☣️ UN 1492 • CLASS 5
Potassium persulphate
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 1492
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
Isolation: ERG 140: Initial isolation 50m in all directions; protective action distance 100m downwind for large spills during day
Chemical & Response Details
| Also known as | Potassium peroxydisulfateDipotassium persulfatePotassium peroxydisulphateAnthion |
| CAS Number | 7727-21-1 |
| Appearance | White crystalline powder or granular solid, odorless. Stable at room temperature but decomposes when heated. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Decomposes at approximately 100C (212F) before boiling |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; aqueous solutions may slowly decompose releasing oxygen |
| Extinguishing | Water spray to keep containers cool; dry chemical or CO2 for small fires; avoid organic materials |
| PPE | ⚠️ Level C minimum with full face respirator; Level B with SCBA if fire involvement or confined space |
| Isolation | ERG 140: Initial isolation 50m in all directions; protective action distance 100m downwind for large spills during day |
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 1492 — Potassium persulphate HAZMAT RADIO NOTE — UN 1492
Product: Potassium persulphate
Class 5 / Oxidizer / ERG 140
PPE: Level C minimum with full face respirator; Level B with SCBA if fire involvement or confined space
ISOLATION: ERG 140: Initial isolation 50m in all directions; protective action distance 100m downwind for large spills during day
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 1492 — Potassium persulphate
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White crystalline powder or granular solid, odorless. Stable at room temperature but decomposes when heated.
Water Reactivity: Soluble in water; aqueous solutions may slowly decompose releasing oxygen
Extinguishing: Water spray to keep containers cool; dry chemical or CO2 for small fires; avoid organic materials
PPE: Level C minimum with full face respirator; Level B with SCBA if fire involvement or confined space
Isolation: ERG 140: Initial isolation 50m in all directions; protective action distance 100m downwind for large spills during day
— 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/1492 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1492 Potassium persulphate Cls5 ERG140 | ERG 140: Initial isolation 50m in all directions; protective action distance 100 | allfirefighter.com/hazmat/un/1492SMS / 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/1492
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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 C minimum with full face respirator; Level B with SCBA if fire involvement or confined space
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.