Wettable powder (WP)
A wettable powder (WP) is a powder formulation that forms a suspension when mixed with water prior to spraying.
WP formulations consist of one or more active ingredients which are blended and mixed with inerts, diluents and surfactants.
Wetting agents are used to facilitate the suspension of the particles in water. A dispersing agent is added to prevent any flocculation of the suspension before it is applied.
Benefits
- Uniform distribution of active ingredients
- Exceptional residual control
- High loading of active ingredient is possible
- No storage sedimentation issues (due to being a powder)
- Reduced dermal hazards
Limitations
- High levels of dust can cause operator safety concerns during manufacture and application
- Difficult to mix in the spray tank
The Formulator's Toolbox (Full Version)
Products recommended for WP
The wetting agent aids in the incorporation of the wettable powder into the water phase at the time of dilution and functions at the solid/liquid interface. Wetting agents reduce the surface tension between the solid powder surface and the water surface, with the result that the powder wets and mixes with the water in the spray tank more easily.
Adinol™ OT-72
An electrolyte tolerant wetting agent which, due to its solid nature, shows strong performance in granule/powder based formulations. Ideally combined with Atlox Metasperse 550S.
Once the powder has been diluted in water and is ready for spraying (with the aid of the wetting agent), a dispersant is required to maintain the particles in suspension and prevent them from agglomerating.
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Atlox Metasperse™ 550S
A modified styrene acrylic polymeric aqueous dispersant in powder form. Particularly suited for highly loaded solid formulations such as WP or WDG, ideally combined with Multiwet MO-85P.
The Dispersol™ range are blended products with both dispersing and wetting properties. Please contact us to discuss if this range is available in your region.
Dispersol™ BB4
A high molecular weight with aromatic ring anionic surfactant which acts as a dispersant and wetting agent, giving better steric hindrance. This is available as Sodium salt.
Dispersol™ PSR 19
A high molecular weight with aromatic ring anionic surfactant which acts as a dispersant and wetting agent, giving better steric hindrance. This is available as Ammonium salt.
