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Product Name: Metribuzin 97%
Chemical Name: 4-amino-6-tert-butyl-3-(methylthio)-1,2,4-triazin-5(4H)-one
CAS Number: 21087-64-9
Recommended Use: Herbicide for agricultural applications
Supplier Information: Contact local distributor or manufacturer for emergency numbers and inquiries
Emergency Contact: Local poison control or emergency response number
Classification: Acute oral toxicity (Category 3), Eye irritation (Category 2A), Acute aquatic toxicity (Category 1)
Signal Word: Danger
Hazard Pictograms: Skull and crossbones, Exclamation mark, Environment
Hazard Statements: May be fatal if swallowed. Causes serious eye irritation. Very toxic to aquatic life.
Precautionary Statements: Keep out of reach of children. Avoid breathing dust. Wear protective gloves, clothing, and eye protection. Prevent release to the environment.
Chemical Ingredient: Metribuzin
Concentration: 97% by weight
Other Ingredients: Inert ingredients up to 3% (identify only if classified as hazardous under local regulations)
Ingested: Rinse mouth, do not induce vomiting, seek medical attention immediately.
Inhalation: Move person to fresh air, keep at rest, seek medical advice if symptoms persist.
Skin Contact: Wash thoroughly with soap and water, remove contaminated clothing, seek medical help for persistent irritation.
Eye Contact: Rinse cautiously with plenty of water for 15-20 minutes, remove contact lenses, seek further medical attention.
Most Important Symptoms/Effects: Nausea, vomiting, skin and eye irritation, respiratory distress possible.
Advice for Physician: Treat symptomatically, monitor for seizures or respiratory complications.
Suitable Extinguishing Media: Foam, carbon dioxide, dry chemical powder, or water spray for cooling only.
Unsuitable Media: Avoid direct water stream, can spread material.
Specific Hazards: During combustion, emits toxic fumes including nitrogen oxides, sulfur oxides, carbon monoxide, and hydrogen cyanide.
Protective Equipment: Firefighters require full protective clothing, self-contained breathing apparatus.
Special Instructions: Evacuate area, prevent contaminated runoff from entering drains or watercourses.
Personal Precautions: Use personal protective equipment, avoid breathing dust, ensure adequate ventilation.
Environmental Precautions: Prevent runoff into soil, streams, or sewers. Notify authorities if hazardous material enters waterways.
Methods for Containment and Cleaning: Scoop up spills carefully with non-sparking tools, place in approved containers for disposal, avoid dust formation, ventilate area, prevent further leakage.
Decontamination: Wash area with detergent and water after collection.
Safe Handling: Wear appropriate PPE, avoid dust formation, handle in well-ventilated areas, wash hands thoroughly after use, do not eat, drink or smoke during use.
Storage: Store in tightly closed, labeled containers, away from food and feed, in a cool, dry, well-ventilated area. Protect from direct sunlight, moisture, and incompatible substances such as strong acids and oxidizing agents.
Incompatibilities: Store separate from bases, acids, strong oxidizers, or food products.
Exposure Limits: No occupational exposure limits established for Metribuzin by OSHA, NIOSH, or ACGIH. Minimize exposure with engineering controls and PPE.
Engineering Controls: Local exhaust ventilation, eyewash stations and safety showers in work area.
Personal Protective Equipment: Chemical-resistant gloves, protective clothing, goggles or face shield, and approved respirator if airborne dust is present.
Hygiene Measures: Wash hands and face after handling, change out of contaminated clothing before leaving work site.
Appearance: Off-white to beige crystalline powder
Odor: Slight to no detectable odor
Odor Threshold: Not available
pH: 4.0 to 6.0 (1% aqueous suspension)
Melting Point: 125-126°C
Boiling Point: Decomposes prior to boiling
Flash Point: Not combustible
Flammability: Not flammable or explosive
Vapor Pressure: <1 x 10-6 mm Hg (25°C)
Vapor Density: Not applicable
Bulk Density: ~1.5 g/cm3
Solubility: Soluble in water (1.2 g/L, 25°C), higher in organic solvents
Partition Coefficient (log Kow): 1.7
Decomposition Temperature: >200°C
Viscosity: Not applicable
Chemical Stability: Stable under recommended storage conditions
Possibility of Hazardous Reactions: Polymerization does not occur
Conditions to Avoid: High humidity, direct sunlight, elevated temperatures, sources of ignition
Materials to Avoid: Strong acids, strong bases, oxidizing agents
Hazardous Decomposition Products: Thermal decomposition can yield nitrogen oxides, sulfur oxides, carbon oxides, hydrogen cyanide
Acute Toxicity: Oral LD50 is approximately 1,100 mg/kg (rat), Dermal LD50 >2,000 mg/kg (rat), Inhalation LC50 >2.6 mg/L (rat)
Skin Corrosion/Irritation: Mild to moderate skin irritant
Serious Eye Damage/Irritation: Causes eye irritation, may cause tearing, redness
Respiratory or Skin Sensitization: Not a known sensitizer
Chronic Toxicity: Prolonged or repeated exposure may cause organ effects (liver, kidney)
Carcinogenicity: Not classified as carcinogenic by IARC, NTP, or OSHA
Mutagenicity: No evidence in standard tests
Reproductive Toxicity: No significant adverse effects observed in animal testing
Ecotoxicity: Highly toxic to aquatic invertebrates and non-target plants. LC50 (fish, 96 hr): 80 mg/L (Oncorhynchus mykiss). EC50 (daphnia, 48 hr): 49 mg/L. Toxic to algae at much lower concentrations.
Persistence and Degradability: Not readily biodegradable, persists in soil and water for weeks to months.
Bioaccumulative Potential: Low potential for bioaccumulation (log Kow ~1.7).
Mobility in Soil: Moderate to high mobility, especially under wet conditions.
Other Adverse Effects: Can harm aquatic ecosystems if used or disposed of improperly.
Product Disposal: Collect any remaining material and place in approved hazardous waste containers. Avoid disposal by landfilling, incinerate at an approved facility if possible.
Container Disposal: Triple rinse empty containers, then offer for recycling or dispose of as hazardous waste per local regulations.
Precautions: Avoid release to environment. Dispose of unused product, residues, and rinse waters in accordance with local, regional, and national legislation.
UN Number: 3077
Proper Shipping Name: Environmentally hazardous substance, solid, n.o.s. (contains Metribuzin)
Transport Hazard Class: 9 (Miscellaneous dangerous substances and articles)
Packing Group: III
Marine Pollutant: Classified as a marine pollutant
Special Precautions: Label containers clearly, prevent spillage, keep away from food and feed during transport.
Other Information: Consult national and international transport authorities for further details.
US EPA Status: Registered pesticide under FIFRA, restricted use in certain states.
TSCA Inventory: Listed
EU Regulations: Approved active substance, subject to specific labelling and use conditions under Regulation (EC) No 1107/2009.
OSHA HazCom: Classified as hazardous
Other Regulations: Subject to reporting requirements under CERCLA, SARA Title III (Section 313); not scheduled under international conventions.
Labeling Requirements: Product label must state hazard warnings, directions for safe use, and environmental precautions.
