☣️ UN 3388 • CLASS 6
Poisonous by inhalation liquid, oxidizing, n.o.s. (Inhalation Hazard Zone B)
Placard: Toxic. 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 3388
Class: 6
Placard type: Toxic
ERG: Guide 142 (check current ERG)
Isolation: ERG 142: Isolate spill 100m all directions; consider evacuation 500m downwind for large spills; isolate 800m all directions if tank/rail car involved in fire
Chemical & Response Details
| Also known as | Toxic oxidizing liquid NOSPIH liquid oxidizing Zone BOxidizing toxic liquid n.o.s.Poisonous oxidizer liquid |
| Appearance | Variable appearance depending on specific substance. Typically a liquid at room temperature. May be clear to colored. Odor varies by composition. Exhibits strong oxidizing properties. |
| Flash Point | Not applicable (oxidizing liquid) |
| Boiling Point | Variable, depends on specific substance |
| Vapor Density | Variable, typically heavier than air |
| Water Reactivity | May react with water depending on composition; contact with combustible materials may cause fire |
| Extinguishing | Dry chemical, CO2, or dry sand preferred; avoid contact with organic materials; water spray for cooling only |
| PPE | ⚠️ Level A required for Zone B inhalation hazard; SCBA mandatory; fully encapsulating chemical protective suit; avoid all contact |
| Isolation | ERG 142: Isolate spill 100m all directions; consider evacuation 500m downwind for large spills; isolate 800m all directions if tank/rail car involved in fire |
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.
- 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.
- TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury,
- Fire may produce irritating, corrosive and/or toxic gases.
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 for at least 50 meters (150 feet) in all directions.
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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UN 3388 — Poisonous by inhalation liquid, oxidizin HAZMAT RADIO NOTE — UN 3388
Product: Poisonous by inhalation liquid, oxidizing, n.o.s. (Inhalation Hazard Zone B)
Class 6 / Toxic / ERG 142
PPE: Level A required for Zone B inhalation hazard; SCBA mandatory; fully encapsulating chemical protective suit; avoid all contact
ISOLATION: ERG 142: Isolate spill 100m all directions; consider evacuation 500m downwind for large spills; isolate 800m all directions if tank/rail car involved in 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 3388 — Poisonous by inhalation liquid, oxidizing, n.o.s. (Inhalation Hazard Zone B)
Class: 6 | Placard: Toxic | ERG Guide: 142
Appearance: Variable appearance depending on specific substance. Typically a liquid at room temperature. May be clear to colored. Odor varies by composition. Exhibits strong oxidizing properties.
Water Reactivity: May react with water depending on composition; contact with combustible materials may cause fire
Extinguishing: Dry chemical, CO2, or dry sand preferred; avoid contact with organic materials; water spray for cooling only
PPE: Level A required for Zone B inhalation hazard; SCBA mandatory; fully encapsulating chemical protective suit; avoid all contact
Isolation: ERG 142: Isolate spill 100m all directions; consider evacuation 500m downwind for large spills; isolate 800m all directions if tank/rail car involved in fire
— Key Hazards —
• These substances will accelerate burning when involved in a fire.
• May explode from heat or contamination.
• Some will react explosively with hydrocarbons (fuels).
— 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/3388 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3388 Poisonous by inhalation liquid, oxidizing, n.o.s. (Inhalation Hazard Zone B) Cls6 ERG142 | allfirefighter.com/hazmat/un/3388SMS / 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/3388
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FAQ
These substances will accelerate burning when 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. TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, Fire may produce irritating, corrosive and/or toxic gases.
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 A required for Zone B inhalation hazard; SCBA mandatory; fully encapsulating chemical protective suit; avoid all contact
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 142 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.