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Chemical Name: Pyrazosulfan
Synonyms: 1-(4,6-dimethoxypyrimidin-2-yl)-3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)sulfonylurea
CAS Number: 123343-16-8
Recommended Use: Herbicide used in agriculture for weed control, mainly in crops like rice and wheat.
Supplier Information: Details from manufacturer or distributor, typically including physical address, telephone, and emergency contact.
Emergency Contact Number: Local emergency response or poison control center.
Classification: Eye irritation, skin irritation, aquatic toxicity.
Label Elements: Signal word: Warning.
Hazard Statements: Causes mild to moderate eye irritation, may cause skin irritation, can be toxic to aquatic life with long-lasting effects.
Pictograms: Exclamation mark, environment.
Precautionary Statements: Avoid breathing dust, wear eye and skin protection, prevent release to the environment, wash thoroughly after handling.
Chemical Identity: Pyrazosulfan
Active Ingredient Concentration: 95% or as specified on product label.
Inert Ingredients: Fillers, carriers, and surfactants, depending on product formulation, typically making up the remainder; specifics vary with manufacturer.
Impurities: Manufacturing residues kept to regulatory limits, often less than 1%.
Component Exposure Limits: No established workplace limits for pyrazosulfan, but good industrial hygiene practice recommended.
Inhalation: Move affected person to fresh air immediately. If cough, inhalation discomfort, or symptoms persist, get medical attention.
Skin Contact: Remove contaminated clothing; wash skin thoroughly with soap and water. Seek medical advice for irritation or rash.
Eye Contact: Rinse eyes cautiously with running water for several minutes, lifting eyelids. Remove contact lenses if present. If eye irritation continues, consult healthcare.
Ingestion: Rinse mouth with water. Do not induce vomiting unless directed by medical personnel. Contact poison control or emergency services for guidance.
Medical Advice: Bring label or safety data sheet for reference.
Most Important Symptoms/Effects: Redness, itching, mild respiratory discomfort.
Suitable Extinguishing Media: Use foam, dry chemical powder, or carbon dioxide. Water spray for larger fires.
Unsuitable Media: High-pressure water jets may spread chemical.
Specific Hazards: Can emit toxic fumes like nitrogen oxides and sulfur oxides under combustion.
Protective Equipment for Firefighters: Wear self-contained breathing apparatus and protective gear.
Advice for Firefighters: Keep upwind, avoid runoff to waterways, use caution with containers exposed to extreme heat.
Explosion Data: Not considered an explosion hazard but fine dust can form combustive mixtures with air.
Personal Precautions: Evacuate unnecessary personnel, avoid dust formation, ventilate the area.
Protective Equipment: Use gloves, goggles, dust mask or respirator.
Environmental Precautions: Prevent product from entering water bodies, sewers, or soil to avoid environmental harm.
Containment and Clean Up: Sweep up and shovel spilled material using non-sparking tools, place in suitable containers for disposal. Wash spill site with water, collecting washings for proper handling.
Handling: Use in well-ventilated areas. Avoid contact with eyes, skin, or clothing. Limit dust generation and accumulation. Do not eat, drink, or smoke during handling.
Storage: Store in tightly closed containers in a cool, dry, well-ventilated place. Keep away from food and feed. Store away from incompatible substances such as acids and oxidizers.
Packaging Materials: Use corrosion-resistant, sealed containers. Keep product label visible at all times.
Industrial Hygiene: Wash hands and face before breaks, after handling, and at end of shift.
Engineering Controls: Provide local exhaust ventilation or general mechanical ventilation.
Personal Protective Equipment: Wear chemical-resistant gloves (nitrile or neoprene), long sleeves, laboratory coat or coveralls, closed footwear, and protective goggles.
Respiratory Protection: Use dust mask or approved respirator if dust exposure becomes airborne and exceeds recommended limits.
Eye/Face Protection: Safety glasses or goggles to avoid splashes.
Hand Protection: Impervious gloves.
Skin Protection: Long-sleeved clothing, avoid open skin exposure.
Work Practice Controls: Do not carry contaminated clothing home. Clean PPE regularly. Shower after work if significant exposure occurred.
