☣️ UN 3387 • CLASS 6
UN 3387 — Poisonous by inhalation liquid, oxidizing, n.o.s. (Inhalation Hazard Zone A)
Placard: Toxic. ERG Guide 142. 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 3387 Quick Details
UN 3387
Product name: Poisonous by inhalation liquid, oxidizing, n.o.s. (Inhalation Hazard Zone A)
DOT Class: 6
Placard type: Toxic
ERG Guide: 142 (check current ERG)
Initial isolation: ERG 142: Initial isolation 200m all directions; Protective action distance 1.1km (day) to 3.2km (night) for large spills; evacuate immediately due to Zone A inhalation toxicity
Common Hazards of UN 3387
- 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.
Chemical Identity & Physical Properties
| Also known as | Toxic by inhalation liquid, oxidizing, n.o.s.PIH liquid oxidizer Zone AOxidizing toxic liquid n.o.s.Hazard Zone A oxidizing poison |
| Appearance | Variable appearance depending on specific substance; n.o.s. designation covers multiple oxidizing liquids with severe inhalation toxicity. Typically corrosive liquids with pungent or irritating odors. |
| Flash Point | Not applicable (oxidizing agent, not flammable but supports combustion) |
| Boiling Point | Variable depending on specific substance |
| Vapor Density | Variable, typically heavier than air (vapors present severe inhalation hazard) |
| Water Reactivity | May react violently with water depending on specific oxidizer; assume reactive until confirmed otherwise |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3387
Extinguishing Media
Dry chemical, CO2, sand only; NO WATER or foam due to oxidizing nature and potential violent reaction
PPE Requirements
⚠️ Level A required (fully encapsulating suit with SCBA); severe inhalation hazard Zone A designation requires maximum respiratory protection
Isolation & Evacuation
ERG 142: Initial isolation 200m all directions; Protective action distance 1.1km (day) to 3.2km (night) for large spills; evacuate immediately due to Zone A inhalation toxicity
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 142).
First Actions for a UN 3387 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 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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📋 Copy & Share Field Card
UN 3387 — Poisonous by inhalation liquid, oxidizinHAZMAT RADIO NOTE — UN 3387
Product: Poisonous by inhalation liquid, oxidizing, n.o.s. (Inhalation Hazard Zone A)
Class 6 / Toxic / ERG 142
PPE: Level A required (fully encapsulating suit with SCBA); severe inhalation hazard Zone A designation requires maximum respiratory protection
ISOLATION: ERG 142: Initial isolation 200m all directions; Protective action distance 1.1km (day) to 3.2km (night) for large spills; evacuate immediately due to Zone A inhalation toxicity
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 3387 — Poisonous by inhalation liquid, oxidizing, n.o.s. (Inhalation Hazard Zone A)
Class: 6 | Placard: Toxic | ERG Guide: 142
Appearance: Variable appearance depending on specific substance; n.o.s. designation covers multiple oxidizing liquids with severe inhalation toxicity. Typically corrosive liquids with pungent or irritating odors.
Water Reactivity: May react violently with water depending on specific oxidizer; assume reactive until confirmed otherwise
Extinguishing: Dry chemical, CO2, sand only; NO WATER or foam due to oxidizing nature and potential violent reaction
PPE: Level A required (fully encapsulating suit with SCBA); severe inhalation hazard Zone A designation requires maximum respiratory protection
Isolation: ERG 142: Initial isolation 200m all directions; Protective action distance 1.1km (day) to 3.2km (night) for large spills; evacuate immediately due to Zone A inhalation toxicity
— 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/3387 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3387 Poisonous by inhalation liquid, oxidizing, n.o.s. (Inhalation Hazard Zone A) Cls6 ERG142 | allfirefighter.com/hazmat/un/3387SMS / 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/3387
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Frequently Asked Questions about UN 3387
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 (fully encapsulating suit with SCBA); severe inhalation hazard Zone A designation requires maximum respiratory protection
Water reactivity: May react violently with water depending on specific oxidizer; assume reactive until confirmed otherwise. Recommended extinguishing: Dry chemical, CO2, sand only; NO WATER or foam due to oxidizing nature and potential violent reaction.
ERG Guide 142 recommendation: ERG 142: Initial isolation 200m all directions; Protective action distance 1.1km (day) to 3.2km (night) for large spills; evacuate immediately due to Zone A inhalation toxicity
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.