A thin coating of titanium dioxide on this material makes it superhydrophilic and allows for photocatalytic “self-cleaning.” This material is made to a uniform thickness over a molten tin (-5[1])bath in the Pilkington process, which produces this material’s “float” type. When manufacturing this material, soda and lime are added to lower the (10[1])melting temperature of its (10[1])main (-5[1])component to around (-5[1])1600 degrees Celsius. (10[1])A low coefficient of thermal expansion is characteristic of this material’s “borosilicate” (10[1])type. (10[1])Fused quartz is one (10[1])type of this amorphous material composed almost entirely of silicon dioxide. For 10 points, (10[1])the melting of sand produces (10[1])what material (10[1])sold by Pyrex? ■END■ (10[2])