☣️ UN 3385 • CLASS 6
Poisonous by inhalation liquid, water-reactive, 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 3385
Class: 6
Placard type: Toxic
ERG: Guide 139 (check current ERG)
Isolation: ERG 139: Isolate spill 100m all directions initially; large spill isolate 800m downwind; evacuate immediate area if fire involves this material
Chemical & Response Details
| Also known as | Toxic by inhalation liquid, water-reactivePIH liquid water-reactive Zone AWater-reactive toxic liquid n.o.s.Inhalation hazard liquid water-reactive |
| Appearance | Variable appearance depending on specific substance; may be colorless to colored liquid. N.o.s. entry covers multiple water-reactive toxic liquids that produce flammable and toxic gases on contact with water. |
| Flash Point | Variable - depends on specific substance; many are flammable or produce flammable gases |
| Boiling Point | Variable - depends on specific substance |
| Vapor Density | Typically heavier than air; vapors accumulate in low areas creating extreme inhalation hazard |
| Water Reactivity | Reacts vigorously to violently with water producing flammable and toxic gases; may ignite spontaneously on contact with water or moist air |
| Extinguishing | Dry chemical, dry sand, soda ash, or lime only; DO NOT USE WATER, foam, or water-based agents |
| PPE | ⚠️ Level A required; SCBA with full facepiece positive pressure; chemical-resistant suit; extreme inhalation hazard Zone A designation |
| Isolation | ERG 139: Isolate spill 100m all directions initially; large spill isolate 800m downwind; evacuate immediate area if fire involves this material |
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 3385 — Poisonous by inhalation liquid, water-re HAZMAT RADIO NOTE — UN 3385
Product: Poisonous by inhalation liquid, water-reactive, n.o.s. (Inhalation Hazard Zone A)
Class 6 / Toxic / ERG 139
PPE: Level A required; SCBA with full facepiece positive pressure; chemical-resistant suit; extreme inhalation hazard Zone A designation
ISOLATION: ERG 139: Isolate spill 100m all directions initially; large spill isolate 800m downwind; evacuate immediate area if fire involves this material
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 3385 — Poisonous by inhalation liquid, water-reactive, n.o.s. (Inhalation Hazard Zone A)
Class: 6 | Placard: Toxic | ERG Guide: 139
Appearance: Variable appearance depending on specific substance; may be colorless to colored liquid. N.o.s. entry covers multiple water-reactive toxic liquids that produce flammable and toxic gases on contact with water.
Water Reactivity: Reacts vigorously to violently with water producing flammable and toxic gases; may ignite spontaneously on contact with water or moist air
Extinguishing: Dry chemical, dry sand, soda ash, or lime only; DO NOT USE WATER, foam, or water-based agents
PPE: Level A required; SCBA with full facepiece positive pressure; chemical-resistant suit; extreme inhalation hazard Zone A designation
Isolation: ERG 139: Isolate spill 100m all directions initially; large spill isolate 800m downwind; evacuate immediate area if fire involves this material
— 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/3385 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3385 Poisonous by inhalation liquid, water-reactive, n.o.s. (Inhalation Hazard Zone A) Cls6 ERG139 | allfirefighter.com/hazmat/un/3385SMS / 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/3385
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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; SCBA with full facepiece positive pressure; chemical-resistant suit; extreme inhalation hazard Zone A designation
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.