☣️ 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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⚠️ 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.
Poisonous solid, corrosive, inorganic, n.o.s. is both toxic and corrosive, so responders must treat any unknown release as a contact, inhalation and burn hazard until the exact inorganic compound is identified.
Hazard overview: Toxic corrosive inorganic solid can cause poisoning and severe chemical burns. Heating, fire or incompatible water contact may produce toxic or corrosive vapors, and some formulations can react with metals.
Response guidance: Isolate the area, stay upwind and avoid direct liquid or solid contact. Use ERG Guide 154, shipping papers and SDS to choose compatible control agents and protect drains from contaminated runoff.
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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 toxic, corrosive or environmentally harmful.
- The substance may decompose when heated and produce corrosive or toxic fumes.
- 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
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.
| 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
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 contact the emergency response telephone number shown on shipping papers, 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 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 downwind protective distance based on conditions and incident command guidance.
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📋 Copy & Share Field Card
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 contact the emergency response telephone number shown on shipping papers, 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-solid-corrosive-inorganic-un-3290 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3290 Poisonous solid, corrosive, inorganic, n.o.s. Cls6 ERG154 | allfirefighter.com/hazmat/un/poisonous-solid-corrosive-inorganic-un-3290SMS / 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-solid-corrosive-inorganic-un-3290
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Frequently Asked Questions about UN 3290
UN 3290 is Poisonous solid, corrosive, inorganic, n.o.s., assigned to ERG Guide 154 and placarded as Toxic.
Yes. Toxic corrosive inorganic solid presents a serious toxic exposure hazard; avoid inhalation, ingestion, skin contact and contaminated runoff.
Yes, corrosive effects are possible. Avoid skin and eye contact and use chemical-resistant protection.
Use caution. May react with water to release toxic/corrosive fumes; consult specific material safety data
Dry chemical, sand, or appropriate agent for specific compound; avoid water unless material-specific data confirms safe.
Level A or B required; full chemical protective suit, SCBA mandatory; avoid all skin/eye contact due to severe corrosive and toxic properties.
ERG 154: Initial isolation 25m in all directions; protective action distance up to 800m downwind for large spills; immediate evacuation zone for fire.
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.