☣️ UN 3243 • CLASS 6
UN 3243 — Solids containing poisonous 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 3243 Quick Details
UN 3243
Product name: Solids containing poisonous 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. If fire involved, isolate 800m in all directions. Treat as highly toxic until identified.
Common Hazards of UN 3243
- 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 | Toxic solids containing poisonous liquidPoisonous solid mixture n.o.s.Class 6.1 solid-liquid mixture |
| Appearance | Variable appearance depending on specific material; typically a solid matrix impregnated or mixed with toxic liquid component. Color and odor vary widely based on constituents. |
| Flash Point | Variable depending on specific material; refer to SDS for exact composition |
| Boiling Point | Not applicable (solid mixture) |
| Vapor Density | Variable; toxic vapors may be heavier than air depending on liquid component |
| Water Reactivity | Variable; assume potential reaction until composition confirmed. Avoid water contact to prevent spread of toxic liquid. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3243
Extinguishing Media
Do not use water-based agents if water reactive; dry chemical, sand, or inert absorbents preferred until material identified
PPE Requirements
⚠️ Level A or B required; full encapsulation recommended. SCBA mandatory. Avoid all skin contact. Use chemical-resistant gloves rated for unknown toxics.
Isolation & Evacuation
ERG 151: Isolate spill 25-50m all directions. Evacuate immediate area. If fire involved, isolate 800m in all directions. Treat as highly toxic until identified.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 3243 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 3243 — Solids containing poisonous liquid, n.o.HAZMAT RADIO NOTE — UN 3243
Product: Solids containing poisonous liquid, n.o.s.
Class 6 / Toxic / ERG 151
PPE: Level A or B required; full encapsulation recommended. SCBA mandatory. Avoid all skin contact. Use chemical-resistant gloves rated for unknown toxics.
ISOLATION: ERG 151: Isolate spill 25-50m all directions. Evacuate immediate area. If fire involved, isolate 800m in all directions. Treat as highly toxic until identified.
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 3243 — Solids containing poisonous liquid, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Variable appearance depending on specific material; typically a solid matrix impregnated or mixed with toxic liquid component. Color and odor vary widely based on constituents.
Water Reactivity: Variable; assume potential reaction until composition confirmed. Avoid water contact to prevent spread of toxic liquid.
Extinguishing: Do not use water-based agents if water reactive; dry chemical, sand, or inert absorbents preferred until material identified
PPE: Level A or B required; full encapsulation recommended. SCBA mandatory. Avoid all skin contact. Use chemical-resistant gloves rated for unknown toxics.
Isolation: ERG 151: Isolate spill 25-50m all directions. Evacuate immediate area. If fire involved, isolate 800m in all directions. Treat as highly toxic until identified.
— 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/3243 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3243 Solids containing poisonous liquid, n.o.s. Cls6 ERG151 | allfirefighter.com/hazmat/un/3243SMS / 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/3243
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Frequently Asked Questions about UN 3243
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 encapsulation recommended. SCBA mandatory. Avoid all skin contact. Use chemical-resistant gloves rated for unknown toxics.
Water reactivity: Variable; assume potential reaction until composition confirmed. Avoid water contact to prevent spread of toxic liquid.. Recommended extinguishing: Do not use water-based agents if water reactive; dry chemical, sand, or inert absorbents preferred until material identified.
ERG Guide 151 recommendation: ERG 151: Isolate spill 25-50m all directions. Evacuate immediate area. If fire involved, isolate 800m in all directions. Treat as highly toxic until identified.
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.