A thin coating of titanium dioxide on this material makes it superhydrophilic and allows for photocatalytic “self-cleaning.” This material (-5[1])is made to a uniform thickness over a molten tin bath in the Pilkington process, which produces (-5[1])this material’s “float” type. When manufacturing this material, soda and lime (-5[1])are added to lower (-5[1])the melting temperature of its main component to around 1600 degrees Celsius. (-5[1])A low coefficient of thermal expansion is characteristic (10[1])of this material’s “borosilicate” type. (10[2])Fused quartz (10[3])is one type of this amorphous material composed (10[1])almost entirely of silicon dioxide. For 10 points, the melting of sand produces (10[1])what material (10[2])sold by Pyrex? ■END■ (10[2])