Round 3: 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 (-5[1])in the Pilkington (-5[1])process, (10[1])which produces this material’s “float” type. (10[1])When manufacturing this material, soda and lime are added to lower the melting temperature of its main component to around 1600 degrees Celsius. (10[1])A low coefficient of thermal (10[1])expansion is characteristic of this material’s “borosilicate” type. (10[1])Fused quartz is one type of this amorphous material composed (10[1])almost entirely of silicon dioxide. (-5[1])For 10 points, the melting of sand produces what material sold (10[1])by Pyrex? ■END■ (10[1])

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