A thin coating of titanium dioxide on this material makes it superhydrophilic and allows for photocatalytic “self-cleaning.” This material (-5[2])is made to a uniform thickness over a molten tin (-5[1])bath (-5[1])in the (10[2])Pilkington (-5[1])process, (10[4]-5[1])which produces (-5[1])this material’s “float” type. (10[2]-5[1])When manufacturing this material, (10[1])soda and lime (10[2]-5[1])are added to lower (10[2]-5[1])the (10[3])melting (10[2]-5[1])temperature (10[1]-5[3])of its (10[2])main (10[1]-5[1])component (10[1]-5[2])to (10[1])around (-5[1])1600 (10[2])degrees (10[2])Celsius. (10[4]-5[3])A low coefficient of thermal (10[1])expansion (10[1]-5[1])is characteristic (10[1])of this material’s (-5[2])“borosilicate” (10[2])type. (10[11])Fused (10[3])quartz (10[7])is one (10[3])type of this (10[2]-5[1])amorphous (10[3])material (10[2])composed (10[4])almost (10[1])entirely of silicon dioxide. (10[4]-5[2])For 10 points, (10[2])the melting of sand produces (10[4])what (10[3])material (10[6])sold (10[3])by Pyrex? (10[1])■END■ (10[13])