MEGASIL-ZX is Synthetic Sodium Magnesium Aluminum Silicate derived from coprecipitating Silicate under controlled condition. MEGASIL-ZX improves opacity and printability of paper on account of its high scattering coefficient by generating interface between air, MEGASIL-ZX particle and fibers of paper. The porous nature of MEGASIL-ZX particles tends to increase the bulk and rigidity of paper. Due to strong resistance to acid and acidic pH, MEGASIL-ZX permits problem free process even in an acid sizing process.