☣️ UN 3384 • CLASS 6
UN 3384 — Poisonous by inhalation liquid, flammable, n.o.s. (Inhalation Hazard Zone B)
Placard: Toxic. ERG Guide 131. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ Verification required:
Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ 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.
UN 3384 is Poisonous by inhalation liquid, flammable, n.o.s. (Inhalation Hazard Zone B), a not-otherwise-specified hazmat entry assigned to ERG Guide 131. The exact product name on shipping papers and the SDS determine the final hazards, but initial response should assume the listed DOT hazard until proven otherwise.
Hazard overview: Zone B inhalation toxicity is the controlling hazard; flammable vapor/flashback risk. Treat unknown releases as immediately dangerous.
Response guidance: For UN 3384, establish hot/warm/cold zones, isolate the area, evacuate downwind as ERG 131 directs, control ignition if flammable, and wait for trained hazmat entry with monitoring.
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UN 3384 Quick Details
UN 3384
Product name: Poisonous by inhalation liquid, flammable, n.o.s. (Inhalation Hazard Zone B)
DOT Class: 6
Placard type: Toxic
ERG Guide: 131 (check current ERG)
Initial isolation: ERG 131: isolate spill 100m in all directions initially; evacuate downwind 800m (day) or 1600m (night) for large spills; Inhalation Hazard Zone B requires expanded evacuation distances
Common Hazards of UN 3384
- TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
- Inhalation or contact with some of these materials will irritate or burn skin and eyes.
- Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
- Fire will produce irritating, corrosive and/or toxic gases.
- Vapors may cause dizziness or asphyxiation, especially when in closed or confined areas.
- Runoff from fire control or dilution water may cause environmental contamination.
- HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
- Vapors may form explosive mixtures with air.
Chemical Identity & Physical Properties
Variable liquid (n.o.s. entry covers multiple chemicals). Typically colorless to amber liquid with variable odor depending on specific substance. Flammable and highly toxic by inhalation.
| Also known as | Toxic inhalation hazard liquidPIH liquid Zone BFlammable poisonous liquid n.o.s.TIH liquid flammable |
| Appearance | Variable liquid (n.o.s. entry covers multiple chemicals). Typically colorless to amber liquid with variable odor depending on specific substance. Flammable and highly toxic by inhalation. |
| Flash Point | Variable, but below 23C (73F) as flammable liquid |
| Boiling Point | Variable depending on specific chemical covered by this n.o.s. entry |
| Vapor Density | Typically heavier than air (>1) for most chemicals in this category |
| Water Reactivity | Variable — some may react, most stable in water but toxic vapors may be released |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3384
Extinguishing Media
Alcohol-resistant foam, dry chemical, CO2 — water spray for cooling only
PPE Requirements
⚠️ Level A required (fully encapsulating suit with SCBA) due to inhalation hazard Zone B; vapor-protective chemical suit mandatory
Level A vapor-protective PPE with positive-pressure SCBA is appropriate for unknown or active releases. Avoid all skin contact and downgrade only after monitoring and product identification.
Isolation & Evacuation
ERG 131: isolate spill 100m in all directions initially; evacuate downwind 800m (day) or 1600m (night) for large spills; Inhalation Hazard Zone B requires expanded evacuation distances
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 131).
First Actions for a UN 3384 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- 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 direction.
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📋 Copy & Share Field Card
UN 3384 — Poisonous by inhalation liquid, flammablHAZMAT RADIO NOTE — UN 3384
Product: Poisonous by inhalation liquid, flammable, n.o.s. (Inhalation Hazard Zone B)
Class 6 / Toxic / ERG 131
PPE: Level A required (fully encapsulating suit with SCBA) due to inhalation hazard Zone B; vapor-protective chemical suit mandatory
ISOLATION: ERG 131: isolate spill 100m in all directions initially; evacuate downwind 800m (day) or 1600m (night) for large spills; Inhalation Hazard Zone B requires expanded evacuation distances
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 3384 — Poisonous by inhalation liquid, flammable, n.o.s. (Inhalation Hazard Zone B)
Class: 6 | Placard: Toxic | ERG Guide: 131
Appearance: Variable liquid (n.o.s. entry covers multiple chemicals). Typically colorless to amber liquid with variable odor depending on specific substance. Flammable and highly toxic by inhalation.
Water Reactivity: Variable — some may react, most stable in water but toxic vapors may be released
Extinguishing: Alcohol-resistant foam, dry chemical, CO2 — water spray for cooling only
PPE: Level A required (fully encapsulating suit with SCBA) due to inhalation hazard Zone B; vapor-protective chemical suit mandatory
Isolation: ERG 131: isolate spill 100m in all directions initially; evacuate downwind 800m (day) or 1600m (night) for large spills; Inhalation Hazard Zone B requires expanded evacuation distances
— Key Hazards —
• TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
• Inhalation or contact with some of these materials will irritate or burn skin and eyes.
• Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
— First Actions —
• CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
• 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/poisonous-by-inhalation-liquid-un-3384 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3384 Poisonous by inhalation liquid, flammable, n.o.s. (Inhalation Hazard Zone B) Cls6 ERG131 | allfirefighter.com/hazmat/un/poisonous-by-inhalation-liquid-un-3384SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/poisonous-by-inhalation-liquid-un-3384
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Frequently Asked Questions about UN 3384
UN 3384 is Poisonous by inhalation liquid, flammable, n.o.s. (Inhalation Hazard Zone B). It is assigned to ERG Guide 131 for initial emergency response.
The main hazard is poisonous vapor exposure by inhalation (Zone B). Skin contact and ingestion may also be dangerous depending on the exact chemical.
Use Level A vapor-protective chemical suit with positive-pressure SCBA for unknown or active releases. Downgrade only after monitoring and product identification.
Yes. Control ignition sources, expect vapors to travel and flash back, and use alcohol-resistant foam, dry chemical or CO2 when compatible.
Because n.o.s. PIH entries cover multiple chemicals. The exact name, concentration and SDS determine final PPE, isolation and control tactics.
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.