Abstract
Colloidal chemical processes in ethyl silicate gels and the crystallization of heat-treated silica are studied. The ethyl silicate/water ratio is shown to affect the optical properties of the filler. The effect of modifying additives on the refraction of light of heat-treated silica gel powders is studied. Controlled addition of Al2O3makes it possible to obtain powders with the required value of refraction index in the range of 1.490 – 1.510 to within 0.01.
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