Wettable Powder (WP) Formulation

Refers to a dry, finely ground powder that contains active ingredients and is designed to be mixed with water before application. Unlike soluble powders, WP formulations do not dissolve in water—they form a suspension that must be agitated to remain evenly distributed.

Key Characteristics of WP Formulations:

• Powder-based: Appears like talc or chalk; lightweight and easy to store

• Water-suspendable: Forms a cloudy suspension, not a solution

• Requires constant agitation: Prevents settling during spraying

• No solvents: Safer for the environment and equipment

Advantages:

• Long shelf life and stable under various conditions

• Low risk of phytotoxicity

• Suitable for high-concentration active ingredients

• Minimal odor and flammability

Considerations:

• Can pose inhalation risks during mixing

• May be abrasive to spray equipment

• Requires moderate to strong agitation during application

• Leaves visible residue on crops if not properly diluted

Typical Components:

WP formulations are widely used in fungicides, insecticides, and biologicals, especially when a dry, stable format is preferred for transport and storage. They’re also common in seed treatments and soil applications where precision and residual effect matter.