Abstract: The present invention relates to a silica powder for a cosmetic material, including: amorphous silica particles, in which the silica particles have an average circularity of 0.75 or more, and the silica powder satisfies at least one of the following conditions (1) to (3), (1) a degree of aggregation of 60% or more, (2) an angle of difference between an angle of repose and an angle of collapse of 15 degrees or less, or (3) a degree of dispersion of 50% or less.

Abstract: The present invention relates to a method for producing a spherical silica powder, the method including, firing a spherical and porous silica precursor in a state where particles of the silica precursor are in contact with each other, in which the silica precursor has a sodium concentration of 1 ppm by mass to 300 ppm by mass and assuming the sodium concentration as x (ppm by mass) and a heat treatment temperature as y (° C.), the silica precursor is subjected to the heat treatment at a temperature satisfying ?0.97x+1180<y<?0.97x+1310, or the silica precursor has a pore volume of 0.1 ml/g to 2.0 ml/g and a specific surface area of 200 m2/g to 1000 m2/g.

Abstract: The present invention relates to a spherical silica powder, having a median diameter d50 of 0.5 ?m to 20 ?m, and a product A×d50, which is a product of a specific surface area A (m2/g) and the median diameter d50 (?m), of 2.7 ?m·m2/g to 5.0 ?m·m2/g. The spherical silica powder may have a dielectric loss tangent of 0.0020 or less at a frequency of 1 GHz.

Abstract: The present invention relates to light-scattering silica particles having a light scattering property, the light-scattering silica particles including: a plurality of hollow portions each having a closed pore structure inside the particle, in which the light-scattering silica particles have a volume-based cumulative 50% particle diameter of 1 ?m to 500 ?m and an average circularity of 0.80 or more, and in use of the light-scattering silica particles, a reflectance A of a water cake containing 20 mg/cm2 of silica per measurement cross-sectional area at an ultraviolet wavelength of 310 nm is 30% or more.