☣️ UN 3378 • CLASS 5
UN 3378 — Sodium carbonate peroxyhydrate
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.
Sodium carbonate peroxyhydrate is a white crystalline or granular solid with a slight chlorine-like odor at room temperature. It is used in various applications, including as an oxidizer and a component in cleaning products.
Hazard overview: These substances will accelerate burning when involved in a fire and some may decompose explosively when heated or involved in a fire.
Response guidance: In case of fire, use dry chemical, CO2, or sand to extinguish. Avoid applying water directly to bulk material, as it can cause vigorous effervescence.
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UN 3378 Quick Details
UN 3378
Product name: Sodium carbonate peroxyhydrate
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate spill 25-50m in all directions; if fire involved, evacuate 800m radius; consider evacuation if tank/container exposed to fire
Common Hazards of UN 3378
- 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
Sodium carbonate peroxyhydrate dissolves in water releasing oxygen and heat.
| Also known as | Sodium percarbonateSodium carbonate hydrogen peroxideSodium carbonate peroxidePCS |
| CAS Number | 15630-89-4 |
| Appearance | White crystalline or granular solid with no odor or slight chlorine-like odor at room temperature. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Not applicable (decomposes above 60C/140F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Dissolves in water releasing oxygen and heat; can cause vigorous effervescence |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3378
Extinguishing Media
Dry chemical, CO2, or sand; avoid applying water directly to bulk material
PPE Requirements
⚠️ Level B minimum with SCBA; chemical-resistant gloves and protective clothing; eye protection required
Use Level B minimum with SCBA, chemical-resistant gloves, and protective clothing, and eye protection is required.
Isolation & Evacuation
ERG 140: isolate spill 25-50m in all directions; if fire involved, evacuate 800m radius; consider evacuation if tank/container exposed to fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 3378 Incident
- 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 3378 — Sodium carbonate peroxyhydrateHAZMAT RADIO NOTE — UN 3378
Product: Sodium carbonate peroxyhydrate
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum with SCBA; chemical-resistant gloves and protective clothing; eye protection required
ISOLATION: ERG 140: isolate spill 25-50m in all directions; if fire involved, evacuate 800m radius; consider evacuation if tank/container exposed to fire
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 3378 — Sodium carbonate peroxyhydrate
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White crystalline or granular solid with no odor or slight chlorine-like odor at room temperature.
Water Reactivity: Dissolves in water releasing oxygen and heat; can cause vigorous effervescence
Extinguishing: Dry chemical, CO2, or sand; avoid applying water directly to bulk material
PPE: Level B minimum with SCBA; chemical-resistant gloves and protective clothing; eye protection required
Isolation: ERG 140: isolate spill 25-50m in all directions; if fire involved, evacuate 800m radius; consider evacuation if tank/container exposed to fire
— 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 —
• 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
SOURCE: allfirefighter.com/hazmat/un/sodium-carbonate-peroxyhydrate-un-3378 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3378 Sodium carbonate peroxyhydrate Cls5 ERG140 | allfirefighter.com/hazmat/un/sodium-carbonate-peroxyhydrate-un-3378SMS / 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-carbonate-peroxyhydrate-un-3378
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Frequently Asked Questions about UN 3378
No, UN 3378 is not flammable, but it can accelerate burning when involved in a fire.
Yes, some UN 3378 substances may decompose explosively when heated or involved in a fire.
Isolate the spill 25-50m in all directions, and consider evacuation if the tank/container is exposed to fire.
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.