☣️ UN 3290 • CLASS 6
UN 3290 — Poisonous solid, corrosive, inorganic, n.o.s.
Placard: Toxic. ERG Guide 154. 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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UN 3290 Quick Details
UN 3290
Product name: Poisonous solid, corrosive, inorganic, n.o.s.
DOT Class: 6
Placard type: Toxic
ERG Guide: 154 (check current ERG)
Initial isolation: ERG 154: Initial isolation 25m in all directions; protective action distance up to 800m downwind for large spills; immediate evacuation zone for fire
Common Hazards of UN 3290
- 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.
Chemical Identity & Physical Properties
| Also known as | Toxic solid corrosive inorganic NOSPoisonous corrosive inorganic solidCorrosive toxic inorganic materialClass 6.1 corrosive solid |
| Appearance | Variable appearance as n.o.s. (not otherwise specified) entry covers multiple inorganic compounds. Typically a solid material that may be crystalline, powder, or granular form with color and odor dependent on specific substance. |
| Flash Point | Not applicable (non-flammable inorganic solid) |
| Boiling Point | Variable; depends on specific inorganic compound covered under this n.o.s. entry |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | May react with water to release toxic/corrosive fumes; consult specific material safety data |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3290
Extinguishing Media
Dry chemical, sand, or appropriate agent for specific compound; avoid water unless material-specific data confirms safe
PPE Requirements
⚠️ Level A or B required; full chemical protective suit, SCBA mandatory; avoid all skin/eye contact due to severe corrosive and toxic properties
Isolation & Evacuation
ERG 154: Initial isolation 25m in all directions; protective action distance up to 800m downwind for large spills; immediate evacuation zone for fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 154).
First Actions for a UN 3290 Incident
- 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 3290 — Poisonous solid, corrosive, inorganic, nHAZMAT RADIO NOTE — UN 3290
Product: Poisonous solid, corrosive, inorganic, n.o.s.
Class 6 / Toxic / ERG 154
PPE: Level A or B required; full chemical protective suit, SCBA mandatory; avoid all skin/eye contact due to severe corrosive and toxic properties
ISOLATION: ERG 154: Initial isolation 25m in all directions; protective action distance up to 800m downwind for large spills; immediate evacuation zone for fire
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 3290 — Poisonous solid, corrosive, inorganic, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 154
Appearance: Variable appearance as n.o.s. (not otherwise specified) entry covers multiple inorganic compounds. Typically a solid material that may be crystalline, powder, or granular form with color and odor dependent on specific substance.
Water Reactivity: May react with water to release toxic/corrosive fumes; consult specific material safety data
Extinguishing: Dry chemical, sand, or appropriate agent for specific compound; avoid water unless material-specific data confirms safe
PPE: Level A or B required; full chemical protective suit, SCBA mandatory; avoid all skin/eye contact due to severe corrosive and toxic properties
Isolation: ERG 154: Initial isolation 25m in all directions; protective action distance up to 800m downwind for large spills; immediate evacuation zone for fire
— 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/3290 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3290 Poisonous solid, corrosive, inorganic, n.o.s. Cls6 ERG154 | allfirefighter.com/hazmat/un/3290SMS / 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/3290
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Frequently Asked Questions about UN 3290
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 or B required; full chemical protective suit, SCBA mandatory; avoid all skin/eye contact due to severe corrosive and toxic properties
Water reactivity: May react with water to release toxic/corrosive fumes; consult specific material safety data. Recommended extinguishing: Dry chemical, sand, or appropriate agent for specific compound; avoid water unless material-specific data confirms safe.
ERG Guide 154 recommendation: ERG 154: Initial isolation 25m in all directions; protective action distance up to 800m downwind for large spills; immediate evacuation zone for fire
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.