Round 4: 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 (10[1])Pilkington process, which produces this material’s “float” type. (10[1])When manufacturing this material, (10[1])soda and lime are added to lower the melting (10[1])temperature of its main component (10[1])to around 1600 degrees Celsius. A low coefficient of thermal expansion (-5[1])is characteristic of this material’s “borosilicate” type. Fused quartz is one type of this amorphous material composed almost (10[1])entirely of silicon dioxide. (10[1])For 10 points, the melting of sand produces what (10[1])material sold by Pyrex? ■END■ (10[1])

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