Round 2: Tossup 17

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 bath in the Pilkington process, (10[1])which produces this material’s “float” type. When manufacturing this material, soda and lime are added to lower the melting temperature of its main component to (10[1])around 1600 degrees Celsius. A low coefficient of thermal expansion (10[1])is characteristic of this material’s “borosilicate” type. (10[2])Fused quartz (10[1])is one (10[1])type of this amorphous material composed almost entirely of silicon dioxide. (10[1])For 10 points, the melting of sand produces what (10[1])material sold by Pyrex? ■END■

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