The hydrophobic nature of fumed silica makes it useful in a wide range of applications. It can be used as a thickening agent in paints, coatings, and adhesives, where it helps to control the rheology or flow properties of the material. It can also be used as a reinforcing filler in elastomers and plastics, improving their mechanical properties and reducing shrinkage. In addition, hydrophobic fumed silica is used as an anti-caking agent in powders and as a matting agent in surface coatings.