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 in the Pilkington process, 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 around 1600 (10[1])degrees Celsius. (10[1]-5[1])A low coefficient of thermal expansion is characteristic of this material’s (-5[1])“borosilicate” type. Fused (10[1])quartz is one type of this (10[1]-5[1])amorphous material composed almost entirely of silicon dioxide. (-5[1])For 10 points, the melting of sand produces (10[1])what (10[1])material sold (10[1])by Pyrex? ■END■ (10[2])

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