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Chemical Name: Pendimethalin
Common Names: Stomp, Prowl
CAS Number: 40487-42-1
Intended Use: Selective herbicide for control of annual grasses and some broadleaf weeds in crops such as soybeans, cotton, tobacco, and vegetables
Manufacturer: Refer to the product label for supplier and emergency contact information
Product Formulation: Emulsifiable concentrate, suspension concentrate, granule
Hazard Classifications: Eye and skin irritant, suspected carcinogen (IARC 2B), toxic to aquatic life
Hazard Symbols: Exclamation mark, Environment
Signal Word: Warning
Routes of Exposure: Inhalation, ingestion, skin and eye contact
Primary Hazards: Can cause irritation of eyes, skin, and respiratory tract; possible allergic skin reaction; may damage aquatic organisms in surface water, persistence in soil
Pendimethalin Content: 30–40% (w/w) as active ingredient
Other Ingredients: Surfactants, solvent carriers, emulsifiers, inert fillers
Impurities: Minor stabilizers, by-products below reportable thresholds
Solvent Base: Often includes aromatic hydrocarbons, mineral oils in liquid formulations
CAS Registry Numbers: Pendimethalin 40487-42-1; hydrocarbon solvent 64742-94-5 (if applicable)
Inhalation: Move person to fresh air; keep airway open; seek medical attention if symptoms persist
Eye Contact: Rinse gently with water for at least fifteen minutes, remove contact lenses if equipped, consult ophthalmologist if irritation or redness remains
Skin Contact: Wash thoroughly with soap and water, remove contaminated clothing, rinse skin, consult physician if rash or irritation develops
Ingestion: Rinse mouth, give small amounts of water only if conscious, do not induce vomiting, contact poison control or physician
Special Precautions: Always take a container label or MSDS to provider; observe personal protection before giving first aid
Suitable Extinguishing Media: Foam, dry chemical powder, carbon dioxide, water spray (do not use direct water jet)
Fire Fighting Instructions: Wear self-contained breathing apparatus, full protective gear, remain upwind, avoid smoke
Hazardous Combustion Products: May produce nitrogen oxides, carbon oxides, hydrogen chloride, and toxic fumes
Explosion Risk: Containers may explode at high temperatures
Other Information: Cool fire-exposed containers with water; avoid runoff entering drains or water sources
Personal Protection: Use impermeable gloves, chemical protective clothing, goggles, and boots
Spill Cleanup: Control source of spill, absorb liquid with sand, soil, or inert material; collect solids with shovel; avoid dust and vapors
Environmental Precautions: Do not allow product to reach surface water or drains; prevent contamination of soil
Decontamination: Wash remnants with detergent and excessive water after removal
Waste Disposal: Package collected sweepings in drums labeled for hazardous waste, dispose at licensed facility
Handling: Store away from food, animal feed, children, and pets; use only in well-ventilated areas; avoid inhalation and direct skin or eye contact
Storage Conditions: Store in original, cool, dry, and well-ventilated place; keep container tightly closed; protect from extreme heat and cold
Storage Incompatibilities: Keep away from oxidizing agents, strong acids, and bases
Hygiene Measures: Wash hands before eating, drinking, or smoking; do not reuse empty containers
Special Instructions: Secure storage area to prevent unauthorized access and accidental spillage
Exposure Limits: No specific occupational exposure limit for pendimethalin, but minimize contact
Engineering Controls: Use local exhaust ventilation and containment where feasible
Personal Protection Equipment: Chemical-resistant gloves, safety goggles, long-sleeved clothing, NIOSH-approved respirator in situations of insufficient ventilation
Environmental Controls: Never flush into surface water, ensure spill containment systems in storage or handling areas
Workplace Practices: Provide eye wash stations and emergency showers at workplaces
Form: Yellow-orange to brownish liquid, crystalline solid, or granule depending on formulation
Odor: Distinct, mild aromatic or solvent-like
Melting Point: 56–57°C (pure pendimethalin)
Boiling Point: Decomposes before boiling
Vapor Pressure: 1.6 x 10-3 mPa at 20°C
Solubility: Very low in water (0.3 mg/L at 20°C), higher solubility in organic solvents
Density: 1.2 g/cm3 (emulsifiable concentrate)
Partition Coefficient (log Kow): 5.18 (octanol-water)
pH: Typically neutral to slightly acidic in aqueous suspension
Chemical Stability: Stable under recommended storage conditions
Incompatible Materials: Strong acids, strong bases, oxidizing agents
Decomposition Products: May degrade into toxic gases such as nitrogen oxides, hydrogen chloride, and carbon monoxide if heated
Reactivity: Not reactive at ambient temperatures
Polymerization: Does not undergo hazardous polymerization
Acute Toxicity: Oral LD50 in rats ranges from 1,000–5,000 mg/kg (low toxicity); dermal LD50 greater than 2,000 mg/kg
Chronic Exposure: May cause liver, kidney effects in prolonged exposure; listed as possible human carcinogen by some agencies
Local Effects: Causes mild to moderate skin and eye irritation
Sensitization: Reports of skin sensitization reactions from occupational exposure
Symptoms: Headache, nausea, skin rash, respiratory irritation, eye watering
Acute Toxicity to Aquatic Life: Highly toxic to fish and aquatic invertebrates (LC50 for rainbow trout: 0.138 mg/L)
Persistence and Degradability: Moderately persistent in soil (half-life: 30–90 days); low volatility, can bind to organic matter
Bioaccumulation: Potential for bioaccumulation in aquatic organisms (log Kow > 5)
Mobility in Soil: Moderately immobile, risk of off-site movement with runoff
Other Risks: Can disrupt aquatic ecosystems and non-target plants; avoid application near water sources
Waste Treatment Methods: Collect and incinerate under controlled conditions at licensed waste facility
Non-contaminated Packaging: Triple rinse and recycle where possible or dispose as hazardous waste
Contaminated Packaging: Handle as hazardous materials; never reuse containers
Environmental Risk: Never dump into natural watercourses, sewer systems, or open land
Regulations: Follow local and national regulations regarding agricultural chemicals and hazardous waste
UN Number: UN 3082
Proper Shipping Name: Environmentally hazardous substance, liquid, n.o.s. (contains pendimethalin)
Transport Hazard Class: Class 9 (Miscellaneous dangerous substances)
Packing Group: III
Environmental Hazard: Marine pollutant
Special Transport Precautions: Secure containers upright, away from incompatible substances, avoid impact or puncture, transport in compliance with ADR/RID/IMDG/IATA codes
Global Inventories: Listed on US EPA, EU REACH, China IECSC, Australian AICS
EPA Status: Registered pesticide in US, subject to restricted-use regulations
EU Classification: Regulated under Regulation (EC) No 1107/2009, labeled hazardous and for professional use only
Labeling: Risk phrases R40 (limited evidence of carcinogenic effect); Safety phrases S2, S24, S60
Worker Protection Standards: Follow all relevant worker safety and reentry regulations; periodic training on use and handling judged necessary by national authorities
