Wettable Powder formulations are described as:

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Wettable powders are dry pesticide powders that form a suspension when mixed with water. Because they are powders, they’re dusty to handle and can cake if moisture or heat is involved. To keep the mixture uniform, you usually need to agitate the spray tank or mixing container continuously; otherwise the particles settle and can clog nozzles or create an uneven application. When not fully dispersed, the powder can leave a visible residue in the tank or on treated surfaces, and the fine particulates can be abrasive to spray equipment and fittings. They’re typically stored as dry powders in cool, dry conditions to prevent clumping. This combination of dusty handling, need for agitation, potential residue, and abrasiveness best matches how wettable powders behave, more so than descriptions that focus only on ease of measuring or that imply uses like seed coating.