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Product Name: Oxadiazon
Chemical Name: 3-(2,4-Dichloro-5-isopropoxyphenyl)-5-tert-butyl-1,3,4-oxadiazol-2(3H)-one
CAS Number: 19666-30-9
Synonyms: Ronstar, DCMU, Oxidiazon, Oxanilide Herbicide
Recommended Uses: Pre-emergence selective herbicide for controlling annual grasses and broadleaf weeds; typically used in turf, ornamentals, golf courses, public green spaces, industrial areas
Supplier: Details vary; information available on specific packaging
Emergency Contact: Refer to product label for 24-hour emergency response contacts
Hazard Class: Acute toxicity (oral, dermal, inhalation); Eye and skin irritation; Hazardous to aquatic life with long-lasting effects
Signal Word: Warning
GHS Pictograms: Exclamation mark, Environment
Hazard Statements: May cause skin irritation, Eye irritation, Harmful if swallowed or inhaled, Toxic to aquatic life
Precautionary Statements: Avoid release to the environment, Wear protective clothing, gloves, and eye protection, Wash thoroughly after handling, Do not eat, drink, or smoke when using this product
Chemical Substance: Oxadiazon
Percentage: 95% or higher (depending on formulation)
Impurities: May contain minor quantities of solvents, surfactants, or inert carriers, specific to formulation (consult product information)
Other Components: May include anti-caking agents, dyes, surfactants (proportion and identity provided by product supplier)
Inhalation: Remove individual from exposure area to fresh air. Monitor for respiratory symptoms; seek medical attention if symptoms persist
Skin Contact: Wash exposed skin thoroughly with soap and water; remove contaminated clothing, launder before reuse
Eye Contact: Flush eyes gently with plenty of water for at least 15 minutes, lifting eyelids; seek medical attention if irritation or discomfort continues
Ingestion: Rinse mouth, do not induce vomiting unless directed by medical personnel, offer water in small sips, obtain medical advice
Special Advice for Physician: Treat symptomatically; gastric lavage considered only if large quantities ingested and within short time frame
Suitable Extinguishing Media: Use dry chemical, carbon dioxide, foam, or water spray
Unsuitable Media: Avoid high-volume water jet, which may spread spilled substance
Unusual Fire Hazards: Combustion releases toxic gases such as carbon monoxide, nitrogen oxides, hydrogen chloride, phosgene
Protective Equipment: Self-contained breathing apparatus and full protective gear to avoid contact with fumes
Firefighting Instructions: Keep containers cool with water spray; prevent runoff to waterways
Personal Precautions: Ventilate area, avoid contact with skin, eyes, clothing; wear suitable protective equipment
Environmental Precautions: Prevent further leakage or spillage keeping product out of drains, waterways, soils, and sewers
Clean-up Methods: Contain material using earth, sand, or other non-combustible absorbent; collect in labeled containers for disposal following local regulations; decontaminate area using detergent solution and water
Disposal: Dispose of swept-up material and contaminated absorbent following all local, regional, and national waste laws
Handling Precautions: Keep packaging tightly closed; use with proper ventilation; avoid breathing dust or vapors; avoid skin, eye, and clothing contact; wash hands before breaks and after work
Hygiene Measures: Remove contaminated clothing and wash before reuse; do not eat, drink, or smoke in work areas
Storage Conditions: Store in original container, away from food, drinks, feeds, unauthorized persons, and incompatible materials; keep storage temperature stable, protect from direct sunlight, heat sources, and excessive moisture
Incompatible Materials: Strong oxidizers, acids, bases; avoid mixing with other chemicals unless specifically recommended
Exposure Limits: No established OSHA or ACGIH exposure limits for Oxadiazon; minimize exposure as much as possible
Engineering Controls: Use process enclosures, local exhaust ventilation, or other engineering methods to control exposure
