☣️ UN 1993 • CLASS 3
UN 1993 — Compounds, tree or weed killing, liquid (flammable)
Placard: Flammable. ERG Guide 128. 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 1993 Quick Details
UN 1993
Product name: Compounds, tree or weed killing, liquid (flammable)
DOT Class: 3
Placard type: Flammable
ERG Guide: 128 (check current ERG)
Initial isolation: ERG 128: Initial isolation 50m (150 ft) all directions; spill: 150m (500 ft) downwind; fire: evacuate 800m (0.5 mi) radius
Common Hazards of UN 1993
- HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
- Vapors may form explosive mixtures with air.
- Vapors may travel to source of ignition and flash back.
- Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
- Vapor explosion hazard indoors, outdoors or in sewers.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Runoff to sewer may create fire or explosion hazard.
- Containers may explode when heated.
Chemical Identity & Physical Properties
| Also known as | Herbicide solution (flammable)Weed killer liquid (flammable)Arboricide solutionTree killing compound (flammable)Pesticide liquid (flammable herbicide) |
| Appearance | Typically a clear to amber-colored liquid with varying odors depending on active ingredient and solvent base. May have petroleum-like, chemical, or aromatic odor due to flammable solvent carrier. |
| Flash Point | Variable, typically -18°C to 23°C (0°F to 73°F) depending on formulation |
| Boiling Point | Variable, typically 60°C to 150°C (140°F to 302°F) depending on solvent |
| Vapor Density | Typically >1 (heavier than air), varies with solvent composition |
| Water Reactivity | No significant reaction with water, though may form emulsions or separate layers depending on formulation |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1993
Extinguishing Media
Alcohol-resistant foam (AR-AFFF), dry chemical, CO2; regular AFFF may be ineffective depending on formulation
PPE Requirements
⚠️ Level B minimum recommended; SCBA and chemical-resistant suit; avoid skin contact due to pesticide toxicity and flammable solvent absorption
Isolation & Evacuation
ERG 128: Initial isolation 50m (150 ft) all directions; spill: 150m (500 ft) downwind; fire: evacuate 800m (0.5 mi) radius
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 128).
First Actions for a UN 1993 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 for at least 50 meters (150 feet) in all directions.
- Consider initial downwind evacuation for at least 300 meters (1000 feet).
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UN 1993 — Compounds, tree or weed killing, liquidHAZMAT RADIO NOTE — UN 1993
Product: Compounds, tree or weed killing, liquid (flammable)
Class 3 / Flammable / ERG 128
PPE: Level B minimum recommended; SCBA and chemical-resistant suit; avoid skin contact due to pesticide toxicity and flammable solvent absorption
ISOLATION: ERG 128: Initial isolation 50m (150 ft) all directions; spill: 150m (500 ft) downwind; fire: evacuate 800m (0.5 mi) radius
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 1993 — Compounds, tree or weed killing, liquid (flammable)
Class: 3 | Placard: Flammable | ERG Guide: 128
Appearance: Typically a clear to amber-colored liquid with varying odors depending on active ingredient and solvent base. May have petroleum-like, chemical, or aromatic odor due to flammable solvent carrier.
Water Reactivity: No significant reaction with water, though may form emulsions or separate layers depending on formulation
Extinguishing: Alcohol-resistant foam (AR-AFFF), dry chemical, CO2; regular AFFF may be ineffective depending on formulation
PPE: Level B minimum recommended; SCBA and chemical-resistant suit; avoid skin contact due to pesticide toxicity and flammable solvent absorption
Isolation: ERG 128: Initial isolation 50m (150 ft) all directions; spill: 150m (500 ft) downwind; fire: evacuate 800m (0.5 mi) radius
— Key Hazards —
• HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
• Vapors may form explosive mixtures with air.
• Vapors may travel to source of ignition and flash back.
— 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/1993 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1993 Compounds, tree or weed killing, liquid (flammable) Cls3 ERG128 | allfirefighter.com/hazmat/un/1993SMS / 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/1993
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Frequently Asked Questions about UN 1993
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas Vapor explosion hazard indoors, outdoors or in sewers. Those substances designated with a (P) may polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated.
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 recommended; SCBA and chemical-resistant suit; avoid skin contact due to pesticide toxicity and flammable solvent absorption
Water reactivity: No significant reaction with water, though may form emulsions or separate layers depending on formulation. Recommended extinguishing: Alcohol-resistant foam (AR-AFFF), dry chemical, CO2; regular AFFF may be ineffective depending on formulation.
ERG Guide 128 recommendation: ERG 128: Initial isolation 50m (150 ft) all directions; spill: 150m (500 ft) downwind; fire: evacuate 800m (0.5 mi) radius
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 128 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.