☣️ UN 3280 • CLASS 6
UN 3280 — Organoarsenic compound, liquid, 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 3280 Quick Details
UN 3280
Product name: Organoarsenic compound, liquid, n.o.s.
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: Isolate spill 25-50m all directions; evacuate immediate area; consider evacuation 300m downwind if large spill; liquid and vapor highly toxic
Common Hazards of UN 3280
- 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 | Organoarsenic liquidOrganic arsenic compound liquidArsenical organic liquidArsenic organic derivative liquid |
| Appearance | Variable appearance depending on specific compound; typically colorless to pale yellow liquid with little to no odor, though some compounds may have characteristic odors. |
| Flash Point | Variable by specific compound; consult SDS for exact material |
| Boiling Point | Variable by specific compound; typically ranges from 100-300C depending on molecular structure |
| Vapor Density | Heavier than air (typically >1); vapors will settle in low areas |
| Water Reactivity | Generally stable in water but may hydrolyze slowly; some compounds may react with strong acids or bases |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3280
Extinguishing Media
Alcohol-resistant foam, dry chemical, CO2; water spray for cooling only
PPE Requirements
⚠️ Level A or B required; full-face SCBA mandatory; chemical-resistant suit with butyl rubber or Viton gloves; no skin contact permitted
Isolation & Evacuation
ERG 151: Isolate spill 25-50m all directions; evacuate immediate area; consider evacuation 300m downwind if large spill; liquid and vapor highly toxic
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 3280 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 3280 — Organoarsenic compound, liquid, n.o.s.HAZMAT RADIO NOTE — UN 3280
Product: Organoarsenic compound, liquid, n.o.s.
Class 6 / Toxic / ERG 151
PPE: Level A or B required; full-face SCBA mandatory; chemical-resistant suit with butyl rubber or Viton gloves; no skin contact permitted
ISOLATION: ERG 151: Isolate spill 25-50m all directions; evacuate immediate area; consider evacuation 300m downwind if large spill; liquid and vapor highly toxic
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 3280 — Organoarsenic compound, liquid, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Variable appearance depending on specific compound; typically colorless to pale yellow liquid with little to no odor, though some compounds may have characteristic odors.
Water Reactivity: Generally stable in water but may hydrolyze slowly; some compounds may react with strong acids or bases
Extinguishing: Alcohol-resistant foam, dry chemical, CO2; water spray for cooling only
PPE: Level A or B required; full-face SCBA mandatory; chemical-resistant suit with butyl rubber or Viton gloves; no skin contact permitted
Isolation: ERG 151: Isolate spill 25-50m all directions; evacuate immediate area; consider evacuation 300m downwind if large spill; liquid and vapor highly toxic
— 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/3280 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3280 Organoarsenic compound, liquid, n.o.s. Cls6 ERG151 | allfirefighter.com/hazmat/un/3280SMS / 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/3280
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Frequently Asked Questions about UN 3280
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 or B required; full-face SCBA mandatory; chemical-resistant suit with butyl rubber or Viton gloves; no skin contact permitted
Water reactivity: Generally stable in water but may hydrolyze slowly; some compounds may react with strong acids or bases. Recommended extinguishing: Alcohol-resistant foam, dry chemical, CO2; water spray for cooling only.
ERG Guide 151 recommendation: ERG 151: Isolate spill 25-50m all directions; evacuate immediate area; consider evacuation 300m downwind if large spill; liquid and vapor highly toxic
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.