Personal Protective Equipment: Protective gloves (nitrile, neoprene), chemical safety goggles, long-sleeved work clothing, suitable footwear
Respiratory Protection: Use approved particulate or vapor respirators if dust or spray mists exceed occupational exposure guidelines
Additional Protections: Wash thoroughly after handling; keep away from children and untrained persons
Appearance: Off-white to light brown crystalline powder
Odor: Slightly aromatic
Odor Threshold: Not determined
pH (1% solution): 5.1–7.0
Melting Point: 104–107 °C (219–224 °F)
Boiling Point: Decomposes before boiling
Flash Point: Not applicable (solid)
Flammability: Not highly flammable; will burn if involved in fire
Solubility (Water): 0.7 mg/L at room temperature, practically insoluble
Solubility (Other): Soluble in organic solvents (acetone, chloroform, xylene)
Partition Coefficient (log Kow): 4.23
Vapor Pressure: 1.6 x 10-6 mmHg at 25 °C
Relative Density: 1.17–1.20 g/cm3
Stability in Solution: Hydrolyzes slowly under normal environmental conditions
Chemical Stability: Stable during storage under recommended conditions; decomposes on exposure to high temperatures and light
Reactivity: Non-reactive under normal use and storage
Hazardous Reactions: May react with strong acids, bases, and oxidizing agents
Decomposition Products: Carbon oxides, nitrogen oxides, hydrogen chloride gas, phosgene
Conditions to Avoid: Excessive heat, open flames, direct sunlight, moisture ingress
Polymerization: Will not polymerize under standard conditions
Acute Toxicity: Oral LD50 (rat): 5,000 mg/kg; Dermal LD50 (rat): >2,000 mg/kg; Inhalation LC50 (rat, 4 hr): >3.6 mg/L
Skin Irritation: Mild to moderate irritant in some individuals
Eye Irritation: Mild irritant; may cause temporary discomfort, redness
Sensitization: No significant sensitizing potential reported
Chronic Effects: Animal studies indicate possible liver and kidney changes at prolonged high exposures
Carcinogenicity: Not classifiable as to human carcinogenicity, per major regulatory bodies
Mutagenicity: No evidence in standard test systems
Reproductive Toxicity: No significant reproductive toxicity observed in animal tests at occupational exposures
Ecotoxicity: Highly toxic to aquatic invertebrates and fish (LC50 rainbow trout: 0.33 mg/L; Daphnia magna: 0.52 mg/L); May cause long-term adverse effects in the aquatic environment
Persistence and Degradability: Moderately persistent; biodegradation is slow in aquatic and soil systems
Bioaccumulative Potential: High potential based on log Kow of 4.23
Mobility in Soil: Low leaching potential; binds strongly to soil particles
Other Adverse Effects: Harmful to non-target plants if misused; not considered harmful to birds or bees under recommended use
Waste Treatment Methods: Dispose by licensed chemical waste contractor; follow local, regional, national guidelines; do not flush to surface water or drains
Container Disposal: Triple-rinse, puncture and offer for recycling or disposal in approved hazardous waste landfill
Contaminated Packaging: Dispose as hazardous waste in accordance with local regulations
Decontamination: Use detergent and water for residues on surfaces
Destruction Methods: Controlled incineration; avoid open burning
UN Number: UN3077
Proper Shipping Name: Environmentally hazardous substance, solid, n.o.s. (Oxadiazon)
Transport Hazard Class: 9 (Miscellaneous dangerous substances)
Packing Group: III
Environmental Hazards: Marine pollutant
Special Precautions: Avoid release during transport; mark containers as hazardous to the environment; keep containers upright and secure
US EPA Status: Registered pesticide, subject to FIFRA labeling and use restrictions
EU Classification: Harmful (Xn), Dangerous for the environment (N) according to Directive 67/548/EEC
REACH Registration: Registrants and uses listed under relevant entry
OSHA Hazard Communication: Covered under Hazard Communication Standard (29 CFR 1910.1200)
WHMIS Classification (Canada): D2B - Toxic material causing other toxic effects
Other Regulation: Subject to local pesticide and hazardous material laws worldwide; not on domestic or international prohibited substances lists when used as directed
