☣️ UN 3386 • CLASS 6
Poisonous by inhalation liquid, water-reactive, 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 3386
Class: 6
Placard type: Toxic
ERG: Guide 139 (check current ERG)
Isolation: ERG 139: Isolate spill area immediately for at least 100m in all directions; consider initial evacuation for 500m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m
Chemical & Response Details
| Also known as | PIH liquid water-reactiveToxic inhalation hazard liquid water-reactiveZone B water-reactive toxic liquidN.O.S. water-reactive poison |
| Appearance | Variable appearance depending on specific substance; typically a liquid at room temperature that reacts with water or moisture. May have various colors and odors depending on the actual chemical identity. |
| Flash Point | Variable by substance; many are flammable or produce flammable gases on contact with water |
| Boiling Point | Variable by substance; refer to specific chemical SDS |
| Vapor Density | Variable by substance; typically heavier than air for toxic vapors produced |
| Water Reactivity | Reacts with water producing toxic and flammable gases; do not use water except as fine spray to control vapors at a distance |
| Extinguishing | Dry chemical, dry sand, or specialized extinguishing agents; avoid water-based agents due to water reactivity |
| PPE | ⚠️ Level A required for unknown substances; minimum Level B with SCBA and full face protection; chemical-resistant suit required; positive pressure SCBA mandatory in vapor areas |
| Isolation | ERG 139: Isolate spill area immediately for at least 100m in all directions; consider initial evacuation for 500m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Produce flammable and toxic gases on contact with water.
- May ignite on contact with water or moist air.
- Some react vigorously or explosively on contact with water.
- May be ignited by heat, sparks or flames.
- May re-ignite after fire is extinguished.
- Some are transported in highly flammable liquids.
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
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
- 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 3386 — Poisonous by inhalation liquid, water-re HAZMAT RADIO NOTE — UN 3386
Product: Poisonous by inhalation liquid, water-reactive, n.o.s. (Inhalation Hazard Zone B)
Class 6 / Toxic / ERG 139
PPE: Level A required for unknown substances; minimum Level B with SCBA and full face protection; chemical-resistant suit required; positive pressure SCBA mandatory in vapor areas
ISOLATION: ERG 139: Isolate spill area immediately for at least 100m in all directions; consider initial evacuation for 500m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m
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 3386 — Poisonous by inhalation liquid, water-reactive, n.o.s. (Inhalation Hazard Zone B)
Class: 6 | Placard: Toxic | ERG Guide: 139
Appearance: Variable appearance depending on specific substance; typically a liquid at room temperature that reacts with water or moisture. May have various colors and odors depending on the actual chemical identity.
Water Reactivity: Reacts with water producing toxic and flammable gases; do not use water except as fine spray to control vapors at a distance
Extinguishing: Dry chemical, dry sand, or specialized extinguishing agents; avoid water-based agents due to water reactivity
PPE: Level A required for unknown substances; minimum Level B with SCBA and full face protection; chemical-resistant suit required; positive pressure SCBA mandatory in vapor areas
Isolation: ERG 139: Isolate spill area immediately for at least 100m in all directions; consider initial evacuation for 500m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m
— Key Hazards —
• Produce flammable and toxic gases on contact with water.
• May ignite on contact with water or moist air.
• Some react vigorously or explosively on contact with water.
— 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/3386 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3386 Poisonous by inhalation liquid, water-reactive, n.o.s. (Inhalation Hazard Zone B) Cls6 ERG139 | allfirefighter.com/hazmat/un/3386SMS / 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/3386
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FAQ
Produce flammable and toxic gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Containers may explode when heated. Runoff may create fire or explosion hazard.
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 unknown substances; minimum Level B with SCBA and full face protection; chemical-resistant suit required; positive pressure SCBA mandatory in vapor areas
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 139 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.