Product Specification: Paclobutrazol 95% TC

Product Name: Paclobutrazol 95% TC
Chemical Name: (2RS,3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)pentan-3-ol
CAS Number: 76738-62-0
Molecular Formula: C₁₅H₂₀ClN₃O
Molecular Weight: 293.79 g/mol
Formulation Type: Technical Concentrate (TC)
Active Ingredient Content: ≥95.0% (by HPLC or GC)

Description

Paclobutrazol 95% TC is a triazole-based plant growth regulator widely used in agriculture, horticulture, and forestry. It acts by inhibiting the biosynthesis of gibberellins, plant hormones responsible for stem elongation, thus controlling vegetative growth. This results in shorter, more compact plants with improved stress tolerance, better root development, enhanced flowering, and increased fruit set.

This highly pure technical concentrate is the raw material for manufacturing various formulations such as wettable powders, soluble concentrates, and granules.

Physical and Chemical Properties

• Appearance: Off-white to light brown crystalline powder

• Odor: Mild characteristic odor

• Melting Point: 105–110°C

• Solubility:

  • Slightly soluble in water (<1 mg/L at 20°C)

  • Soluble in organic solvents such as methanol, ethanol, acetone, and dichloromethane

• Density: Approximately 1.2 g/cm³

• Stability: Stable under recommended storage conditions; sensitive to prolonged exposure to moisture and light

Specification Parameters

Mode of Action

Paclobutrazol inhibits the enzyme ent-kaurene oxidase, a key enzyme in the gibberellin biosynthesis pathway. By blocking gibberellin production, it suppresses stem elongation and promotes a compact plant habit. This modulation also enhances root growth, increases stress tolerance (drought, salinity), and improves flowering and fruit quality.

Applications

• Agriculture: Controls excessive vegetative growth in cereals, fruits, vegetables, and ornamental crops. Improves yield and quality by promoting flowering and fruit set.

• Horticulture: Used for growth regulation in ornamentals, turf, and nursery plants for compact and uniform growth.

• Forestry: Enhances root development and controls seedling height for better transplanting success.

• Formulations: Used as a raw material to produce wettable powders (WP), soluble concentrates (SL), and granules (GR).

Toxicological Profile

• Oral LD₅₀ (rat): >2000 mg/kg (low toxicity)

• Skin Irritation: Mild irritant

• Eye Irritation: Mild irritant

• Sensitization: Not a sensitizer

• Environmental Impact: Low toxicity to birds and mammals, biodegradable with moderate soil persistence. Low toxicity to bees.

Packaging and Storage

• Packaging: Supplied in moisture-proof polyethylene bags, fiber drums, or multi-layer paper bags with liners. Common pack sizes include 5 kg, 10 kg, and 25 kg.

• Storage Conditions: Store in a cool, dry, and well-ventilated area away from direct sunlight, moisture, and incompatible substances. Keep containers tightly closed.

• Shelf Life: Minimum 24 months when stored under recommended conditions.

Safety and Handling

• Use appropriate personal protective equipment (PPE), including gloves, goggles, and masks.

• Avoid inhalation, ingestion, and contact with skin or eyes.

• Follow local environmental and disposal regulations.

Conclusion

Paclobutrazol 95% TC is a high-quality plant growth regulator with a proven efficacy in managing vegetative growth, enhancing crop yield, and improving plant stress tolerance. Its high purity and stability make it an ideal technical concentrate for the production of various agricultural formulations.