☣️ UN 1993 • CLASS 3
Compounds, tree or weed killing, liquid (flammable)
Placard: Flammable. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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.
Advertisement
Quick details
UN 1993
Class: 3
Placard type: Flammable
ERG: Guide 128 (check current ERG)
Isolation: ERG 128: Initial isolation 50m (150 ft) all directions; spill: 150m (500 ft) downwind; fire: evacuate 800m (0.5 mi) radius
Chemical & Response Details
| 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 |
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
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.
- 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).
Advertisement
📋 Copy & Share
UN 1993 — Compounds, tree or weed killing, liquid HAZMAT 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
Advertisement
FAQ
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
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.