☣️ UN 3546 • CLASS 6
UN 3546 — Articles containing toxic substance, n.o.s.
Placard: Toxic. ERG Guide 151. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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.
UN 3546 is Articles containing toxic substance, n.o.s., assigned to ERG Guide 151. This entry should be verified with shipping papers, labels and the SDS before responders commit to close-range action.
Hazard overview: Articles containing toxic substance, n.o.s. presents toxic exposure hazards by inhalation, ingestion or skin contact. Dust, vapor, smoke or contaminated runoff may create additional health and environmental risks.
Response guidance: Use ERG Guide 151, confirm the exact contents, isolate the area, keep unauthorized personnel away, control ignition sources and choose extinguishing agents based on the article or material involved.
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UN 3546 Quick Details
UN 3546
Product name: Articles containing toxic substance, n.o.s.
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill/leak area immediately for at least 25-50m in all directions; if fire or large spill, increase to 800m downwind evacuation
Common Hazards of UN 3546
- 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
Manufactured articles or devices containing toxic substances in various forms. Physical characteristics vary depending on the article design and enclosed toxic material.
| Also known as | Articles with toxic substancesToxic articles n.o.s.Articles containing poisonous substancePackaged toxic articles |
| Appearance | Manufactured articles or devices containing toxic substances in various forms. Physical characteristics vary depending on the article design and enclosed toxic material. |
| Flash Point | Not applicable (varies by article and contents) |
| Boiling Point | Not applicable (varies by article and contents) |
| Vapor Density | Not applicable (varies by article and contents) |
| Water Reactivity | Variable depending on enclosed toxic substance; assume reactive until confirmed otherwise |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3546
Extinguishing Media
Do not use water or foam without chemical assessment; dry chemical or CO2 for small fires
PPE Requirements
⚠️ Level A or B required; SCBA mandatory; full chemical protective suit; no skin contact permitted
Level A or B required; SCBA mandatory; full chemical protective suit; no skin contact permitted. Select final PPE using ERG guidance, SDS, monitoring and incident command.
Isolation & Evacuation
ERG 151: isolate spill/leak area immediately for at least 25-50m in all directions; if fire or large spill, increase to 800m downwind evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 3546 Incident
- 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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📋 Copy & Share Field Card
UN 3546 — Articles containing toxic substance, n.oHAZMAT RADIO NOTE — UN 3546
Product: Articles containing toxic substance, n.o.s.
Class 6 / Toxic / ERG 151
PPE: Level A or B required; SCBA mandatory; full chemical protective suit; no skin contact permitted
ISOLATION: ERG 151: isolate spill/leak area immediately for at least 25-50m in all directions; if fire or large spill, increase to 800m downwind evacuation
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 3546 — Articles containing toxic substance, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Manufactured articles or devices containing toxic substances in various forms. Physical characteristics vary depending on the article design and enclosed toxic material.
Water Reactivity: Variable depending on enclosed toxic substance; assume reactive until confirmed otherwise
Extinguishing: Do not use water or foam without chemical assessment; dry chemical or CO2 for small fires
PPE: Level A or B required; SCBA mandatory; full chemical protective suit; no skin contact permitted
Isolation: ERG 151: isolate spill/leak area immediately for at least 25-50m in all directions; if fire or large spill, increase to 800m downwind evacuation
— 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 —
• 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.
SOURCE: allfirefighter.com/hazmat/un/articles-containing-toxic-substance-un-3546 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3546 Articles containing toxic substance, n.o.s. Cls6 ERG151 | allfirefighter.com/hazmat/un/articles-containing-toxic-substance-un-3546SMS / 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/articles-containing-toxic-substance-un-3546
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Frequently Asked Questions about UN 3546
UN 3546 is Articles containing toxic substance, n.o.s., assigned to ERG Guide 151.
ERG Guide 151 applies for initial isolation, protective actions and first response guidance.
Articles containing toxic substance, n.
Level A or B required; SCBA mandatory; full chemical protective suit; no skin contact permitted.
ERG 151: isolate spill/leak area immediately for at least 25-50m in all directions; if fire or large spill, increase to 800m downwind evacuation.
Water compatibility depends on the specific contents and incident conditions. Check ERG 151, SDS and incident command before applying water.
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.