☣️ UN 3377 • CLASS 5
UN 3377 — Sodium perborate monohydrate
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.
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UN 3377 Quick Details
UN 3377
Product name: Sodium perborate monohydrate
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate spill 25-50m; if fire, isolate 800m all directions and consider evacuation 1600m downwind
Common Hazards of UN 3377
- 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
Chemical Identity & Physical Properties
| Also known as | Sodium perborate monohydratePerborax monohydrateSodium peroxoborate monohydratePBS-1 |
| CAS Number | 10332-33-9 |
| Appearance | White, odorless crystalline powder or granular solid at room temperature. Stable under normal conditions but decomposes when heated. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Not applicable (decomposes above 60C/140F releasing oxygen) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Slowly soluble in water forming hydrogen peroxide and borate; no violent reaction but generates heat |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3377
Extinguishing Media
Water spray, dry chemical, or CO2; avoid organic materials near fire
PPE Requirements
⚠️ Level C minimum with dust respirator; Level B with SCBA if fire/decomposition involved; chemical-resistant gloves and eye protection required
Isolation & Evacuation
ERG 140: isolate spill 25-50m; if fire, isolate 800m all directions and consider evacuation 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 3377 Incident
- 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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📋 Copy & Share Field Card
UN 3377 — Sodium perborate monohydrateHAZMAT RADIO NOTE — UN 3377
Product: Sodium perborate monohydrate
Class 5 / Oxidizer / ERG 140
PPE: Level C minimum with dust respirator; Level B with SCBA if fire/decomposition involved; chemical-resistant gloves and eye protection required
ISOLATION: ERG 140: isolate spill 25-50m; if fire, isolate 800m all directions 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 3377 — Sodium perborate monohydrate
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White, odorless crystalline powder or granular solid at room temperature. Stable under normal conditions but decomposes when heated.
Water Reactivity: Slowly soluble in water forming hydrogen peroxide and borate; no violent reaction but generates heat
Extinguishing: Water spray, dry chemical, or CO2; avoid organic materials near fire
PPE: Level C minimum with dust respirator; Level B with SCBA if fire/decomposition involved; chemical-resistant gloves and eye protection required
Isolation: ERG 140: isolate spill 25-50m; if fire, isolate 800m all directions 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/3377 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3377 Sodium perborate monohydrate Cls5 ERG140 | allfirefighter.com/hazmat/un/3377SMS / 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/3377
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Frequently Asked Questions about UN 3377
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 dust respirator; Level B with SCBA if fire/decomposition involved; chemical-resistant gloves and eye protection required
Water reactivity: Slowly soluble in water forming hydrogen peroxide and borate; no violent reaction but generates heat. Recommended extinguishing: Water spray, dry chemical, or CO2; avoid organic materials near fire.
ERG Guide 140 recommendation: ERG 140: isolate spill 25-50m; if fire, isolate 800m all directions and consider evacuation 1600m downwind
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.