Patent ID: 8883110

Claim:
A synthetic amorphous silica powder obtained by applying a spheroidizing treatment to a granulated silica powder, and by subsequently cleaning and drying it so that the synthetic amorphous silica powder has an average particle diameter D 50 of 10 to 2,000 μm; wherein the synthetic amorphous silica powder has: a quotient between 1.35 exclusive and 1.75 inclusive obtained by dividing a BET specific surface area of the powder by a theoretical specific surface area calculated from the average particle diameter D 50 ; a real density of 2.10 to 2.20 g/cm 3 ; an intra-particulate porosity of 0 to 0.05; a circularity between 0.50 inclusive and 0.75 inclusive; and a spheroidization ratio between 0.20 inclusive and 0.55 exclusive.