Colloidal silica and its manufacturing method

Abstract

This invention provides a colloidal silica that, when used as an abrasive for grinding, does not easily leave silica particles on the grinding surface and can form a grinding surface with reduced surface roughness. The colloidal silica is formed by dispersing silica particles in a solvent, characterized in that the true specific gravity of the silica particles based on a liquid-phase displacement method is 1.60 or more and 2.20 or less, and the value of the composite parameter 1 calculated by a specific formula is 10 or more and 200 or less.