☣️ UN 3389 • CLASS 6
Poisonous by inhalation liquid, corrosive, 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 3389
Class: 6
Placard type: Toxic
ERG: Guide 154 (check current ERG)
Isolation: ERG 154: Initial isolation 100m all directions; Protective action distance 0.5km daytime, 1.1km nighttime for small spill; 1.3km daytime, 3.7km nighttime for large spill
Chemical & Response Details
| Also known as | PIH liquid corrosive Zone AToxic inhalation hazard liquid corrosiveTIH corrosive liquid n.o.s.Poisonous corrosive liquid Zone A |
| Appearance | Variable appearance depending on specific substance; may be colorless to colored liquid with irritating or pungent odor. Corrosive properties cause severe tissue damage on contact. |
| Flash Point | Variable - depends on specific chemical identity |
| Boiling Point | Variable - depends on specific chemical identity |
| Vapor Density | Typically >1 (heavier than air) - specific value depends on chemical identity |
| Water Reactivity | Variable - may react with water generating heat or toxic/corrosive gases depending on specific substance |
| Extinguishing | Use water spray to reduce vapors; avoid direct contact with liquid; dry chemical or CO2 for small fires if chemical permits |
| PPE | ⚠️ Level A required for Zone A materials; Full encapsulating suit with SCBA; vapor-protective chemical resistant suit mandatory |
| Isolation | ERG 154: Initial isolation 100m all directions; Protective action distance 0.5km daytime, 1.1km nighttime for small spill; 1.3km daytime, 3.7km nighttime for large spill |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Contact with molten substance may cause severe burns to skin and eyes.
- 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
- Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.).
- Corrosives in contact with metals may evolve flammable hydrogen gas.
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 3389 — Poisonous by inhalation liquid, corrosiv HAZMAT RADIO NOTE — UN 3389
Product: Poisonous by inhalation liquid, corrosive, n.o.s. (Inhalation Hazard Zone A)
Class 6 / Toxic / ERG 154
PPE: Level A required for Zone A materials; Full encapsulating suit with SCBA; vapor-protective chemical resistant suit mandatory
ISOLATION: ERG 154: Initial isolation 100m all directions; Protective action distance 0.5km daytime, 1.1km nighttime for small spill; 1.3km daytime, 3.7km nighttime for large spill
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 3389 — Poisonous by inhalation liquid, corrosive, n.o.s. (Inhalation Hazard Zone A)
Class: 6 | Placard: Toxic | ERG Guide: 154
Appearance: Variable appearance depending on specific substance; may be colorless to colored liquid with irritating or pungent odor. Corrosive properties cause severe tissue damage on contact.
Water Reactivity: Variable - may react with water generating heat or toxic/corrosive gases depending on specific substance
Extinguishing: Use water spray to reduce vapors; avoid direct contact with liquid; dry chemical or CO2 for small fires if chemical permits
PPE: Level A required for Zone A materials; Full encapsulating suit with SCBA; vapor-protective chemical resistant suit mandatory
Isolation: ERG 154: Initial isolation 100m all directions; Protective action distance 0.5km daytime, 1.1km nighttime for small spill; 1.3km daytime, 3.7km nighttime for large spill
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• Contact with molten substance may cause severe burns to skin and eyes.
• Avoid any skin contact.
— 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/3389 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3389 Poisonous by inhalation liquid, corrosive, n.o.s. (Inhalation Hazard Zone A) Cls6 ERG154 | allfirefighter.com/hazmat/un/3389SMS / 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/3389
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FAQ
TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury Contact with molten substance may cause severe burns to skin and eyes. 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 Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Corrosives in contact with metals may evolve flammable hydrogen gas.
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; Full encapsulating suit with SCBA; vapor-protective chemical resistant suit mandatory
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 154 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.