Cyhalofop-butyl 100G/L EW Technical Information

I. Basic Physicochemical Parameters

II. Solubility

• Water: Almost insoluble in water (about 0.7mg/L at 20℃)

• Organic Solvents: Readily soluble in most organic solvents

• Acetonitrile: 57.3% (w/w)

• Methanol: 37.3% (w/w)

• Acetone: 60.7% (w/w)

• Chloroform: 59.4% (w/w)

III. Formulation Technical Parameters (per HG/T 4815-2015 Standard)

1. Active Ingredient Content

• Cyhalofop-butyl: 100±5 g/L (range: 95-105 g/L)

• R-isomer ratio: ≥95% (S-isomer ≤5%)

2. Physical Properties

• Appearance: Milky white to pale blue homogeneous liquid

• Density: Approximately 0.989 g/cm³ (20℃)

• pH Value: 5.0-8.0

• Pourability:

• Residue after pouring: ≤5.0%

• Residue after washing: ≤1.0%

• Persistent Foam: ≤30 mL (after 1 minute)

• Emulsion Stability: Stable after 200-fold dilution

IV. Typical Formulation Composition

1. Oil Phase (about 15-20%)

• Cyhalofop-butyl technical (≥98% purity): 100 g/L

• Solvents (e.g., cyclohexanone, xylene): Appropriate amount

• Emulsifiers (e.g., alkylphenol polyoxyethylene ether): 5-8%

2. Aqueous Phase (about 80-85%)

• Deionized water: Balance amount

• Antifreeze agents (e.g., ethylene glycol): 3-5%

• Dispersants: 1-3%

• Thickeners (e.g., xanthan gum): 0.1-0.3%

• pH regulators: Appropriate amount (adjust to 5.0-8.0)

• Defoamers: Trace amount

V. Analytical Method (HPLC)

• Chromatographic column: C18 column (250mm×4.6mm, 5μm packing)

• Mobile phase: Methanol:water (pH adjusted to 3 with phosphoric acid) = 78:22

• Flow rate: 1.0 mL/min

• Detection wavelength: 254 nm

• Injection volume: 5μL

• Retention time: About 11.9 minutes

VI. Stability and Storage Conditions

1. Chemical Stability

• Stable in pH=4 buffer solution

• Slowly hydrolyzes at pH=7

• Rapidly decomposes at pH=1.2 or pH=9

2. Storage Conditions

• Sealed and stored in a dry, cool place (0-6℃)

• Keep away from heat sources and open flames

• Avoid direct sunlight

• Shelf life: 2 years (under standard storage conditions)

VII. Application Technical Key Points

• Dosage: 30-50 mL per mu (100G/L EW), mixed with 30-45 L of water

• Application Timing:

• Direct-seeded rice: At 3-5 leaf stage of rice, 2-4 leaf stage of weeds

• Transplanted rice: After seedling regreening, 2-3 leaf stage of weeds

• Application Techniques:

1. Drain field water before application to expose more than 2/3 of weed stems and leaves above water surface

2. Conduct uniform foliar spray

3. Irrigate 1-2 days after application, and maintain a 3-5 cm water layer for 5-7 days

VIII. Toxicity Information (Low Toxicity)

• Acute Oral LD₅₀: >5000 mg/kg (rat)

• Acute Dermal LD₅₀: >2000 mg/kg (rat)

• Effect on Rabbit Skin and Eyes: Non-irritating

• Effect on Guinea Pig Skin: Non-sensitizing

• Acceptable Daily Intake (ADI): 0.003 mg/kg bw

IX. Packaging Specifications

• Plastic drums: 1L, 5L, 10L, 20L, 25L

• Filling accuracy: Average deviation ≤±1%, single bottle deviation ≤±3%

• Containers must pass negative pressure test (-0.05MPa, no leakage for 5 minutes)

Technical Summary