☣️ UN 3143 • CLASS 6
UN 3143 — Dye intermediate, solid, poisonous, 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 3143 Quick Details
UN 3143
Product name: Dye intermediate, solid, poisonous, n.o.s.
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill area minimum 25m all directions; if large spill isolate 50m; downwind evacuate as necessary
Common Hazards of UN 3143
- 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 | Dye intermediate solidToxic dye precursorPoisonous dyestuff intermediateDye manufacturing chemical |
| Appearance | Solid material varying in color depending on specific compound; may be crystalline powder or granular form; odor varies by specific intermediate compound. |
| Flash Point | Varies by specific compound; not uniformly applicable to n.o.s. entry |
| Boiling Point | Varies by specific compound; not uniformly applicable to n.o.s. entry |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Generally no significant reaction, but solubility varies by compound |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3143
Extinguishing Media
Dry chemical, CO2, or water spray appropriate for most dye intermediates
PPE Requirements
⚠️ Level B minimum required; full chemical protective suit with SCBA; avoid all skin contact; use chemical-resistant gloves and boots
Isolation & Evacuation
ERG 151: isolate spill area minimum 25m all directions; if large spill isolate 50m; downwind evacuate as necessary
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 3143 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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📋 Copy & Share Field Card
UN 3143 — Dye intermediate, solid, poisonous, n.o.HAZMAT RADIO NOTE — UN 3143
Product: Dye intermediate, solid, poisonous, n.o.s.
Class 6 / Toxic / ERG 151
PPE: Level B minimum required; full chemical protective suit with SCBA; avoid all skin contact; use chemical-resistant gloves and boots
ISOLATION: ERG 151: isolate spill area minimum 25m all directions; if large spill isolate 50m; downwind evacuate as necessary
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 3143 — Dye intermediate, solid, poisonous, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Solid material varying in color depending on specific compound; may be crystalline powder or granular form; odor varies by specific intermediate compound.
Water Reactivity: Generally no significant reaction, but solubility varies by compound
Extinguishing: Dry chemical, CO2, or water spray appropriate for most dye intermediates
PPE: Level B minimum required; full chemical protective suit with SCBA; avoid all skin contact; use chemical-resistant gloves and boots
Isolation: ERG 151: isolate spill area minimum 25m all directions; if large spill isolate 50m; downwind evacuate as necessary
— 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/3143 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3143 Dye intermediate, solid, poisonous, n.o.s. Cls6 ERG151 | allfirefighter.com/hazmat/un/3143SMS / 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/3143
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Frequently Asked Questions about UN 3143
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 B minimum required; full chemical protective suit with SCBA; avoid all skin contact; use chemical-resistant gloves and boots
Water reactivity: Generally no significant reaction, but solubility varies by compound. Recommended extinguishing: Dry chemical, CO2, or water spray appropriate for most dye intermediates.
ERG Guide 151 recommendation: ERG 151: isolate spill area minimum 25m all directions; if large spill isolate 50m; downwind evacuate as necessary
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.