☣️ 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.
UN 3377 is Sodium perborate monohydrate, assigned to ERG Guide 140. First responders should verify the shipping papers and SDS, isolate the area, and base entry, PPE and control tactics on the product's listed hazards.
Hazard overview: The main hazard is oxidizing behavior: it can accelerate burning, react with combustibles, and produce irritating or toxic gases in fire.
Response guidance: For UN 3377, isolate the spill, remove fuels and organic materials, cool containers from distance, prevent runoff, and use ERG 140 for evacuation decisions.
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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 death.
Chemical Identity & Physical Properties
White, odorless crystalline powder or granular solid at room temperature. Stable under normal conditions but decomposes when heated.
| 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
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 the emergency response telephone number on the shipping paper, if available.
- 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 the emergency response telephone number on the shipping paper, if available.
• 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/sodium-perborate-monohydrate-un-3377 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3377 Sodium perborate monohydrate Cls5 ERG140 | allfirefighter.com/hazmat/un/sodium-perborate-monohydrate-un-3377SMS / 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/sodium-perborate-monohydrate-un-3377
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Frequently Asked Questions about UN 3377
UN 3377 is Sodium perborate monohydrate. It is assigned to ERG Guide 140 for initial emergency response.
It is not primarily a fuel, but it is an oxidizer or energetic material that can intensify fire and make combustibles burn faster.
Keep fuels, organic materials, reducing agents, heat and ignition sources away from the material.
Use chemical-resistant protective clothing and SCBA when dust, decomposition gases, fire or large spill conditions are present.
Keep unauthorized personnel away, isolate the spill area and use ERG 140 for fire or evacuation distances.
Heating can release oxygen or irritating gases and may increase fire intensity or decomposition risk.
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.