☣️ UN 3390 • CLASS 6
Poisonous by inhalation liquid, corrosive, 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 3390
Class: 6
Placard type: Toxic
ERG: Guide 154 (check current ERG)
Isolation: ERG 154: Small spill - isolate 30m all directions. Large spill - isolate 100m all directions, evacuate 300m downwind. If tank/rail car involved in fire, isolate 800m all directions.
Chemical & Response Details
| Also known as | Toxic inhalation hazard liquid corrosive NOSPIH liquid corrosive Zone BCorrosive toxic liquid NOSTIH corrosive liquid |
| Appearance | N.o.s. (not otherwise specified) entry encompasses various corrosive liquids with significant inhalation toxicity. Physical properties vary by specific substance; typically liquids at room temperature with potentially pungent or irritating odors. |
| Flash Point | Varies by specific substance - refer to SDS for actual material |
| Boiling Point | Varies by specific substance - refer to SDS for actual material |
| Vapor Density | Typically heavier than air (>1.0) - refer to SDS for actual material |
| Water Reactivity | May react with water depending on specific substance; corrosive properties may be enhanced. Avoid direct water contact unless specific substance is known to be water-compatible. |
| Extinguishing | Use caution with foam - corrosive nature may break down some foams. Dry chemical, CO2, or appropriate extinguishing agent based on specific substance. Consult ERG 154 for guidance. |
| PPE | ⚠️ Level A required for unknown substances or major spills. SCBA mandatory. Full chemical-resistant suit with double gloves. Avoid all skin and eye contact. Respiratory protection critical due to inhalation hazard classification. |
| Isolation | ERG 154: Small spill - isolate 30m all directions. Large spill - isolate 100m all directions, evacuate 300m downwind. If tank/rail car involved in fire, isolate 800m all directions. |
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 3390 — Poisonous by inhalation liquid, corrosiv HAZMAT RADIO NOTE — UN 3390
Product: Poisonous by inhalation liquid, corrosive, n.o.s. (Inhalation Hazard Zone B)
Class 6 / Toxic / ERG 154
PPE: Level A required for unknown substances or major spills. SCBA mandatory. Full chemical-resistant suit with double gloves. Avoid all skin and eye contact. Respiratory protection critical due to inhalation hazard classification.
ISOLATION: ERG 154: Small spill - isolate 30m all directions. Large spill - isolate 100m all directions, evacuate 300m downwind. If tank/rail car involved in fire, isolate 800m all directions.
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 3390 — Poisonous by inhalation liquid, corrosive, n.o.s. (Inhalation Hazard Zone B)
Class: 6 | Placard: Toxic | ERG Guide: 154
Appearance: N.o.s. (not otherwise specified) entry encompasses various corrosive liquids with significant inhalation toxicity. Physical properties vary by specific substance; typically liquids at room temperature with potentially pungent or irritating odors.
Water Reactivity: May react with water depending on specific substance; corrosive properties may be enhanced. Avoid direct water contact unless specific substance is known to be water-compatible.
Extinguishing: Use caution with foam - corrosive nature may break down some foams. Dry chemical, CO2, or appropriate extinguishing agent based on specific substance. Consult ERG 154 for guidance.
PPE: Level A required for unknown substances or major spills. SCBA mandatory. Full chemical-resistant suit with double gloves. Avoid all skin and eye contact. Respiratory protection critical due to inhalation hazard classification.
Isolation: ERG 154: Small spill - isolate 30m all directions. Large spill - isolate 100m all directions, evacuate 300m downwind. If tank/rail car involved in fire, isolate 800m all directions.
— 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/3390 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3390 Poisonous by inhalation liquid, corrosive, n.o.s. (Inhalation Hazard Zone B) Cls6 ERG154 | allfirefighter.com/hazmat/un/3390SMS / 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/3390
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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 unknown substances or major spills. SCBA mandatory. Full chemical-resistant suit with double gloves. Avoid all skin and eye contact. Respiratory protection critical due to inhalation hazard classification.
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.