Appearance: White to off-white powder
Odor: Mild or characteristic
Odor Threshold: Not determined
pH (1% solution): Around neutral
Melting Point/Freezing Point: 175–180 °C
Boiling Point/Range: Decomposes before boiling
Flash Point: Not applicable; non-volatile powder
Evaporation Rate: Not applicable
Flammability: Not flammable under normal use
Vapor Pressure: Low at ambient temperatures
Relative Density: 1.3 – 1.5 g/cm³
Solubility(ies): Low solubility in water, soluble in organic solvents
Partition Coefficient (log Kow): 2.5–3.0
Auto-Ignition Temperature: Not self-igniting
Decomposition Temperature: > 180°C
Viscosity: Not applicable for solid
Chemical Stability: Stable under recommended storage and handling conditions.
Reactivity: Not reactive with common materials under standard conditions.
Possible Hazardous Reactions: Strong acids, strong oxidizing agents may cause decomposition or unwanted chemical reactions.
Conditions to Avoid: Excessive heat, open flames, humid environments.
Incompatible Materials: Strong acids, strong bases, oxidizers.
Hazardous Decomposition Products: Nitrogen oxides, sulfur oxides, carbon oxides under fire conditions.
Routes of Exposure: Inhalation, skin contact, eye contact, ingestion.
Acute Toxicity: Low acute oral and dermal toxicity; LD50 (oral, rat) > 2,000 mg/kg
Skin Corrosion/Irritation: Mild irritant.
Serious Eye Damage/Irritation: Mild to moderate irritant.
Respiratory Sensitization: May cause mild respiratory symptoms if dust inhaled.
Skin Sensitization: Rare cases of skin sensitization.
Carcinogenicity, Mutagenicity, Reproductive Toxicity: Not classified based on available evidence.
Chronic Effects: No long-term data available in humans, low hazard profile based on animal studies.
Symptoms: Itching, redness, cough, gastrointestinal discomfort if ingested in large amounts.
Aquatic Toxicity: Toxic to aquatic organisms (fish and invertebrates), with risk of long-term adverse effects in aquatic environment.
Persistence and Degradability: Moderate persistence in soil and water, degrades by hydrolysis and microbial action.
Bioaccumulation Potential: Moderate tendency to bioaccumulate, partition coefficient (log Kow) suggests some potential for accumulation in aquatic organisms.
Mobility in Soil: Low to moderate, based on soil adsorption studies.
Other Adverse Effects: Do not apply near surface water during rainy season, avoid contamination of ditches, ponds, and any waterways used for irrigation or drinking.
Product Disposal: Incinerate or landfill in accordance with local, regional, and national regulations; never dispose of in waterways.
Container Disposal: Triple-rinse containers, puncture to prevent reuse, and offer for chemical recycling or approved landfill.
Waste Codes: As assigned by country or regional authority, usually considered hazardous chemical waste.
Special Precautions: Ensure all residues are cleaned up and disposed of properly, including any contaminated absorbents or cleaning materials.
UN Number: Not regulated for ground transport by most jurisdictions, check local restrictions.
Proper Shipping Name: Environmentally hazardous substance, solid, n.o.s. (Pyrazosulfan if required by authority)
Transport Hazard Class: Typically not classified as dangerous for transport; follow site-specific labeling if necessary.
Packing Group: Usually Group III (minor danger); check specifics for local regulations.
Environmental Hazards: Marine pollutant where applicable.
Special Precautions for User: Prevent container breakage, avoid transport with food, feed, or drinking water supplies.
Labelling Requirements: Product must display approved agricultural label with usage, safety, and hazard instructions.
Chemical Inventory Status: Included or regulated by most national inventories, including TSCA (USA), REACH (EU), DSL (Canada).
Occupational Exposure Limits: Not specifically listed by OSHA, NIOSH, or ACGIH; good practice recommends minimizing exposure.
Pesticide Regulations: Controlled as a pesticide under relevant acts (such as FIFRA, EPA in the US or equivalent international laws).
Environment: Regulated as an environmental hazard in some regions, restrictions on use near water bodies.
Additional Reporting: Subject to reporting under SARA Title III if used in regulated quantities, not listed as carcinogen by IARC, NTP.
