☣️ UN 3541 • CLASS 4
Articles containing flammable solid, n.o.s.
Placard: Flammable Solid. 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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Quick details
UN 3541
Class: 4
Placard type: Flammable Solid
ERG: Guide 133 (check current ERG)
Isolation: ERG 133: Initial isolation 50m in all directions; protective action distance 100m for large spill; 300m downwind if fire involved
Chemical & Response Details
| 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 |
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
First actions (field-minded)
- 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 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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UN 3541 — Articles containing flammable solid, n.o HAZMAT 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 —
• 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 for at least 25 meters (75 feet) in all directions.
SOURCE: allfirefighter.com/hazmat/un/3541 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3541 Articles containing flammable solid, n.o.s. Cls4 ERG133 | allfirefighter.com/hazmat/un/3541SMS / 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/3541
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FAQ
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.
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 C minimum with fire-resistant clothing; SCBA required for fire conditions or enclosed spaces; gloves resistant to potential ignition sources
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 133 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.