☣️ UN 3147 • CLASS 8
UN 3147 — Dye intermediate, solid, corrosive, n.o.s.
Placard: Corrosive. ERG Guide 154. 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 3147 Quick Details
UN 3147
Product name: Dye intermediate, solid, corrosive, n.o.s.
DOT Class: 8
Placard type: Corrosive
ERG Guide: 154 (check current ERG)
Initial isolation: ERG 154: isolate spill 25m all directions; if fire or large spill, isolate 800m all directions and consider evacuation 800m downwind
Common Hazards of UN 3147
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Contact with molten substance may cause severe burns to skin and eyes.
- 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
- Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.).
- Corrosives in contact with metals may evolve flammable hydrogen gas.
Chemical Identity & Physical Properties
| Also known as | Dye intermediate solidCorrosive dye precursorIntermediate colorant solidDyestuff intermediate |
| Appearance | Variable appearance depending on specific intermediate; typically crystalline or powdered solid ranging from white to colored; may have chemical or aromatic odor; solid at room temperature. |
| Flash Point | Not applicable (non-flammable corrosive solid) |
| Boiling Point | Variable, depends on specific intermediate; typically decomposes before boiling |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | May react with water releasing heat; some intermediates may hydrolyze producing corrosive solutions |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3147
Extinguishing Media
Dry chemical, CO2, sand or earth; water spray may be used to flush spills if environmental conditions permit
PPE Requirements
⚠️ Level B minimum for solid handling; full face shield, chemical-resistant gloves, apron; SCBA required if dust or fumes present; avoid all skin and eye contact
Isolation & Evacuation
ERG 154: isolate spill 25m all directions; if fire or large spill, isolate 800m all directions and consider evacuation 800m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 154).
First Actions for a UN 3147 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.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- 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 3147 — Dye intermediate, solid, corrosive, n.o.HAZMAT RADIO NOTE — UN 3147
Product: Dye intermediate, solid, corrosive, n.o.s.
Class 8 / Corrosive / ERG 154
PPE: Level B minimum for solid handling; full face shield, chemical-resistant gloves, apron; SCBA required if dust or fumes present; avoid all skin and eye contact
ISOLATION: ERG 154: isolate spill 25m all directions; if fire or large spill, isolate 800m all directions and consider evacuation 800m downwind
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 3147 — Dye intermediate, solid, corrosive, n.o.s.
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Variable appearance depending on specific intermediate; typically crystalline or powdered solid ranging from white to colored; may have chemical or aromatic odor; solid at room temperature.
Water Reactivity: May react with water releasing heat; some intermediates may hydrolyze producing corrosive solutions
Extinguishing: Dry chemical, CO2, sand or earth; water spray may be used to flush spills if environmental conditions permit
PPE: Level B minimum for solid handling; full face shield, chemical-resistant gloves, apron; SCBA required if dust or fumes present; avoid all skin and eye contact
Isolation: ERG 154: isolate spill 25m all directions; if fire or large spill, isolate 800m all directions and consider evacuation 800m downwind
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• Contact with molten substance may cause severe burns to skin and eyes.
• Avoid any skin contact.
— 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.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/3147 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3147 Dye intermediate, solid, corrosive, n.o.s. Cls8 ERG154 | allfirefighter.com/hazmat/un/3147SMS / 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/3147
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Frequently Asked Questions about UN 3147
TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury Contact with molten substance may cause severe burns to skin and eyes. 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 Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Corrosives in contact with metals may evolve flammable hydrogen gas.
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 B minimum for solid handling; full face shield, chemical-resistant gloves, apron; SCBA required if dust or fumes present; avoid all skin and eye contact
Water reactivity: May react with water releasing heat; some intermediates may hydrolyze producing corrosive solutions. Recommended extinguishing: Dry chemical, CO2, sand or earth; water spray may be used to flush spills if environmental conditions permit.
ERG Guide 154 recommendation: ERG 154: isolate spill 25m all directions; if fire or large spill, isolate 800m all directions and consider evacuation 800m downwind
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 154 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.