☣️ UN 3021 • CLASS 3
UN 3021 — Pesticide, liquid, flammable, toxic, n.o.s.
Placard: Flammable. ERG Guide 131. 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 3021 Quick Details
UN 3021
Product name: Pesticide, liquid, flammable, toxic, n.o.s.
DOT Class: 3
Placard type: Flammable
ERG Guide: 131 (check current ERG)
Initial isolation: ERG 131: Isolate spill area immediate 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m in all directions
Common Hazards of UN 3021
- TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
- Inhalation or contact with some of these materials will irritate or burn skin and eyes.
- Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
- Fire will produce irritating, corrosive and/or toxic gases.
- Vapors may cause dizziness or asphyxiation, especially when in closed or confined areas.
- Runoff from fire control or dilution water may cause environmental contamination.
- HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
- Vapors may form explosive mixtures with air.
Chemical Identity & Physical Properties
| Also known as | Pesticide liquid flammable toxic NOSToxic flammable pesticide solutionFlammable toxic pest control liquid |
| Appearance | Variable appearance depending on formulation; typically colored liquid (amber, yellow, or clear) with mild to pungent chemical odor, liquid at room temperature. |
| Flash Point | Below 23C (73F) - varies by formulation |
| Boiling Point | Varies widely by pesticide formulation and solvent system |
| Vapor Density | Typically greater than 1 (heavier than air) |
| Water Reactivity | Generally no violent reaction, but many formulations are immiscible with water |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3021
Extinguishing Media
Alcohol-resistant foam, dry chemical, CO2; water spray may be ineffective
PPE Requirements
⚠️ Level A or B required; SCBA mandatory; chemical-resistant suit, gloves, and boots essential due to high toxicity and skin absorption risk
Isolation & Evacuation
ERG 131: Isolate spill area immediate 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m in all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 131).
First Actions for a UN 3021 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.
- 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 3021 — Pesticide, liquid, flammable, toxic, n.oHAZMAT RADIO NOTE — UN 3021
Product: Pesticide, liquid, flammable, toxic, n.o.s.
Class 3 / Flammable / ERG 131
PPE: Level A or B required; SCBA mandatory; chemical-resistant suit, gloves, and boots essential due to high toxicity and skin absorption risk
ISOLATION: ERG 131: Isolate spill area immediate 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m in all directions
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 3021 — Pesticide, liquid, flammable, toxic, n.o.s.
Class: 3 | Placard: Flammable | ERG Guide: 131
Appearance: Variable appearance depending on formulation; typically colored liquid (amber, yellow, or clear) with mild to pungent chemical odor, liquid at room temperature.
Water Reactivity: Generally no violent reaction, but many formulations are immiscible with water
Extinguishing: Alcohol-resistant foam, dry chemical, CO2; water spray may be ineffective
PPE: Level A or B required; SCBA mandatory; chemical-resistant suit, gloves, and boots essential due to high toxicity and skin absorption risk
Isolation: ERG 131: Isolate spill area immediate 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m in all directions
— Key Hazards —
• TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
• Inhalation or contact with some of these materials will irritate or burn skin and eyes.
• Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
— 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/3021 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3021 Pesticide, liquid, flammable, toxic, n.o.s. Cls3 ERG131 | allfirefighter.com/hazmat/un/3021SMS / 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/3021
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Frequently Asked Questions about UN 3021
TOXIC; may be fatal if inhaled, ingested or absorbed through skin. Inhalation or contact with some of these materials will irritate or burn skin and eyes. Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears). Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or asphyxiation, especially when in closed or confined areas. Runoff from fire control or dilution water may cause environmental contamination. HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air.
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 A or B required; SCBA mandatory; chemical-resistant suit, gloves, and boots essential due to high toxicity and skin absorption risk
Water reactivity: Generally no violent reaction, but many formulations are immiscible with water. Recommended extinguishing: Alcohol-resistant foam, dry chemical, CO2; water spray may be ineffective.
ERG Guide 131 recommendation: ERG 131: Isolate spill area immediate 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider evacuation for 800m in all directions
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 131 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.