☣️ UN 3142 • CLASS 6
UN 3142 — Disinfectant, liquid, 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 3142 Quick Details
UN 3142
Product name: Disinfectant, liquid, poisonous, n.o.s.
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: Isolate spill 50m in all directions; if tank/railcar involved in fire, isolate 800m in all directions and consider initial evacuation 800m
Common Hazards of UN 3142
- 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 | Disinfectant solutionLiquid disinfectantToxic disinfectant liquidPoisonous disinfectant preparation |
| Appearance | Variable appearance depending on formulation; typically clear to colored liquid with characteristic chemical odor. May contain various active ingredients such as quaternary ammonium compounds, phenolics, or other antimicrobial agents. |
| Flash Point | Variable; depends on formulation and carrier solvent - typically 23-93C (73-200F) for alcohol-based products, or Not applicable for water-based formulations |
| Boiling Point | Variable; typically 78-100C (172-212F) depending on solvent base |
| Vapor Density | Variable; typically 1.5-3.0 (heavier than air) for organic solvent-based products |
| Water Reactivity | Generally no significant reaction with water; however, dilution may release heat or vapors depending on active ingredients |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3142
Extinguishing Media
Alcohol-resistant foam for flammable products; CO2, dry chemical; water spray for cooling only
PPE Requirements
⚠️ Level B minimum; SCBA required; full chemical-resistant suit; neoprene or nitrile gloves; avoid all skin contact due to high toxicity
Isolation & Evacuation
ERG 151: Isolate spill 50m in all directions; if tank/railcar involved in fire, isolate 800m in all directions and consider initial evacuation 800m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 3142 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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UN 3142 — Disinfectant, liquid, poisonous, n.o.s.HAZMAT RADIO NOTE — UN 3142
Product: Disinfectant, liquid, poisonous, n.o.s.
Class 6 / Toxic / ERG 151
PPE: Level B minimum; SCBA required; full chemical-resistant suit; neoprene or nitrile gloves; avoid all skin contact due to high toxicity
ISOLATION: ERG 151: Isolate spill 50m in all directions; if tank/railcar involved in fire, isolate 800m in all directions and consider initial evacuation 800m
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 3142 — Disinfectant, liquid, poisonous, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Variable appearance depending on formulation; typically clear to colored liquid with characteristic chemical odor. May contain various active ingredients such as quaternary ammonium compounds, phenolics, or other antimicrobial agents.
Water Reactivity: Generally no significant reaction with water; however, dilution may release heat or vapors depending on active ingredients
Extinguishing: Alcohol-resistant foam for flammable products; CO2, dry chemical; water spray for cooling only
PPE: Level B minimum; SCBA required; full chemical-resistant suit; neoprene or nitrile gloves; avoid all skin contact due to high toxicity
Isolation: ERG 151: Isolate spill 50m in all directions; if tank/railcar involved in fire, isolate 800m in all directions and consider initial evacuation 800m
— 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/3142 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3142 Disinfectant, liquid, poisonous, n.o.s. Cls6 ERG151 | allfirefighter.com/hazmat/un/3142SMS / 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/3142
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Frequently Asked Questions about UN 3142
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; SCBA required; full chemical-resistant suit; neoprene or nitrile gloves; avoid all skin contact due to high toxicity
Water reactivity: Generally no significant reaction with water; however, dilution may release heat or vapors depending on active ingredients. Recommended extinguishing: Alcohol-resistant foam for flammable products; CO2, dry chemical; water spray for cooling only.
ERG Guide 151 recommendation: ERG 151: Isolate spill 50m in all directions; if tank/railcar involved in fire, isolate 800m in all directions and consider initial evacuation 800m
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.