☣️ UN 3466 • CLASS 6
UN 3466 — Metal carbonyls, solid, n.o.s.
Placard: Toxic. ERG Guide 151. 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 3466 Quick Details
UN 3466
Product name: Metal carbonyls, solid, n.o.s.
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill area at least 25-50m in all directions; if fire or large spill, consider initial evacuation 300m downwind
Common Hazards of UN 3466
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- 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
- Containers may explode when heated.
- Runoff may pollute waterways.
Chemical Identity & Physical Properties
| Also known as | Carbonyl metal complexesMetal carbonyl compoundsTransition metal carbonyls |
| Appearance | Solid crystals or powder, color varies by metal (often colorless to yellow or white). May have faint metallic or chemical odor. Stable at room temperature when pure. |
| Flash Point | Not applicable (solid, but may decompose with heat) |
| Boiling Point | Not applicable (decomposes or sublimes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | May react slowly with water; some metal carbonyls hydrolyze to produce carbon monoxide and metal hydroxides |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3466
Extinguishing Media
Dry chemical, CO2, dry sand. Avoid water spray directly on material.
PPE Requirements
⚠️ Level A recommended due to high toxicity; SCBA mandatory; impervious chemical protective clothing; avoid any skin contact
Isolation & Evacuation
ERG 151: isolate spill area at least 25-50m in all directions; if fire or large spill, consider initial evacuation 300m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 3466 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.
- 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 3466 — Metal carbonyls, solid, n.o.s.HAZMAT RADIO NOTE — UN 3466
Product: Metal carbonyls, solid, n.o.s.
Class 6 / Toxic / ERG 151
PPE: Level A recommended due to high toxicity; SCBA mandatory; impervious chemical protective clothing; avoid any skin contact
ISOLATION: ERG 151: isolate spill area at least 25-50m in all directions; if fire or large spill, consider initial evacuation 300m downwind
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 3466 — Metal carbonyls, solid, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Solid crystals or powder, color varies by metal (often colorless to yellow or white). May have faint metallic or chemical odor. Stable at room temperature when pure.
Water Reactivity: May react slowly with water; some metal carbonyls hydrolyze to produce carbon monoxide and metal hydroxides
Extinguishing: Dry chemical, CO2, dry sand. Avoid water spray directly on material.
PPE: Level A recommended due to high toxicity; SCBA mandatory; impervious chemical protective clothing; avoid any skin contact
Isolation: ERG 151: isolate spill area at least 25-50m in all directions; if fire or large spill, consider initial evacuation 300m downwind
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Avoid any skin contact.
• Fire may produce irritating, corrosive and/or toxic gases.
— 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.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/3466 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3466 Metal carbonyls, solid, n.o.s. Cls6 ERG151 | allfirefighter.com/hazmat/un/3466SMS / 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/3466
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Frequently Asked Questions about UN 3466
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. 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 Containers may explode when heated. Runoff may pollute waterways.
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 recommended due to high toxicity; SCBA mandatory; impervious chemical protective clothing; avoid any skin contact
Water reactivity: May react slowly with water; some metal carbonyls hydrolyze to produce carbon monoxide and metal hydroxides. Recommended extinguishing: Dry chemical, CO2, dry sand. Avoid water spray directly on material..
ERG Guide 151 recommendation: ERG 151: isolate spill area at least 25-50m in all directions; if fire or large spill, consider initial evacuation 300m downwind
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 151 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.