☣️ UN 3356 • CLASS 5
Oxygen generator, chemical, spent
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 3356
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
Isolation: ERG 140: isolate spill area 25m in all directions; if fire or explosion risk, isolate 800m and consider evacuation of 800m radius
Chemical & Response Details
| Also known as | Spent oxygen canisterChlorate candle (spent)Oxygen candle (spent)Chemical oxygen generator |
| Appearance | Solid metal canister or cartridge containing residual oxidizing chemicals (typically chlorate salts) and reaction byproducts. May appear as a cylindrical unit with darkened or discolored interior. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Not applicable (solid mixture) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | May react with water if residual chlorates present; avoid direct water contact on hot or damaged units |
| Extinguishing | Use water spray from distance, dry sand, or dry chemical; do not apply foam directly to hot units |
| PPE | ⚠️ Level B minimum; SCBA required; thermal-protective clothing if units are hot; avoid inhalation of decomposition products |
| Isolation | ERG 140: isolate spill area 25m in all directions; if fire or explosion risk, isolate 800m and consider evacuation of 800m radius |
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 3356 — Oxygen generator, chemical, spent HAZMAT RADIO NOTE — UN 3356
Product: Oxygen generator, chemical, spent
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum; SCBA required; thermal-protective clothing if units are hot; avoid inhalation of decomposition products
ISOLATION: ERG 140: isolate spill area 25m in all directions; if fire or explosion risk, isolate 800m and consider evacuation of 800m radius
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 3356 — Oxygen generator, chemical, spent
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Solid metal canister or cartridge containing residual oxidizing chemicals (typically chlorate salts) and reaction byproducts. May appear as a cylindrical unit with darkened or discolored interior.
Water Reactivity: May react with water if residual chlorates present; avoid direct water contact on hot or damaged units
Extinguishing: Use water spray from distance, dry sand, or dry chemical; do not apply foam directly to hot units
PPE: Level B minimum; SCBA required; thermal-protective clothing if units are hot; avoid inhalation of decomposition products
Isolation: ERG 140: isolate spill area 25m in all directions; if fire or explosion risk, isolate 800m and consider evacuation of 800m radius
— 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/3356 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3356 Oxygen generator, chemical, spent Cls5 ERG140 | allfirefighter.com/hazmat/un/3356SMS / 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/3356
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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 B minimum; SCBA required; thermal-protective clothing if units are hot; avoid inhalation of decomposition products
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.