☣️ UN 3381 • CLASS 6
Poisonous by inhalation liquid, n.o.s. (Inhalation Hazard Zone A)
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 3381
Class: 6
Placard type: Toxic
ERG: Guide 151 (check current ERG)
Isolation: ERG 151: Isolate spill 100m in all directions; evacuate 800m downwind during day, 1600m at night; larger distances for tank/rail car spills
Chemical & Response Details
| Also known as | Toxic liquid PIH Zone AInhalation hazard liquid Zone APoisonous liquid n.o.s.PIH liquid Zone A |
| Appearance | Variable liquid; color, odor, and physical properties depend on specific substance. This is a generic shipping category for highly toxic liquids that present severe inhalation hazards (Zone A indicates LC50 ≤1000 ppm). |
| Flash Point | Variable depending on specific substance; may range from highly flammable to non-flammable |
| Boiling Point | Variable depending on specific substance |
| Vapor Density | Variable depending on specific substance; typically heavier than air for most toxic liquids |
| Water Reactivity | Variable; some substances may react with water, consult specific chemical data |
| Extinguishing | Use alcohol-resistant foam if flammable; avoid water spray directly on liquid; consult ERG 151 for specific guidance |
| PPE | ⚠️ Level A required for Zone A materials; fully encapsulated suit with SCBA; no skin contact permitted; positive pressure SCBA mandatory |
| Isolation | ERG 151: Isolate spill 100m in all directions; evacuate 800m downwind during day, 1600m at night; larger distances for tank/rail car spills |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- Containers may explode when heated.
- Runoff may pollute waterways.
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.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- 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 3381 — Poisonous by inhalation liquid, n.o.s. ( HAZMAT RADIO NOTE — UN 3381
Product: Poisonous by inhalation liquid, n.o.s. (Inhalation Hazard Zone A)
Class 6 / Toxic / ERG 151
PPE: Level A required for Zone A materials; fully encapsulated suit with SCBA; no skin contact permitted; positive pressure SCBA mandatory
ISOLATION: ERG 151: Isolate spill 100m in all directions; evacuate 800m downwind during day, 1600m at night; larger distances for tank/rail car spills
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 3381 — Poisonous by inhalation liquid, n.o.s. (Inhalation Hazard Zone A)
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Variable liquid; color, odor, and physical properties depend on specific substance. This is a generic shipping category for highly toxic liquids that present severe inhalation hazards (Zone A indicates LC50 ≤1000 ppm).
Water Reactivity: Variable; some substances may react with water, consult specific chemical data
Extinguishing: Use alcohol-resistant foam if flammable; avoid water spray directly on liquid; consult ERG 151 for specific guidance
PPE: Level A required for Zone A materials; fully encapsulated suit with SCBA; no skin contact permitted; positive pressure SCBA mandatory
Isolation: ERG 151: Isolate spill 100m in all directions; evacuate 800m downwind during day, 1600m at night; larger distances for tank/rail car spills
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Avoid any skin contact.
• Fire may produce irritating, corrosive and/or toxic gases.
— 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.
• 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/3381 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3381 Poisonous by inhalation liquid, n.o.s. (Inhalation Hazard Zone A) Cls6 ERG151 | allfirefighter.com/hazmat/un/3381SMS / 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/3381
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FAQ
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. Avoid any skin contact. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive Containers may explode when heated. Runoff may pollute waterways.
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 A materials; fully encapsulated suit with SCBA; no skin contact permitted; positive pressure SCBA mandatory
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 151 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.