☣️ UN 3541 • CLASS 4
UN 3541 — Articles containing flammable solid, n.o.s.
Placard: Flammable Solid. ERG Guide 133. 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.
UN 3541 is Articles containing flammable solid, n.o.s., assigned to ERG Guide 133. This entry should be verified with shipping papers, labels and the SDS before responders commit to close-range action.
Hazard overview: Articles containing flammable solid, n.o.s. can be ignited by heat, sparks, flame, friction or damaged contents. Vapors, dusts or burning articles may create flashback, re-ignition or explosion hazards.
Response guidance: Use ERG Guide 133, 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 3541 Quick Details
UN 3541
Product name: Articles containing flammable solid, n.o.s.
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 133 (check current ERG)
Initial isolation: ERG 133: Initial isolation 50m in all directions; protective action distance 100m for large spill; 300m downwind if fire involved
Common Hazards of UN 3541
- Flammable/combustible material.
- May be ignited by friction, heat, sparks or flames.
- Some may burn rapidly with flare-burning effect.
- Powders, dusts, shavings, borings, turnings or cuttings may explode or burn with explosive violence.
- Substance may be transported in a molten form at a temperature that may be above its flash point.
- May re-ignite after fire is extinguished.
- Fire may produce irritating and/or toxic gases.
- Contact may cause burns to skin and eyes.
Chemical Identity & Physical Properties
Manufactured articles or devices containing flammable solid materials in their composition. Physical appearance varies widely depending on the specific article but contains solid materials capable of ignition.
| Also known as | Articles containing flammable solid NOSFlammable solid articlesArticles with flammable solid compositionUN3541 flammable articles |
| Appearance | Manufactured articles or devices containing flammable solid materials in their composition. Physical appearance varies widely depending on the specific article but contains solid materials capable of ignition. |
| Flash Point | Not applicable (composite article with flammable solid component) |
| Boiling Point | Not applicable (manufactured article) |
| Vapor Density | Not applicable (solid article) |
| Water Reactivity | Depends on specific flammable solid component; generally no significant reaction with water for most common flammable solids |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3541
Extinguishing Media
Dry chemical, CO2, sand, or water spray depending on component; avoid methods that may damage article integrity
PPE Requirements
⚠️ Level C minimum with fire-resistant clothing; SCBA required for fire conditions or enclosed spaces; gloves resistant to potential ignition sources
Level C minimum with fire-resistant clothing; SCBA required for fire conditions or enclosed spaces; gloves resistant to potential ignition sources. Select final PPE using ERG guidance, SDS, monitoring and incident command.
Isolation & Evacuation
ERG 133: Initial isolation 50m in all directions; protective action distance 100m for large spill; 300m downwind if fire involved
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 133).
First Actions for a UN 3541 Incident
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Isolate spill or leak area for at least 25 meters (75 feet) in all directions.
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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📋 Copy & Share Field Card
UN 3541 — Articles containing flammable solid, n.oHAZMAT RADIO NOTE — UN 3541
Product: Articles containing flammable solid, n.o.s.
Class 4 / Flammable Solid / ERG 133
PPE: Level C minimum with fire-resistant clothing; SCBA required for fire conditions or enclosed spaces; gloves resistant to potential ignition sources
ISOLATION: ERG 133: Initial isolation 50m in all directions; protective action distance 100m for large spill; 300m downwind if fire involved
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 3541 — Articles containing flammable solid, n.o.s.
Class: 4 | Placard: Flammable Solid | ERG Guide: 133
Appearance: Manufactured articles or devices containing flammable solid materials in their composition. Physical appearance varies widely depending on the specific article but contains solid materials capable of ignition.
Water Reactivity: Depends on specific flammable solid component; generally no significant reaction with water for most common flammable solids
Extinguishing: Dry chemical, CO2, sand, or water spray depending on component; avoid methods that may damage article integrity
PPE: Level C minimum with fire-resistant clothing; SCBA required for fire conditions or enclosed spaces; gloves resistant to potential ignition sources
Isolation: ERG 133: Initial isolation 50m in all directions; protective action distance 100m for large spill; 300m downwind if fire involved
— Key Hazards —
• Flammable/combustible material.
• May be ignited by friction, heat, sparks or flames.
• Some may burn rapidly with flare-burning effect.
— First Actions —
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Isolate spill or leak area for at least 25 meters (75 feet) in all directions.
• Consider initial downwind evacuation for at least 100 meters (330 feet).
SOURCE: allfirefighter.com/hazmat/un/articles-containing-flammable-solid-un-3541 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3541 Articles containing flammable solid, n.o.s. Cls4 ERG133 | allfirefighter.com/hazmat/un/articles-containing-flammable-solid-un-3541SMS / 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-flammable-solid-un-3541
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Frequently Asked Questions about UN 3541
UN 3541 is Articles containing flammable solid, n.o.s., assigned to ERG Guide 133.
ERG Guide 133 applies for initial isolation, protective actions and first response guidance.
Articles containing flammable solid, n.
Level C minimum with fire-resistant clothing; SCBA required for fire conditions or enclosed spaces; gloves resistant to potential ignition sources.
ERG 133: Initial isolation 50m in all directions; protective action distance 100m for large spill; 300m downwind if fire involved.
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.