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, (-5[1])which produces this material’s “float” type. When manufacturing this material, soda and lime (10[1])are added to lower the melting temperature of its (10[1])main component (-5[1])to around 1600 (10[1])degrees Celsius. A low coefficient of thermal expansion is characteristic of this material’s “borosilicate” (10[1])type. (10[1])Fused quartz (10[1])is one type of this amorphous (10[1])material composed almost entirely of silicon dioxide. For 10 points, the melting of sand produces what material (10[1])sold by Pyrex? ■END■ (10[1])