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Evonik Offers Structurally Modified, Hydrophilic Silica to Improve Anti-fouling

Published on 2017-03-29. Author : SpecialChem

Evonik has announced that its structurally modified, hydrophilic AEROSIL® improves the anti-fouling properties and product life of anti-fouling coatings. Customers use the product in formulations with cuprous oxide (Cu2O) to take advantage of the resulting synergies.

Evonik’s VP 4200

Evoniks Hydrophilic Silica
Evonik Offers Structurally Modified, Hydrophilic
Silica to Improve Anti-fouling

  • VP 4200 is an active extender with cuprous oxide, 
  • Exhibits effective anti-fouling properties while lowering the amount of Cu2O needed in the coating formulation
  • In terms of product function, the structural modification process significantly increases bulk density, effectively reducing the thickening effect of AEROSIL® and making higher loading capacities possible
  • The high solids content help anchor the cuprous oxide and significant reinforcement and durability of the film also helps make the cuprous oxide available for longer periods of time
  • The product works in spray applications

Effective Anti-fouling Effects at Lower Cu2O Concentrations


When VP 4200 is added at concentrations exceeding 10 percent (relative to the total formulation), effective anti-fouling effects have been demonstrated at much lower concentrations of Cu2O (roughly 6 percent, also relative to the total formulation). In addition, a novel particle design based on hydrophobic, structurally modified VP 4200 is more effective in formulations than hydrophobically modified versions.

Structurally modified AEROSIL® grades were introduced over 10 years ago as a way of improving scratch resistance and mechanical durability of products in the coatings, adhesives, and sealants industries. The new developments are opening the door to novel applications to anti-fouling effects in maritime environments.

About Evonik

Evonik, the creative industrial group from Germany, is one of the world leaders in specialty chemicals. Profitable growth and a sustained increase in the value of the company form the heart of Evonik’s corporate strategy. Evonik benefits specifically from its innovative prowess and integrated technology platforms. Evonik is active in over 100 countries around the world with more than 35,000 employees. In fiscal 2016 the enterprise generated sales of around €12,7 billion and an operating profit (adjusted EBITDA) of about €2.165 billion.

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Source: Evonik
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