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Levasil CC401 is a neutral, aqueous dispersion of colloidal silica with a solids content of approximately 37% by weight. The silica dispersion is sterically stabilized and the amorphous silica particles carry a negative surface charge. The SiO2 particles are discrete, have a smooth spherical shape, and are present in a narrow particle size distribution. The particles were also surface modified with a reactive epoxy silane. The physical appearance of the dispersion is a translucent liquid that is slightly more viscous than water. Levasil CC401 is manufactured for worldwide distribution.