2. Improve wear resistance and improve the surface finish of materials. Fumed silica particles are 100-1000 times smaller than SiO2. Adding them to epoxy resin is conducive to drawing into wires. Due to the high fluidity and small size effect of fumed silica, the surface of the material becomes denser and cleaner, the friction coefficient becomes smaller, and the high strength of the nanoparticles greatly enhances the wear resistance of the material.