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Silicon Dioxide,
time2012/03/20
Silicon Dioxide, also known as silica. Is widely distributed in nature, such as quartz, quartz sand. White or colorless, high iron content is light yellow. Density from 2.2 to 2.66. Melting point 1670 ° C (tridymite); 1710 ° C (cristobalite). The boiling point of 2.23 thousand ℃, the relative dielectric constant of 3.9.Silicon Dioxide is not soluble in water and slightly soluble in acid, showed a particle state and molten alkali works. Used in making glass, water glass, pottery, enamels, refractories, ferro-silicon, sand, elemental silicon, etc..