generation |
| PPE | ⚠️ Level B minimum; SCBA required in fire or heated conditions; chemical-resistant gloves and full protective clothing |
| Isolation | ERG 140: isolate spill/leak 50m all directions; if fire or explosion risk, isolate 800m and consider evacuation 1600m downwind |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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
First actions (field-minded)
- 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 1475 — Magnesium perchlorate HAZMAT RADIO NOTE — UN 1475
Product: Magnesium perchlorate
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum; SCBA required in fire or heated conditions; chemical-resistant gloves and full protective clothing
ISOLATION: ERG 140: isolate spill/leak 50m all directions; if fire or explosion risk, isolate 800m and consider evacuation 1600m 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 1475 — Magnesium perchlorate
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White to colorless crystalline solid or granules. Odorless. Highly hygroscopic, absorbs moisture readily from air.
Water Reactivity: Dissolves readily in water with heat generation; exothermic reaction but not violent
Extinguishing: Dry chemical, sand, or dry powder; avoid water in large quantities due to heat generation
PPE: Level B minimum; SCBA required in fire or heated conditions; chemical-resistant gloves and full protective clothing
Isolation: ERG 140: isolate spill/leak 50m all directions; if fire or explosion risk, isolate 800m and consider evacuation 1600m 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/1475 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1475 Magnesium perchlorate Cls5 ERG140 | ERG 140: isolate spill/leak 50m all directions; if fire or explosion risk, isola | allfirefighter.com/hazmat/un/1475SMS / 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/1475
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FAQ
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 heated conditions; chemical-resistant gloves and full protective clothing
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.