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.
UN 1993 is Compounds, tree or weed killing, liquid (flammable), a flammable herbicide/pesticide formulation assigned to ERG Guide 128. The solvent carrier and active ingredient determine vapor, toxicity and runoff hazards.
Hazard overview: FLAMMABLE liquid herbicide/pesticide formulation; vapors may ignite and flash back. Active ingredient and solvent carrier determine toxicity, odor, skin absorption and environmental impact. Vapors are typically heavier than air and may collect in low or confined areas.
Response guidance: For a UN 1993 incident, verify the product with shipping papers, container markings, SDS and ERG Guide 128. Establish incident command, isolate the area, stay upwind, control ignition or downwind hazards, cool exposed containers from a protected distance when appropriate and base entry decisions on monitoring and local SOP.
Firefighter training notes: Training for UN 1993 should emphasize fire behavior, exposure routes, air monitoring, PPE selection, evacuation, runoff control and ERG/SDS verification. Use ERG 128, SDS and local SOP.
Regulatory context: Compounds, tree or weed killing, liquid (flammable) is regulated as a hazardous material for transportation and emergency response purposes. Storage, workplace exposure, emergency planning, spill reporting and waste handling requirements vary by exact product, concentration, quantity and jurisdiction. Verify current requirements through shipping papers, SDS, container markings and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.
Storage & handling: Compounds, tree or weed killing, liquid (flammable) should be stored in approved flammable/toxic-liquid containers with ventilation, bonding/grounding where required, spill containment and separation from heat, ignition sources, oxidizers and incompatible materials.
UN 1993 Quick Details
Common Hazards of UN 1993
- FLAMMABLE liquid herbicide/pesticide formulation; vapors may ignite and flash back.
- Active ingredient and solvent carrier determine toxicity, odor, skin absorption and environmental impact.
- Vapors are typically heavier than air and may collect in low or confined areas.
- Runoff to sewers may create fire/explosion hazards and pesticide contamination.
- Fire may produce irritating, corrosive and/or toxic gases.
- Containers may rupture or explode when heated.
- Do not treat this entry as a single chemical; verify formulation from SDS and label.
Chemical Identity & Physical Properties
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.
| 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 |
Fireground Response Guidance — UN 1993
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for fire, heavy vapor or confined-space exposure. Wear chemical-resistant gloves, eye/face protection and protective clothing selected from SDS.
Isolation & Evacuation
First Actions for a UN 1993 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Avoid breathing vapors, gas, smoke, mist or dust and avoid skin or eye contact.
- Eliminate ignition sources if safe and keep vapors and runoff out of drains, sewers, basements and low areas.
- Do not touch damaged containers or spilled/released material unless properly trained and wearing appropriate protective equipment.
- Ventilate closed spaces before entering, but only if properly trained, equipped, monitored and authorized by incident command.
- Isolate the release or spill area and expand the perimeter for fire involvement, vapor accumulation, cylinder/tank heating or unknown product identity.
- Use ERG Guide 128, shipping papers, SDS, air monitoring and incident command for protective actions.
📋 Copy & Share Field Card
UN 1993 — Compounds, tree or weed killing, liquidUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.