☣️ UN 3247 • CLASS 5
Sodium peroxoborate, anhydrous
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 3247
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
Isolation: ERG 140: isolate spill 25-50m in all directions; for large fire isolate 800m and consider evacuation; keep away from combustibles
Chemical & Response Details
| Also known as | Sodium perboratePeroxoborate de sodiumSodium peroxyborateSodium tetraborate peroxide |
| CAS Number | 7632-04-4 |
| Appearance | White to off-white granular powder or crystalline solid, odorless. Hygroscopic material that is stable at room temperature when dry. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Decomposes at approximately 60-70C (140-158F) releasing oxygen |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water, hydrolyzes to form hydrogen peroxide and borate; exothermic dissolution may occur |
| Extinguishing | Dry chemical, CO2, or water spray for surrounding fire; avoid incompatible materials like organic matter |
| PPE | ⚠️ Level C minimum for handling; SCBA and full protective clothing required for fire involvement; eye and skin protection mandatory |
| Isolation | ERG 140: isolate spill 25-50m in all directions; for large fire isolate 800m and consider evacuation; keep away from combustibles |
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 3247 — Sodium peroxoborate, anhydrous HAZMAT RADIO NOTE — UN 3247
Product: Sodium peroxoborate, anhydrous
Class 5 / Oxidizer / ERG 140
PPE: Level C minimum for handling; SCBA and full protective clothing required for fire involvement; eye and skin protection mandatory
ISOLATION: ERG 140: isolate spill 25-50m in all directions; for large fire isolate 800m and consider evacuation; keep away from combustibles
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 3247 — Sodium peroxoborate, anhydrous
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White to off-white granular powder or crystalline solid, odorless. Hygroscopic material that is stable at room temperature when dry.
Water Reactivity: Soluble in water, hydrolyzes to form hydrogen peroxide and borate; exothermic dissolution may occur
Extinguishing: Dry chemical, CO2, or water spray for surrounding fire; avoid incompatible materials like organic matter
PPE: Level C minimum for handling; SCBA and full protective clothing required for fire involvement; eye and skin protection mandatory
Isolation: ERG 140: isolate spill 25-50m in all directions; for large fire isolate 800m and consider evacuation; keep away from combustibles
— 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/3247 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3247 Sodium peroxoborate, anhydrous Cls5 ERG140 | allfirefighter.com/hazmat/un/3247SMS / 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/3247
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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 for handling; SCBA and full protective clothing required for fire involvement; eye and skin protection mandatory
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.